fbpx
Wikipedia

Kappa Cassiopeiae

April 08, 2023

Kappa Cassiopeiae (κ Cas, κ Cassiopeiae) is a star in the constellation Cassiopeia.

κ Cassiopeiae
Location of κ Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h 32m 59.991s[1]
Declination +62° 55′ 54.42″[1]
Apparent magnitude (V) 4.12 - 4.21[2]
Characteristics
Spectral type BC0.7 Ia[3]
Apparent magnitude (U) 3.50[4]
Apparent magnitude (B) 4.276[4]
Apparent magnitude (J) 4.141[4]
Apparent magnitude (H) 4.148[4]
Apparent magnitude (K) 4.013[4]
U−B color index −0.776[4]
B−V color index +0.0869[4]
J−H color index −0.0069[4]
J−K color index +0.128[4]
Variable type α Cyg[5]
Astrometry
Radial velocity (Rv)0.30[6] km/s
Proper motion (μ) RA: +3.65[1] mas/yr
Dec.: −2.07[1] mas/yr
Parallax (π)0.73 ± 0.17 mas[1]
Distanceapprox. 4,000 ly
(approx. 1,400 pc)
Absolute magnitude (MV)−7.1[7]
Details
Mass33[8] M☉
Radius39[7] R☉
Luminosity490,000[7] L☉
Surface gravity (log g)2.79[7] cgs
Temperature24,600[7] K
Rotational velocity (v sin i)58[7] km/s
Age4.5[9] Gyr
Other designations
15 Cassiopeiae, HR 130, HD 2905, BD+62°102, FK5 16, HIP 2599, SAO 11256, GC 645
Database references
SIMBADdata
Kappa Cassiopeiae and its bow shock. Spitzer infrared image (NASA/JPL-Caltech)

κ Cassiopeiae has an unusual spectrum that has anomalously weak nitrogen lines, taken as an actual nitrogen deficiency in the atmosphere. This is indicated by the modified letter C on the assumption that it is also carbon-rich, although this might not actually be the case.[8] It is also interpolated to BC0.7, being slightly hotter than a standard B1 star.[10][11]

κ Cassiopeiae is assumed to be a member of the Cassiopeia OB14 stellar association (Cas OB14) and treated as being at a distance of about 1,100 pc,[11] while its distance found from the Hipparcos parallax is about 1,400 parsecs.[1] Its Gaia parallaxes are somewhat uncertain due to the brightness of the star, but a modern determination of the distance to Cas OB14 is 880 pc.[12]

A light curve for Kappa Cassiopeiae, plotted from Hipparcos data[13]

It is classified as an Alpha Cygni type variable star and its brightness varies by a few hundredths of a magnitude. Periods of two hours,[14] 2.65 days,[15] and nine days[16] have been reported from observations at different times.

It is a runaway star, moving at around 2.5 million mph relative to its neighbors (1,100 kilometers per second). Its magnetic field and wind of particles creates a visible bow shock 4 light-years ahead of it, colliding with the diffuse, and usually invisible, interstellar gas and dust. This is about the same distance that Earth is from Proxima Centauri, the nearest star to the Sun.[17] The dimensions of the bow shock are vast: around 12 light-years long and 1.8 light-years wide.[18]

References

  1. ^ a b c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.Vizier catalog entry
  2. ^ "kappa Cas". Omternational Variable Star Index. AAVSO. Retrieved 2022-08-13.
  3. ^ Kraus, M.; Borges Fernandes, M.; Kubát, J. (2009). "Parameters of galactic early B supergiants. The influence of the wind on the interstellar extinction determination". Astronomy and Astrophysics. 499: 291. Bibcode:2009A&A...499..291K. doi:10.1051/0004-6361/200810319.
  4. ^ a b c d e f g h i Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  5. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  6. ^ Gontcharov, G. A. (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.
  7. ^ a b c d e f Simón-Díaz, S.; Aerts, C.; Urbaneja, M. A.; Camacho, I.; Antoci, V.; Fredslund Andersen, M.; Grundahl, F.; Pallé, P. L. (2018). "Low-frequency photospheric and wind variability in the early-B supergiant HD 2905". Astronomy and Astrophysics. 612: A40. arXiv:1711.08994. Bibcode:2018A&A...612A..40S. doi:10.1051/0004-6361/201732160. S2CID 20158464.
  8. ^ a b Searle, S. C.; Prinja, R. K.; Massa, D.; Ryans, R. (2008). "Quantitative studies of the optical and UV spectra of Galactic early B supergiants. I. Fundamental parameters". Astronomy and Astrophysics. 481 (3): 777. arXiv:0801.4289. Bibcode:2008A&A...481..777S. doi:10.1051/0004-6361:20077125. S2CID 1552752.
  9. ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. S2CID 118629873.
  10. ^ Walborn, Nolan R. (1971). "Some Spectroscopic Characteristics of the OB Stars: An Investigation of the Space Distribution of Certain OB Stars and the Reference Frame of the Classification". Astrophysical Journal Supplement. 23: 257. Bibcode:1971ApJS...23..257W. doi:10.1086/190239.
  11. ^ a b Walborn, Nolan R. (1971). "On the Existence of OB Stars with Anomalous Nitrogen and Carbon Spectra". Astrophysical Journal. 164: L67. Bibcode:1971ApJ...164L..67W. doi:10.1086/180693.
  12. ^ Melnik, A. M.; Dambis, A. K. (April 2020). "Internal motions in OB associations with Gaia DR2". Monthly Notices of the Royal Astronomical Society. 493 (2): 2339–2351. arXiv:2002.05044. Bibcode:2020MNRAS.493.2339M. doi:10.1093/mnras/staa454.
  13. ^ "Light Curve". Hipparcos ESA. ESA. Retrieved 17 February 2022.
  14. ^ Elst, E. W. (1979). "Spectroscopic and Photometric Variation of kappa Cas". Information Bulletin on Variable Stars. 1697: 1. Bibcode:1979IBVS.1697....1E.
  15. ^ Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45–59. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x. S2CID 10505995.
  16. ^ Percy, J. R. (1981). "Photometric Variability of kappa Cassiopeiae". Information Bulletin on Variable Stars. 1946: 1. Bibcode:1981IBVS.1946....1P.
  17. ^ Clavin, Whitney (21 February 2014). "The bow shock of Kappa Cassiopeiae, a massive, hot supergiant". Phys.org. Retrieved 6 December 2016.
  18. ^ Peri, C. S.; Benaglia, P.; Brookes, D. P.; Stevens, I. R.; Isequilla, N. L. (2012). "E-BOSS: An Extensive stellar BOw Shock Survey. I. Methods and first catalogue". Astronomy & Astrophysics. 538: A108. arXiv:1109.3689. Bibcode:2012A&A...538A.108P. doi:10.1051/0004-6361/201118116. S2CID 62840857.

April 08, 2023
kappa, cassiopeiae, cassiopeiae, star, constellation, cassiopeia, cassiopeiaelocation, cassiopeiae, circled, observation, dataepoch, j2000, equinox, j2000, 0constellation, cassiopeiaright, ascension, 991s, declination, apparent, magnitude, characteristicsspect. Kappa Cassiopeiae k Cas k Cassiopeiae is a star in the constellation Cassiopeia k CassiopeiaeLocation of k Cassiopeiae circled Observation dataEpoch J2000 0 Equinox J2000 0Constellation CassiopeiaRight ascension 00h 32m 59 991s 1 Declination 62 55 54 42 1 Apparent magnitude V 4 12 4 21 2 CharacteristicsSpectral type BC0 7 Ia 3 Apparent magnitude U 3 50 4 Apparent magnitude B 4 276 4 Apparent magnitude J 4 141 4 Apparent magnitude H 4 148 4 Apparent magnitude K 4 013 4 U B color index 0 776 4 B V color index 0 0869 4 J H color index 0 0069 4 J K color index 0 128 4 Variable type a Cyg 5 AstrometryRadial velocity Rv 0 30 6 km sProper motion m RA 3 65 1 mas yr Dec 2 07 1 mas yrParallax p 0 73 0 17 mas 1 Distanceapprox 4 000 ly approx 1 400 pc Absolute magnitude MV 7 1 7 DetailsMass33 8 M Radius39 7 R Luminosity490 000 7 L Surface gravity log g 2 79 7 cgsTemperature24 600 7 KRotational velocity v sin i 58 7 km sAge4 5 9 GyrOther designations15 Cassiopeiae HR 130 HD 2905 BD 62 102 FK5 16 HIP 2599 SAO 11256 GC 645Database referencesSIMBADdataKappa Cassiopeiae and its bow shock Spitzer infrared image NASA JPL Caltech k Cassiopeiae has an unusual spectrum that has anomalously weak nitrogen lines taken as an actual nitrogen deficiency in the atmosphere This is indicated by the modified letter C on the assumption that it is also carbon rich although this might not actually be the case 8 It is also interpolated to BC0 7 being slightly hotter than a standard B1 star 10 11 k Cassiopeiae is assumed to be a member of the Cassiopeia OB14 stellar association Cas OB14 and treated as being at a distance of about 1 100 pc 11 while its distance found from the Hipparcos parallax is about 1 400 parsecs 1 Its Gaia parallaxes are somewhat uncertain due to the brightness of the star but a modern determination of the distance to Cas OB14 is 880 pc 12 A light curve for Kappa Cassiopeiae plotted from Hipparcos data 13 It is classified as an Alpha Cygni type variable star and its brightness varies by a few hundredths of a magnitude Periods of two hours 14 2 65 days 15 and nine days 16 have been reported from observations at different times It is a runaway star moving at around 2 5 million mph relative to its neighbors 1 100 kilometers per second Its magnetic field and wind of particles creates a visible bow shock 4 light years ahead of it colliding with the diffuse and usually invisible interstellar gas and dust This is about the same distance that Earth is from Proxima Centauri the nearest star to the Sun 17 The dimensions of the bow shock are vast around 12 light years long and 1 8 light years wide 18 References Edit a b c d e f van Leeuwen F 2007 Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653 664 arXiv 0708 1752 Bibcode 2007A amp A 474 653V doi 10 1051 0004 6361 20078357 S2CID 18759600 Vizier catalog entry kappa Cas Omternational Variable Star Index AAVSO Retrieved 2022 08 13 Kraus M Borges Fernandes M Kubat J 2009 Parameters of galactic early B supergiants The influence of the wind on the interstellar extinction determination Astronomy and Astrophysics 499 291 Bibcode 2009A amp A 499 291K doi 10 1051 0004 6361 200810319 a b c d e f g h i Ducati J R 2002 VizieR Online Data Catalog Catalogue of Stellar Photometry in Johnson s 11 color system CDS ADC Collection of Electronic Catalogues 2237 Bibcode 2002yCat 2237 0D Samus N N Durlevich O V et al 2009 VizieR Online Data Catalog General Catalogue of Variable Stars Samus 2007 2013 VizieR On line Data Catalog B GCVS Originally Published in 2009yCat 102025S 1 Bibcode 2009yCat 102025S Gontcharov G A 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 a b c d e f Simon Diaz S Aerts C Urbaneja M A Camacho I Antoci V Fredslund Andersen M Grundahl F Palle P L 2018 Low frequency photospheric and wind variability in the early B supergiant HD 2905 Astronomy and Astrophysics 612 A40 arXiv 1711 08994 Bibcode 2018A amp A 612A 40S doi 10 1051 0004 6361 201732160 S2CID 20158464 a b Searle S C Prinja R K Massa D Ryans R 2008 Quantitative studies of the optical and UV spectra of Galactic early B supergiants I Fundamental parameters Astronomy and Astrophysics 481 3 777 arXiv 0801 4289 Bibcode 2008A amp A 481 777S doi 10 1051 0004 6361 20077125 S2CID 1552752 Tetzlaff N Neuhauser R Hohle M M January 2011 A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 1 190 200 arXiv 1007 4883 Bibcode 2011MNRAS 410 190T doi 10 1111 j 1365 2966 2010 17434 x S2CID 118629873 Walborn Nolan R 1971 Some Spectroscopic Characteristics of the OB Stars An Investigation of the Space Distribution of Certain OB Stars and the Reference Frame of the Classification Astrophysical Journal Supplement 23 257 Bibcode 1971ApJS 23 257W doi 10 1086 190239 a b Walborn Nolan R 1971 On the Existence of OB Stars with Anomalous Nitrogen and Carbon Spectra Astrophysical Journal 164 L67 Bibcode 1971ApJ 164L 67W doi 10 1086 180693 Melnik A M Dambis A K April 2020 Internal motions in OB associations with Gaia DR2 Monthly Notices of the Royal Astronomical Society 493 2 2339 2351 arXiv 2002 05044 Bibcode 2020MNRAS 493 2339M doi 10 1093 mnras staa454 Light Curve Hipparcos ESA ESA Retrieved 17 February 2022 Elst E W 1979 Spectroscopic and Photometric Variation of kappa Cas Information Bulletin on Variable Stars 1697 1 Bibcode 1979IBVS 1697 1E Koen Chris Eyer Laurent 2002 New periodic variables from the Hipparcos epoch photometry Monthly Notices of the Royal Astronomical Society 331 45 59 arXiv astro ph 0112194 Bibcode 2002MNRAS 331 45K doi 10 1046 j 1365 8711 2002 05150 x S2CID 10505995 Percy J R 1981 Photometric Variability of kappa Cassiopeiae Information Bulletin on Variable Stars 1946 1 Bibcode 1981IBVS 1946 1P Clavin Whitney 21 February 2014 The bow shock of Kappa Cassiopeiae a massive hot supergiant Phys org Retrieved 6 December 2016 Peri C S Benaglia P Brookes D P Stevens I R Isequilla N L 2012 E BOSS An Extensive stellar BOw Shock Survey I Methods and first catalogue Astronomy amp Astrophysics 538 A108 arXiv 1109 3689 Bibcode 2012A amp A 538A 108P doi 10 1051 0004 6361 201118116 S2CID 62840857 Retrieved from https en wikipedia org w index php title Kappa Cassiopeiae amp oldid 1141283294, 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.