Astronomy:V399 Carinae

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Short description: Star in the constellation Carina
This page is about Astronomy:P Carinae. For Astronomy:P Carinae, see PAstronomy:P Carinae.
V399 Carinae
Carina constellation map.svg
Red circle.svg
Location of V399 Carinae (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Carina
Right ascension  10h 27m 24.47049s[1]
Declination −57° 38′ 19.6984″[1]
Apparent magnitude (V) +4.63 to +4.72[2]
Characteristics
Spectral type A5Iae[3] or F0Ia[4]
U−B color index +0.22[5]
B−V color index +0.46[5]
Variable type SRd?[2]
Astrometry
Proper motion (μ) RA: −7.377[1] mas/yr
Dec.: +3.688[1] mas/yr
Parallax (π)0.4976 ± 0.1151[1] mas
Distanceapprox. 7,000 ly
(approx. 2,000 pc)
Absolute magnitude (MV)−8.8[6]
Details
Mass22.6[7] M☉
Radius171[8] R☉
Luminosity73,000[9] L☉
Surface gravity (log g)1.00[10] cgs
Temperature8,000[11] K
Metallicity [Fe/H]−0.06[10] dex
Age12[12] Myr
Other designations
P Carinae,[13] 195 G. Carinae,[14] HR 4110, HD 90772, CP−57°3256, HIP 51192, SAO 238077, GC 14373, IC 2581 1
Database references
SIMBADdata

V399 Carinae (V399 Car, P Carinae, P Car, 195 G. Carinae) is a variable star in the constellation Carina.

The spectral type of V399 Carinae has been variously assigned between A5 and F0,[15] being a bright, luminous supergiant.[16] Its spectrum is described as having a non-photospheric continuum and silicon absorption lines, indicative of high mass loss.[17]

A visual band light curve for V399 Carinae, adapted from Berdnikov and Turner (1997)[6]

V399 Carinae has long been suspected to be variable.[18] A 1981 study of yellow supergiants fit observations to a Cepheid-like light curve with a period of 58.8 days, although the luminosity and spectral type do not place the star near the Cepheid instability strip.[15] It was listed in the General Catalogue of Variable Stars as a possible δ Cep variable.[19] Further observations refined the period to 47.25 days.[6] The Hipparcos catalogue classified V399 Car as a semiregular variable with a period of 88 days and a mean amplitude of only 0.04 magnitudes.[20] An automated classification from Hipparos photometry suggested it is an α Cygni variable.[21] The observed brightness varies from magnitude +4.63 to +4.72.[2]

V399 Carinae lies amongst the stars of the open cluster IC 2581, by far the brightest member of the cluster. It is about 7,500 light years from Earth assuming it is a member of IC 2581, which is given a 62.9% probability.[22]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 2.2 Watson, C. L. (2006). "The International Variable Star Index (VSX)". The Society for Astronomical Sciences 25th Annual Symposium on Telescope Science. Held May 23–25 25: 47. Bibcode: 2006SASS...25...47W. 
  3. ↑ Gray, R. O.; Garrison, R. F. (1989). "The late A-type stars - Refined MK classification, confrontation with Stromgren photometry, and the effects of rotation". Astrophysical Journal Supplement Series 70: 623. doi:10.1086/191349. Bibcode: 1989ApJS...70..623G. 
  4. ↑ Dambis, A. K. (February 2013). "Revisiting the absolute-magnitude calibration of F-type supergiants and bright giants as a function of the equivalent width of the OIλ7774Å triplet". Advancing the Physics of Cosmic Distances, Proceedings of the International Astronomical Union, IAU Symposium 289: 379−381. doi:10.1017/S1743921312021758. Bibcode: 2013IAUS..289..379D. 
  5. ↑ 5.0 5.1 Schild, R. E.; Garrison, R. F.; Hiltner, W. A. (1983). "UBV photometry for southern OB stars". Astrophysical Journal Supplement Series 51: 321. doi:10.1086/190852. Bibcode: 1983ApJS...51..321S. 
  6. ↑ 6.0 6.1 6.2 Berdnikov, L. N.; Turner, D. G. (1997). "Photoelectric VIc and New Elements for V399 Carinae = HR 4110". Information Bulletin on Variable Stars 4456: 1. Bibcode: 1997IBVS.4456....1B. 
  7. ↑ Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics 657: A7. doi:10.1051/0004-6361/202142146. ISSN 0004-6361. Bibcode: 2022A&A...657A...7K. 
  8. ↑ Stassun, Keivan G. et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. ISSN 0004-6256. Bibcode: 2019AJ....158..138S. 
  9. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  10. ↑ 10.0 10.1 Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal 147 (6): 137. doi:10.1088/0004-6256/147/6/137. Bibcode: 2014AJ....147..137L. 
  11. ↑ Rest, A.; Prieto, J. L.; Walborn, N. R.; Smith, N.; Bianco, F. B.; Chornock, R.; Welch, D. L.; Howell, D. A. et al. (2012). "Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption". Nature 482 (7385): 375–8. doi:10.1038/nature10775. PMID 22337057. Bibcode: 2012Natur.482..375R. 
  12. ↑ Luck, R. Earle (1994). "Open cluster chemical composition. 1: Later type stars in eight clusters". Astrophysical Journal Supplement Series 91: 309. doi:10.1086/191940. Bibcode: 1994ApJS...91..309L. 
  13. ↑ Kostjuk, N. D. (2004). "VizieR Online Data Catalog: HD-DM-GC-HR-HIP-Bayer-Flamsteed Cross Index (Kostjuk, 2002)". VizieR On-line Data Catalog: IV/27A. Originally Published in: Institute of Astronomy of Russian Academy of Sciences (2002) 4027. Bibcode: 2004yCat.4027....0K. 
  14. ↑ Benjamin Apthorp Gould (1879). Uranometria Argentina: Brightness and Position of Every Fixed Star, Down to the Seventh Magnitude, Within One Hundred Degrees of the South Pole. Coni. pp. 159–. https://books.google.com/books?id=VhE1AQAAIAAJ&pg=PA159. 
  15. ↑ 15.0 15.1 Arellano Ferro, A. (1981). "A survey of variable yellow supergiants in the southern Milky Way". Astronomical Society of the Pacific 93: 351. doi:10.1086/130837. Bibcode: 1981PASP...93..351A. 
  16. ↑ Evans, L.; Francis, Ch. (1969). "The open cluster IC 2581". Monthly Notices of the Royal Astronomical Society 146 (5): 101. doi:10.1093/mnras/146.2.101. Bibcode: 1969MNRAS.146..101L. 
  17. ↑ Ardila, David R.; Van Dyk, Schuyler D.; Makowiecki, Wojciech; Stauffer, John; Song, Inseok; Rho, Jeonghee; Fajardo-Acosta, Sergio; Hoard, D. W. et al. (2010). "The Spitzer Atlas of Stellar Spectra (SASS)". The Astrophysical Journal Supplement 191 (2): 301. doi:10.1088/0067-0049/191/2/301. Bibcode: 2010ApJS..191..301A. 
  18. ↑ Arp, H. C. (1958). "Southern hemisphere photometry II Photoelectric measures of bright stars". Astronomical Journal 63: 118. doi:10.1086/107703. Bibcode: 1958AJ.....63..118A. 
  19. ↑ Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (1985). "The 67th Name-List of Variable Stars". Information Bulletin on Variable Stars 2681: 1. Bibcode: 1985IBVS.2681....1K. 
  20. ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F. et al. (1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics 323: L49. Bibcode: 1997A&A...323L..49P. 
  21. ↑ Dubath, P.; Rimoldini, L.; Süveges, M.; Blomme, J.; López, M.; Sarro, L. M.; De Ridder, J.; Cuypers, J. et al. (2011). "Random forest automated supervised classification of Hipparcos periodic variable stars". Monthly Notices of the Royal Astronomical Society 414 (3): 2602. doi:10.1111/j.1365-2966.2011.18575.x. Bibcode: 2011MNRAS.414.2602D. 
  22. ↑ Baumgardt, H.; Detbarn, C.; Wielen, R. (2000). "Absolute proper motions of open clusters. I. Observational data". Astronomy and Astrophysics Supplement 146 (2): 251. doi:10.1051/aas:2000362. Bibcode: 2000A&AS..146..251B. 



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