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V692 Coronae Australis

April 12, 2024

V692 Coronae Australis (HD 166596; HR 6804; 3 G. CrA), or simply V692 CrA, is a whitish-blue hued variable star located in the southern constellation Corona Australis. It has a maximum apparent magnitude of 5.46,[2] making it faintly visible to the naked eye. The object is located relatively far at a distance of approximately 1,900 light years based on Gaia DR3 parallax measurements,[1] but it is approaching the Solar System with a fairly constrained heliocentric radial velocity of −15.3 km/s.[8] At its current distance, V692 CrA's brightness is heavily diminished by 0.46 magnitudes due to extinction due to interstellar dust.[18] Its absolute magnitude depends on the source: Westin (1985) gave a value of −6.44[9] while the extended Hipparcos catalogue gave a value of −2.26.[10]

V692 Coronae Australis
Location of V692 CrA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 18h 13m 12.69843s[1]
Declination −41° 20′ 09.9972″[1]
Apparent magnitude (V) 5.46[2] (5.46 - 5.51)[3]
Characteristics
Spectral type B2 III[4] or B1.5 IIIp[5]
B−V color index −0.17[6]
Variable type SX Arietis[7]
Astrometry
Radial velocity (Rv)−15.3±2.8[8] km/s
Proper motion (μ) RA: −2.050 mas/yr[1]
Dec.: −6.210 mas/yr[1]
Parallax (π)1.7423 ± 0.0977 mas[1]
Distance1,900 ± 100 ly
(570 ± 30 pc)
Absolute magnitude (MV)−6.44[9] or −2.26[10]
Details
Mass7.35±0.48[11] M☉
Radius12.6±0.7[12] R☉
Luminosity (bolometric)4,181[11] L☉
Surface gravity (log g)3.52+0.33
−0.14[1] cgs
Temperature17,061+1,474
−1,357[13] K
Rotational velocity (v sin i)212±9[14] km/s
Age31.6±5.1[15] Myr
Other designations
3 G. Corona Australis[16], V692 CrA, CD−41°12534, CPD−41°8620, GC 24824, HD 166596, HIP 89290, HR 6804, SAO 228815[17]
Database references
SIMBADdata
A light curve for V692 Coronae Australis, plotted from Hipparcos data[19]

Astronomers Carlos and Mercedes Jaschek along with a colleague listed HD 166596 as a Be star in 1964.[20] However, its status as an Ap star was not observed until 1979 by astronomers N. Vogt and A.M Faundez.[21] A year later, HD 166596 was observed to be variable and it had a period of 1.67 days.[22] In 1981, its variability was confirmed and it was given the variable star designation V692 Coronae Australis—the 692nd variable star in Corona Australis.[23] The star might have a shorter period of 49.8 hours.[7]

V692 CrA has a stellar classification of B2 III[4] or B1.5 IIIp,[5] both indicating that it is a slightly evolved B-type giant star. The second classification indicates that V692 CrA has peculiarities in its spectrum. It has 7.35 times the mass of the Sun[11] and 12.6 times the Sun's radius.[12] It radiates at a bolometric luminosity 4,181 times that of the Sun[11] from its photosphere at an effective temperature of 17,061 K.[13] V692 CrA is estimated to be 31.6 million years old[15] and it spins rapidly with a projected rotational velocity of 212 km/s.[14]

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 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
  3. ^ "VSX : Detail for V0692 CrA". www.aavso.org.
  4. ^ a b Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars: Declinations −53° to −40°. Vol. 2. Bibcode:1978mcts.book.....H.
  5. ^ a b Rountree, Janet; Sonneborn, George (March 1991). "Criteria for the spectral classification of B stars in the ultraviolet". The Astrophysical Journal. 369: 515. Bibcode:1991ApJ...369..515R. doi:10.1086/169781. eISSN 1538-4357. ISSN 0004-637X. S2CID 118640556.
  6. ^ Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J. S2CID 118307502.
  7. ^ a b Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. eISSN 1562-6881. ISSN 1063-7729. S2CID 125853869.
  8. ^ a b 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. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
  9. ^ a b Westin, T. N. G. (April 1985). "The local system of early type stars. Spatial extent and kinematics". Astronomy and Astrophysics Supplement Series. 60: 99–134. Bibcode:1985A&AS...60...99W. ISSN 0365-0138. S2CID 119020376.
  10. ^ a b Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
  11. ^ a b c d Hohle, M.M.; Neuhäuser, R.; Schutz, B.F. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349–360. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. eISSN 1521-3994. ISSN 0004-6337. S2CID 111387483.
  12. ^ a b Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
  13. ^ a b Gulati, R. K.; Malagnini, M. L.; Morossi, C. (October 1989). "Empirical temperature calibrations for early-type stars". Astronomy and Astrophysics Supplement Series. 80: 73–88. Bibcode:1989A&AS...80...73G. ISSN 0365-0138. S2CID 115777506.
  14. ^ a b Brown, A. G. A.; Verschueren, W. (March 1997). "High S/N Echelle spectroscopy in young stellar groups. II. Rotational velocities of early-type stars in SCO OB2". Astronomy & Astrophysics. 319: 811–838. arXiv:astro-ph/9608089. Bibcode:1997A&A...319..811B. ISSN 0004-6361. S2CID 118925453.
  15. ^ a b Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (October 12, 2010). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410 (1). Oxford University Press (OUP): 190–200. arXiv:1007.4883. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x. ISSN 0035-8711. S2CID 118629873.
  16. ^ Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
  17. ^ "V* V692 CrA". SIMBAD. Centre de données astronomiques de Strasbourg.
  18. ^ Gontcharov, George A.; Mosenkov, Aleksandr V. (28 September 2017). "Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars". Monthly Notices of the Royal Astronomical Society. 472 (4): 3805–3820. arXiv:1709.01160. Bibcode:2017MNRAS.472.3805G. doi:10.1093/mnras/stx2219. eISSN 1365-2966. ISSN 0035-8711. S2CID 118879856.
  19. ^ EAS (1997). "The HIPPARCOS and TYCHO catalogues". Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission. ESA SP Series. 1200. Noordwijk, Netherlands: ESA Publications Division. Bibcode:1997HIP...C......0E. ISBN 9290923997. Retrieved 15 October 2022.
  20. ^ Jaschek, C.; Jaschek, M.; Kucewicz, B. (1964). "A Survey of Southern Be Stars". Zeitschrift für Astrophysik. 59: 108. Bibcode:1964ZA.....59..108J. ISSN 0372-8331. S2CID 117724232.
  21. ^ Vogt, N.; Faundez, A. M. (1 June 1979). "Photoelectric observations of peculiar A and related stars I: Strömgren photometry of 341 Ap stars". Astronomy and Astrophysics Supplement Series. 36: 477–484. Bibcode:1979A&AS...36..477V. ISSN 0365-0138.
  22. ^ Renson, P.; Manfroid, J. (March 1980). "Nouvelle Recherche de Periodes d'etoiles Ap Observees a l'ESO-IV". Information Bulletin on Variable Stars. 1755: 1. Bibcode:1980IBVS.1755....1R. ISSN 0374-0676.
  23. ^ Kholopov, P. N.; Samus', N. N.; Kukarkina, N. P.; Medvedeva, G. I.; Perova, N. B. (November 1981). "66th Name-List of Variable Stars". Information Bulletin on Variable Stars. 2042: 1. Bibcode:1981IBVS.2042....1K. ISSN 0374-0676.

April 12, 2024
v692, coronae, australis, 166596, 6804, simply, v692, whitish, blue, hued, variable, star, located, southern, constellation, corona, australis, maximum, apparent, magnitude, making, faintly, visible, naked, object, located, relatively, distance, approximately,. V692 Coronae Australis HD 166596 HR 6804 3 G CrA or simply V692 CrA is a whitish blue hued variable star located in the southern constellation Corona Australis It has a maximum apparent magnitude of 5 46 2 making it faintly visible to the naked eye The object is located relatively far at a distance of approximately 1 900 light years based on Gaia DR3 parallax measurements 1 but it is approaching the Solar System with a fairly constrained heliocentric radial velocity of 15 3 km s 8 At its current distance V692 CrA s brightness is heavily diminished by 0 46 magnitudes due to extinction due to interstellar dust 18 Its absolute magnitude depends on the source Westin 1985 gave a value of 6 44 9 while the extended Hipparcos catalogue gave a value of 2 26 10 V692 Coronae AustralisLocation of V692 CrA circled Observation dataEpoch J2000 0 Equinox J2000 0 ICRS Constellation Corona AustralisRight ascension 18h 13m 12 69843s 1 Declination 41 20 09 9972 1 Apparent magnitude V 5 46 2 5 46 5 51 3 CharacteristicsSpectral type B2 III 4 or B1 5 IIIp 5 B V color index 0 17 6 Variable type SX Arietis 7 AstrometryRadial velocity Rv 15 3 2 8 8 km sProper motion m RA 2 050 mas yr 1 Dec 6 210 mas yr 1 Parallax p 1 7423 0 0977 mas 1 Distance1 900 100 ly 570 30 pc Absolute magnitude MV 6 44 9 or 2 26 10 DetailsMass7 35 0 48 11 M Radius12 6 0 7 12 R Luminosity bolometric 4 181 11 L Surface gravity log g 3 52 0 33 0 14 1 cgsTemperature17 061 1 474 1 357 13 KRotational velocity v sin i 212 9 14 km sAge31 6 5 1 15 MyrOther designations3 G Corona Australis 16 V692 CrA CD 41 12534 CPD 41 8620 GC 24824 HD 166596 HIP 89290 HR 6804 SAO 228815 17 Database referencesSIMBADdata A light curve for V692 Coronae Australis plotted from Hipparcos data 19 Astronomers Carlos and Mercedes Jaschek along with a colleague listed HD 166596 as a Be star in 1964 20 However its status as an Ap star was not observed until 1979 by astronomers N Vogt and A M Faundez 21 A year later HD 166596 was observed to be variable and it had a period of 1 67 days 22 In 1981 its variability was confirmed and it was given the variable star designation V692 Coronae Australis the 692nd variable star in Corona Australis 23 The star might have a shorter period of 49 8 hours 7 V692 CrA has a stellar classification of B2 III 4 or B1 5 IIIp 5 both indicating that it is a slightly evolved B type giant star The second classification indicates that V692 CrA has peculiarities in its spectrum It has 7 35 times the mass of the Sun 11 and 12 6 times the Sun s radius 12 It radiates at a bolometric luminosity 4 181 times that of the Sun 11 from its photosphere at an effective temperature of 17 061 K 13 V692 CrA is estimated to be 31 6 million years old 15 and it spins rapidly with a projected rotational velocity of 212 km s 14 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 Hog E Fabricius C Makarov V V Urban S Corbin T Wycoff G Bastian U Schwekendiek P Wicenec A March 2000 The Tycho 2 catalogue of the 2 5 million brightest stars Astronomy and Astrophysics 355 L27 L30 Bibcode 2000A amp A 355L 27H ISSN 0004 6361 S2CID 17128864 VSX Detail for V0692 CrA www aavso org a b Houk Nancy 1978 Michigan catalogue of two dimensional spectral types for the HD stars Declinations 53 to 40 Vol 2 Bibcode 1978mcts book H a b Rountree Janet Sonneborn George March 1991 Criteria for the spectral classification of B stars in the ultraviolet The Astrophysical Journal 369 515 Bibcode 1991ApJ 369 515R doi 10 1086 169781 eISSN 1538 4357 ISSN 0004 637X S2CID 118640556 Johnson H L Mitchell R I Iriarte B Wisniewski W Z 1966 UBVRIJKL Photometry of the Bright Stars Communications of the Lunar and Planetary Laboratory 4 99 110 Bibcode 1966CoLPL 4 99J S2CID 118307502 a b Samus N N Kazarovets E V Durlevich O V Kireeva N N Pastukhova E N January 2017 General catalogue of variable stars Version GCVS 5 1 Astronomy Reports 61 1 80 88 Bibcode 2017ARep 61 80S doi 10 1134 S1063772917010085 eISSN 1562 6881 ISSN 1063 7729 S2CID 125853869 a b 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 eISSN 1562 6873 ISSN 1063 7737 S2CID 119231169 a b Westin T N G April 1985 The local system of early type stars Spatial extent and kinematics Astronomy and Astrophysics Supplement Series 60 99 134 Bibcode 1985A amp AS 60 99W ISSN 0365 0138 S2CID 119020376 a b Anderson E Francis Ch May 2012 XHIP An extended hipparcos compilation Astronomy Letters 38 5 331 346 arXiv 1108 4971 Bibcode 2012AstL 38 331A doi 10 1134 S1063773712050015 eISSN 1562 6873 ISSN 1063 7737 S2CID 119257644 a b c d Hohle M M Neuhauser R Schutz B F April 2010 Masses and luminosities of O and B type stars and red supergiants Astronomische Nachrichten 331 4 349 360 arXiv 1003 2335 Bibcode 2010AN 331 349H doi 10 1002 asna 200911355 eISSN 1521 3994 ISSN 0004 6337 S2CID 111387483 a b Kervella P Thevenin F Di Folco E Segransan D October 2004 The angular sizes of dwarf stars and subgiants Surface brightness relations calibrated by interferometry Astronomy amp Astrophysics 426 1 297 307 arXiv astro ph 0404180 Bibcode 2004A amp A 426 297K doi 10 1051 0004 6361 20035930 eISSN 1432 0746 ISSN 0004 6361 S2CID 6077801 a b Gulati R K Malagnini M L Morossi C October 1989 Empirical temperature calibrations for early type stars Astronomy and Astrophysics Supplement Series 80 73 88 Bibcode 1989A amp AS 80 73G ISSN 0365 0138 S2CID 115777506 a b Brown A G A Verschueren W March 1997 High S N Echelle spectroscopy in young stellar groups II Rotational velocities of early type stars in SCO OB2 Astronomy amp Astrophysics 319 811 838 arXiv astro ph 9608089 Bibcode 1997A amp A 319 811B ISSN 0004 6361 S2CID 118925453 a b Tetzlaff N Neuhauser R Hohle M M October 12 2010 A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun Monthly Notices of the Royal Astronomical Society 410 1 Oxford University Press OUP 190 200 arXiv 1007 4883 Bibcode 2011MNRAS 410 190T doi 10 1111 j 1365 2966 2010 17434 x ISSN 0035 8711 S2CID 118629873 Gould Benjamin Apthorp 1878 Uranometria Argentina brillantez y posicion de las estrellas fijas hasta la septima magnitud comprendidas dentro de cien grados del polo austral con atlas Resultados del Observatorio Nacional Argentino 1 Bibcode 1879RNAO 1 G V V692 CrA SIMBAD Centre de donnees astronomiques de Strasbourg Gontcharov George A Mosenkov Aleksandr V 28 September 2017 Verifying reddening and extinction for Gaia DR1 TGAS main sequence stars Monthly Notices of the Royal Astronomical Society 472 4 3805 3820 arXiv 1709 01160 Bibcode 2017MNRAS 472 3805G doi 10 1093 mnras stx2219 eISSN 1365 2966 ISSN 0035 8711 S2CID 118879856 EAS 1997 The HIPPARCOS and TYCHO catalogues Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission ESA SP Series 1200 Noordwijk Netherlands ESA Publications Division Bibcode 1997HIP C 0E ISBN 9290923997 Retrieved 15 October 2022 Jaschek C Jaschek M Kucewicz B 1964 A Survey of Southern Be Stars Zeitschrift fur Astrophysik 59 108 Bibcode 1964ZA 59 108J ISSN 0372 8331 S2CID 117724232 Vogt N Faundez A M 1 June 1979 Photoelectric observations of peculiar A and related stars I Stromgren photometry of 341 Ap stars Astronomy and Astrophysics Supplement Series 36 477 484 Bibcode 1979A amp AS 36 477V ISSN 0365 0138 Renson P Manfroid J March 1980 Nouvelle Recherche de Periodes d etoiles Ap Observees a l ESO IV Information Bulletin on Variable Stars 1755 1 Bibcode 1980IBVS 1755 1R ISSN 0374 0676 Kholopov P N Samus N N Kukarkina N P Medvedeva G I Perova N B November 1981 66th Name List of Variable Stars Information Bulletin on Variable Stars 2042 1 Bibcode 1981IBVS 2042 1K ISSN 0374 0676 Retrieved from https en wikipedia org w index php title V692 Coronae Australis amp oldid 1171018352, wikipedia, wiki, book, books, library,

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