fbpx
Wikipedia

HD 21699

May 10, 2024

HD 21699, also known as HR 1063 and V396 Persei, is a star about 580 light years from the Earth, in the constellation Perseus.[1] It is a 5th magnitude star, so it will be faintly visible to the naked eye of an observer far from city lights. This is a variable star, whose brightness varies slightly from 5.45 to 5.53 during its 2.4761 day rotation period.[2] It has a remarkable dipole magnetic field which is displaced from the star's center by 0.4 stellar radii, the poles of which appear close to each other on the stellar surface.[11] HD 21699 is a member of the Alpha Persei Cluster.[12]

HD 21699
Location of HD 21699 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 32m 08.60842s[1]
Declination +48° 01′ 24.5285″[1]
Apparent magnitude (V) 5.45 - 5.53[2]
Characteristics
Spectral type B8 III[3]
U−B color index −0.61[3]
B−V color index −0.17[3]
Variable type SX Arietis[2]
Astrometry
Radial velocity (Rv)2.6±0.9[4] km/s
Proper motion (μ) RA: 18.314±0.149[1] mas/yr
Dec.: −28.723±0.144[1] mas/yr
Parallax (π)5.6378 ± 0.1539 mas[1]
Distance580 ± 20 ly
(177 ± 5 pc)
Absolute magnitude (MV)−0.982[5]
Details
Mass6.46[5] M☉
Radius3.55[5] R☉
Luminosity708[5] L☉
Surface gravity (log g)4.15[5] cgs
Temperature16,000[5] K
Metallicity [Fe/H]+0.92[6] dex
Rotation2.49246±0.00035 d[7]
Rotational velocity (v sin i)35[8] km/s
Age12±6[9] Myr
Other designations
V396 Per, HR 1063, HIP 16470, SAO 38917[10]
Database references
SIMBADdata

Properties edit

 
A light curve for V396 Persei, plotted from TESS data[13]

In 1967, Robert Garrison noted that the U-B color of HD 21699 is significantly bluer (more negative) than the spectral type assigned to it (B8 III) would suggest.[14] Such a discrepancy suggests that the star is helium-weak.[15] The star's helium-weak nature was confirmed by William Morgan et al. in 1971.[3] HD 21699 also has an enhanced silicon abundance.[16]

John Winzer observed HD 21699 during 1971 - 1972 and discovered that it is a variable star. He found it varied by 0.03, 0.04 and 0.05 magnitudes in the visible, blue and ultraviolet photometric bands, respectively. Though he found that the brightness varied periodically, he was unable to unambiguously assign a period to it. It was the first helium-weak star to be found to vary in brightness periodically.[15] In 1974, HD 21699 was assigned the variable star designation V396 Persei.[17] In 1985, John Percy established that the star's variability period is 2.49246±0.00035 days.[7]

Magnetic field edit

In 1980, Werner Weiss deduced that HD 21699 has a magnetic field, based on a heuristic relationship between photometric colors and a star's surface magnetic field.[18] In 1984, Douglas Brown et al. announced that a magnetic field with a strength of about one kilogauss had been detected from observations of Zeeman splitting of spectral lines.[19] That same year, Brown et al. announced that International Ultraviolet Explorer data showed evidence of a stellar wind flowing from HD 21699, which was constrained to flow from the region of the star's magnetic poles. This "plume" of gas sweeps across the line of sight for an observer on the Earth, as the star rotates.[20]

In 2007, Yu. V. Glagolevskij and G. A. Chuntonov examined the extensive data which had been collected for HD 21699, and concluded that the star has a very peculiar magnetic field. In their model, the field is a dipole, but it is displaced by 0.4±0.1 stellar radii from the star's center. If the dipole were centered within the star, one would expect that the surface magnetic poles would be separated by 180° along a great circle which contained both poles. However, because the dipole is displaced from the star's center, the poles are separated by only 55°. Furthermore, the two magnetic poles lie almost exactly on the star's equator. Their estimate for the field's strength is 21.8±0.2 kilogauss at the poles.[11]

References edit

  1. ^ a b c d e f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. ^ a b c Samus', N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  3. ^ a b c d Morgan, W. W.; Hiltner, W. A.; Garrison, R. F. (April 1971). "The H-R diagram of the Alpha Persei cluster". Astronomical Journal. 76: 242–245. Bibcode:1971AJ.....76..242M. doi:10.1086/111111. Retrieved 5 March 2023.
  4. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169. Retrieved 6 March 2023.
  5. ^ a b c d e f Glagolevskij, Yu. V.; Leushin, V. V; Chuntonov, G. A.; Shulyak, D. (January 2006). "The atmospheres of helium-deficient Bp stars". Astronomy Letters. 32 (1): 54–68. Bibcode:2006AstL...32...54G. doi:10.1134/S1063773706010087. S2CID 120225963. Retrieved 5 March 2023.
  6. ^ Ghazaryan, S.; et al. (August 2019). "Statistical analysis of roAp, He-weak, and He-rich stars". Monthly Notices of the Royal Astronomical Society. 487 (4): 5922–5931. arXiv:1906.06984. Bibcode:2019MNRAS.487.5922G. doi:10.1093/mnras/stz1678. S2CID 189928323.
  7. ^ a b Percy, J. R. (September 1985). "The period of the helium-weak variable star HR 1063". Publications of the Astronomical Society of the Pacific. 97: 856–857. Bibcode:1985PASP...97..856P. doi:10.1086/131615. S2CID 120356941. Retrieved 5 March 2023.
  8. ^ Freire Ferrero, R.; et al. (February 2012). "High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database". The Astronomical Journal. 143 (2): 38. Bibcode:2012AJ....143...28F. doi:10.1088/0004-6256/143/2/28. 28.
  9. ^ Wolff, Sidney C. (December 1990). "Luminosities, Masses, and Ages of B-Type Stars". Astronomical Journal. 100: 1994. Bibcode:1990AJ....100.1994W. doi:10.1086/115654. Retrieved 6 March 2023.
  10. ^ "HD 21699 -- Rotating Variable". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-03-03.
  11. ^ a b Glagolevskij, Yu. V.; Chuntonov, G. A. (July 2007). "Composite model for the magnetic field of HD 21699". Astrophysics. 50 (3): 362–371. Bibcode:2007Ap.....50..362G. doi:10.1007/s10511-007-0035-5. S2CID 120563093. Retrieved 5 March 2023.
  12. ^ Molnar, M. R.; Stephens, T. C.; Mallama, A. D. (July 1978). "OAO 2 observations of the Alpha Persei cluster". Astrophysical Journal. 223: 185–191. Bibcode:1978ApJ...223..185M. doi:10.1086/156249. Retrieved 5 March 2023.
  13. ^ "MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved 4 March 2023.
  14. ^ Garrison, R. F. (March 1967). "Some Characteristics of the B and A Stars in the Upper Scorpius Complex". Astrophysical Journal. 147: 1003–1016. Bibcode:1967ApJ...147.1003G. doi:10.1086/149090. S2CID 121615150. Retrieved 5 March 2023.
  15. ^ a b Winzer, J. E. (January 1974). "Photometric variations of the helium-weak star HR 1063". Astronomical Journal. 79: 45–46. Bibcode:1974AJ.....79...45W. doi:10.1086/111528.
  16. ^ Molnar, Michael R. (July 1972). "The Helium-Weak Stars". Astrophysical Journal. 175: 453. Bibcode:1972ApJ...175..453M. doi:10.1086/151570. Retrieved 5 March 2023.
  17. ^ Kukarkin, B. V.; Kholopov, P. N.; Kukarkina, N. P.; Perova, N. B. (January 1975). "60th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 961: 1. Bibcode:1975IBVS..961....1K. Retrieved 5 March 2023.
  18. ^ Weiss, W. W. (September 1980). "Is There a Magnetic Field - Period Relation for the Hotter Ap Stars?" (PDF). Information Bulletin on Variable Stars. 1841: 1. Bibcode:1980IBVS.1841....1W. Retrieved 6 March 2023.
  19. ^ Brown, D. N.; Shore, S. N.; Barker, P. K.; Sonneborn, G. (December 1984). "Magnetospheres and winds in the helium weak stars: observations of C IV in upper main sequence CP stars". NASA Conference Publication. 2349: 487–490. Bibcode:1984NASCP2349..487B. Retrieved 6 March 2023.
  20. ^ Brown, D. N.; Shore, S. N.; Bolton, C. T.; Hulbert, S. J.; Sonneborn, G. (December 1984). "Ultraviolet and optical spectroscopy and polarimetry of the helium weak star HD 21699: evidence for a magnetically controlled stellar wind". NASA Conference Publication. 2349: 483. Bibcode:1984NASCP2349..483B. Retrieved 6 March 2023.

Further reading edit

  • Monier, Richard (June 2023), "The Behavior of Bp He-weak Stars in the Far UV-Paper VI: HD 21699", Research Notes of the AAS, 7 (6): 117, Bibcode:2023RNAAS...7..117M, doi:10.3847/2515-5172/acdb62, 117.
  • Leushin, V. V.; et al. (January 2011), "Distribution of helium and silicon in the atmospheres of Bp stars HD168785 and HD21699", Astrophysical Bulletin, 66 (1): 64–71, Bibcode:2011AstBu..66...64L, doi:10.1134/S1990341311010056, S2CID 123603063.
  • Shavrina, A. V.; et al. (January 2010), "Spots structure and stratification of helium and silicon in the atmosphere of He-weak star HD 21699", Monthly Notices of the Royal Astronomical Society, 401 (3): 1882–1888, arXiv:0911.5588, Bibcode:2010MNRAS.401.1882S, doi:10.1111/j.1365-2966.2009.15765.x, S2CID 118441738.
  • Stateva, I. K. (April 1995), "Surface Mapping in the CP4 Star HD 21699", Astrophysics and Space Science, 226 (2): 329–336, Bibcode:1995Ap&SS.226..329S, doi:10.1007/BF00627377, S2CID 121935154.
  • Hubrig, S.; Mathys, G. (1994), Balona, Luis A.; Henrichs, Huib F.; Le Contel, Jean Michel (eds.), "Mass loss, magnetic field and chemical inhomogeneities in the He-weak star HD 21699", Pulsation; rotation; and mass loss in early-type stars: proceedings of the 162nd symposium of the International Astronomical Union held in Antibes; Juan-les-Pins; France; October 5-8; 1993, International Astronomical Union. Symposium no. 162, vol. 162, Dordrecht: Kluwer Academic Publishers, p. 167, Bibcode:1994IAUS..162..167H.
  • Shore, Steven N.; et al. (January 1990), "The Discovery of Magnetically Controlled Circumstellar Matter in the Helium-weak Stars HD 5737 and HD 79158", Astrophysical Journal, 348: 242, Bibcode:1990ApJ...348..242S, doi:10.1086/168233.
  • Brown, D. N.; et al. (July 1985), "The magnetically controled stellar wind of HD 21699", Astronomical Journal, 90: 1354–1362, Bibcode:1985AJ.....90.1354B, doi:10.1086/113842.
  • Mallama, A. D.; Molnar, M. R. (June 1974), "UV Observations of the Helium-Weak Star HD 21699.", Bulletin of the American Astronomical Society, 6: 307, Bibcode:1974BAAS....6R.307M.

May 10, 2024
21699, also, known, 1063, v396, persei, star, about, light, years, from, earth, constellation, perseus, magnitude, star, will, faintly, visible, naked, observer, from, city, lights, this, variable, star, whose, brightness, varies, slightly, from, during, 4761,. HD 21699 also known as HR 1063 and V396 Persei is a star about 580 light years from the Earth in the constellation Perseus 1 It is a 5th magnitude star so it will be faintly visible to the naked eye of an observer far from city lights This is a variable star whose brightness varies slightly from 5 45 to 5 53 during its 2 4761 day rotation period 2 It has a remarkable dipole magnetic field which is displaced from the star s center by 0 4 stellar radii the poles of which appear close to each other on the stellar surface 11 HD 21699 is a member of the Alpha Persei Cluster 12 HD 21699Location of HD 21699 circled Observation dataEpoch J2000 0 Equinox J2000 0 Constellation Perseus Right ascension 03h 32m 08 60842s 1 Declination 48 01 24 5285 1 Apparent magnitude V 5 45 5 53 2 Characteristics Spectral type B8 III 3 U B color index 0 61 3 B V color index 0 17 3 Variable type SX Arietis 2 AstrometryRadial velocity Rv 2 6 0 9 4 km sProper motion m RA 18 314 0 149 1 mas yr Dec 28 723 0 144 1 mas yrParallax p 5 6378 0 1539 mas 1 Distance580 20 ly 177 5 pc Absolute magnitude MV 0 982 5 DetailsMass6 46 5 M Radius3 55 5 R Luminosity708 5 L Surface gravity log g 4 15 5 cgsTemperature16 000 5 KMetallicity Fe H 0 92 6 dexRotation2 49246 0 00035 d 7 Rotational velocity v sin i 35 8 km sAge12 6 9 Myr Other designationsV396 Per HR 1063 HIP 16470 SAO 38917 10 Database referencesSIMBADdata Contents 1 Properties 2 Magnetic field 3 References 4 Further readingProperties edit nbsp A light curve for V396 Persei plotted from TESS data 13 In 1967 Robert Garrison noted that the U B color of HD 21699 is significantly bluer more negative than the spectral type assigned to it B8 III would suggest 14 Such a discrepancy suggests that the star is helium weak 15 The star s helium weak nature was confirmed by William Morgan et al in 1971 3 HD 21699 also has an enhanced silicon abundance 16 John Winzer observed HD 21699 during 1971 1972 and discovered that it is a variable star He found it varied by 0 03 0 04 and 0 05 magnitudes in the visible blue and ultraviolet photometric bands respectively Though he found that the brightness varied periodically he was unable to unambiguously assign a period to it It was the first helium weak star to be found to vary in brightness periodically 15 In 1974 HD 21699 was assigned the variable star designation V396 Persei 17 In 1985 John Percy established that the star s variability period is 2 49246 0 00035 days 7 Magnetic field editIn 1980 Werner Weiss deduced that HD 21699 has a magnetic field based on a heuristic relationship between photometric colors and a star s surface magnetic field 18 In 1984 Douglas Brown et al announced that a magnetic field with a strength of about one kilogauss had been detected from observations of Zeeman splitting of spectral lines 19 That same year Brown et al announced that International Ultraviolet Explorer data showed evidence of a stellar wind flowing from HD 21699 which was constrained to flow from the region of the star s magnetic poles This plume of gas sweeps across the line of sight for an observer on the Earth as the star rotates 20 In 2007 Yu V Glagolevskij and G A Chuntonov examined the extensive data which had been collected for HD 21699 and concluded that the star has a very peculiar magnetic field In their model the field is a dipole but it is displaced by 0 4 0 1 stellar radii from the star s center If the dipole were centered within the star one would expect that the surface magnetic poles would be separated by 180 along a great circle which contained both poles However because the dipole is displaced from the star s center the poles are separated by only 55 Furthermore the two magnetic poles lie almost exactly on the star s equator Their estimate for the field s strength is 21 8 0 2 kilogauss at the poles 11 References edit a b c d e f Vallenari A et al Gaia collaboration 2023 Gaia Data Release 3 Summary of the content and survey properties Astronomy and Astrophysics 674 A1 arXiv 2208 00211 Bibcode 2023A amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b c Samus N N Kazarovets E V Durlevich O V Kireeva N N Pastukhova E N 2017 General catalogue of variable stars Version GCVS 5 1 Astronomy Reports 61 1 80 Bibcode 2017ARep 61 80S doi 10 1134 S1063772917010085 S2CID 125853869 a b c d Morgan W W Hiltner W A Garrison R F April 1971 The H R diagram of the Alpha Persei cluster Astronomical Journal 76 242 245 Bibcode 1971AJ 76 242M doi 10 1086 111111 Retrieved 5 March 2023 Gontcharov G A November 2006 Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system Astronomy Letters 32 11 759 771 arXiv 1606 08053 Bibcode 2006AstL 32 759G doi 10 1134 S1063773706110065 S2CID 119231169 Retrieved 6 March 2023 a b c d e f Glagolevskij Yu V Leushin V V Chuntonov G A Shulyak D January 2006 The atmospheres of helium deficient Bp stars Astronomy Letters 32 1 54 68 Bibcode 2006AstL 32 54G doi 10 1134 S1063773706010087 S2CID 120225963 Retrieved 5 March 2023 Ghazaryan S et al August 2019 Statistical analysis of roAp He weak and He rich stars Monthly Notices of the Royal Astronomical Society 487 4 5922 5931 arXiv 1906 06984 Bibcode 2019MNRAS 487 5922G doi 10 1093 mnras stz1678 S2CID 189928323 a b Percy J R September 1985 The period of the helium weak variable star HR 1063 Publications of the Astronomical Society of the Pacific 97 856 857 Bibcode 1985PASP 97 856P doi 10 1086 131615 S2CID 120356941 Retrieved 5 March 2023 Freire Ferrero R et al February 2012 High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database The Astronomical Journal 143 2 38 Bibcode 2012AJ 143 28F doi 10 1088 0004 6256 143 2 28 28 Wolff Sidney C December 1990 Luminosities Masses and Ages of B Type Stars Astronomical Journal 100 1994 Bibcode 1990AJ 100 1994W doi 10 1086 115654 Retrieved 6 March 2023 HD 21699 Rotating Variable SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2023 03 03 a b Glagolevskij Yu V Chuntonov G A July 2007 Composite model for the magnetic field of HD 21699 Astrophysics 50 3 362 371 Bibcode 2007Ap 50 362G doi 10 1007 s10511 007 0035 5 S2CID 120563093 Retrieved 5 March 2023 Molnar M R Stephens T C Mallama A D July 1978 OAO 2 observations of the Alpha Persei cluster Astrophysical Journal 223 185 191 Bibcode 1978ApJ 223 185M doi 10 1086 156249 Retrieved 5 March 2023 MAST Barbara A Mikulski Archive for Space Telescopes Space Telescope Science Institute Retrieved 4 March 2023 Garrison R F March 1967 Some Characteristics of the B and A Stars in the Upper Scorpius Complex Astrophysical Journal 147 1003 1016 Bibcode 1967ApJ 147 1003G doi 10 1086 149090 S2CID 121615150 Retrieved 5 March 2023 a b Winzer J E January 1974 Photometric variations of the helium weak star HR 1063 Astronomical Journal 79 45 46 Bibcode 1974AJ 79 45W doi 10 1086 111528 Molnar Michael R July 1972 The Helium Weak Stars Astrophysical Journal 175 453 Bibcode 1972ApJ 175 453M doi 10 1086 151570 Retrieved 5 March 2023 Kukarkin B V Kholopov P N Kukarkina N P Perova N B January 1975 60th Name List of Variable Stars PDF Information Bulletin on Variable Stars 961 1 Bibcode 1975IBVS 961 1K Retrieved 5 March 2023 Weiss W W September 1980 Is There a Magnetic Field Period Relation for the Hotter Ap Stars PDF Information Bulletin on Variable Stars 1841 1 Bibcode 1980IBVS 1841 1W Retrieved 6 March 2023 Brown D N Shore S N Barker P K Sonneborn G December 1984 Magnetospheres and winds in the helium weak stars observations of C IV in upper main sequence CP stars NASA Conference Publication 2349 487 490 Bibcode 1984NASCP2349 487B Retrieved 6 March 2023 Brown D N Shore S N Bolton C T Hulbert S J Sonneborn G December 1984 Ultraviolet and optical spectroscopy and polarimetry of the helium weak star HD 21699 evidence for a magnetically controlled stellar wind NASA Conference Publication 2349 483 Bibcode 1984NASCP2349 483B Retrieved 6 March 2023 Further reading editMonier Richard June 2023 The Behavior of Bp He weak Stars in the Far UV Paper VI HD 21699 Research Notes of the AAS 7 6 117 Bibcode 2023RNAAS 7 117M doi 10 3847 2515 5172 acdb62 117 Leushin V V et al January 2011 Distribution of helium and silicon in the atmospheres of Bp stars HD168785 and HD21699 Astrophysical Bulletin 66 1 64 71 Bibcode 2011AstBu 66 64L doi 10 1134 S1990341311010056 S2CID 123603063 Shavrina A V et al January 2010 Spots structure and stratification of helium and silicon in the atmosphere of He weak star HD 21699 Monthly Notices of the Royal Astronomical Society 401 3 1882 1888 arXiv 0911 5588 Bibcode 2010MNRAS 401 1882S doi 10 1111 j 1365 2966 2009 15765 x S2CID 118441738 Stateva I K April 1995 Surface Mapping in the CP4 Star HD 21699 Astrophysics and Space Science 226 2 329 336 Bibcode 1995Ap amp SS 226 329S doi 10 1007 BF00627377 S2CID 121935154 Hubrig S Mathys G 1994 Balona Luis A Henrichs Huib F Le Contel Jean Michel eds Mass loss magnetic field and chemical inhomogeneities in the He weak star HD 21699 Pulsation rotation and mass loss in early type stars proceedings of the 162nd symposium of the International Astronomical Union held in Antibes Juan les Pins France October 5 8 1993 International Astronomical Union Symposium no 162 vol 162 Dordrecht Kluwer Academic Publishers p 167 Bibcode 1994IAUS 162 167H Shore Steven N et al January 1990 The Discovery of Magnetically Controlled Circumstellar Matter in the Helium weak Stars HD 5737 and HD 79158 Astrophysical Journal 348 242 Bibcode 1990ApJ 348 242S doi 10 1086 168233 Brown D N et al July 1985 The magnetically controled stellar wind of HD 21699 Astronomical Journal 90 1354 1362 Bibcode 1985AJ 90 1354B doi 10 1086 113842 Mallama A D Molnar M R June 1974 UV Observations of the Helium Weak Star HD 21699 Bulletin of the American Astronomical Society 6 307 Bibcode 1974BAAS 6R 307M Retrieved from https en wikipedia org w index php title HD 21699 amp oldid 1191853298, wikipedia, wiki, book, books, library,

article

, read, download, free, free download, mp3, video, mp4, 3gp, jpg, jpeg, gif, png, picture, music, song, movie, book, game, games.