V399 Carinae

V399 Carinae


Location of V399 Carinae (circled)

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Carina
Right ascension 10h 27m 24.47114s[1]
Declination −57° 38′ 19.6958″[1]
Apparent magnitude (V) +4.63 to +4.72.[2]
Characteristics
Spectral type A5Iae[3]
U−B color index +0.22[4]
B−V color index +0.46[4]
Variable type SRd?[2]
Astrometry
Proper motion (μ) RA: −6.51 ± 0.29[1] mas/yr
Dec.: 3.82 ± 0.26[1] mas/yr
Parallax (π)0.06 ± 0.28[1] mas
Distance2,308[5] pc
Absolute magnitude (MV)−8.8[6]
Details
Luminosity305,000[7] L☉
Surface gravity (log g)1.00[8] cgs
Temperature8,000[9] K
Age12[5] Myr
Other designations
P Carinae,[10] 195 G. Carinae,[11] 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.

Classification

The spectral type of V399 Carinae has been variously assigned between A5 and F0,[12] being a bright, luminous supergiant.[13] Its spectrum is described as having a non-photospheric continuum and silicon absorption lines, indicative of high mass loss.[14]

Variability

V399 Carinae has long been suspected to be variable.[15] A 1981 study of yellow supergiants fit observations to a Cepheid-like light curve with a period of 58.8 days, although it was noted that the luminosity and spectral type do not place the star near the Cepheid instability strip.[12] It was listed in the General Catalogue of Variable Stars as a possible δ Cep variable.[16] 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.[17] An automated classification from Hipparos photometry suggested it is an α Cygni variable.[18] The observed brightness varies from magnitude +4.63 to +4.72.[2]

Properties

V399 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.[19]

References

  1. 1 2 3 4 5 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. 1 2 3 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. Bibcode:1989ApJS...70..623G. doi:10.1086/191349.
  4. 1 2 Schild, R. E.; Garrison, R. F.; Hiltner, W. A. (1983). "UBV photometry for southern OB stars". Astrophysical Journal Supplement Series. 51: 321. Bibcode:1983ApJS...51..321S. doi:10.1086/190852.
  5. 1 2 Luck, R. Earle (1994). "Open cluster chemical composition. 1: Later type stars in eight clusters". Astrophysical Journal Supplement Series. 91: 309. Bibcode:1994ApJS...91..309L. doi:10.1086/191940.
  6. 1 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. ↑ Arno, Valter. "RAPID APPROXIMATION OF FUNDAMENTAL PARAMETERS AND SCENARIOS - N GALACTIC OPEN CLUSTER STUDIES." (PDF).
  8. ↑ Luck, R. Earle (2014). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147 (6): 137. Bibcode:2014AJ....147..137L. doi:10.1088/0004-6256/147/6/137.
  9. ↑ Rest, A.; Prieto, J. L.; Walborn, N. R.; Smith, N.; Bianco, F. B.; Chornock, R.; Welch, D. L.; Howell, D. A.; Huber, M. E.; Foley, R. J.; Fong, W.; Sinnott, B.; Bond, H. E.; Smith, R. C.; Toledo, I.; Minniti, D.; Mandel, K. (2012). "Light echoes reveal an unexpectedly cool η Carinae during its nineteenth-century Great Eruption". Nature. 482 (7385): 375. Bibcode:2012Natur.482..375R. PMID 22337057. doi:10.1038/nature10775.
  10. ↑ 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.
  11. ↑ 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–.
  12. 1 2 Arellano Ferro, A. (1981). "A survey of variable yellow supergiants in the southern Milky Way". Astronomical Society of the Pacific. 93: 351. Bibcode:1981PASP...93..351A. doi:10.1086/130837.
  13. ↑ Evans, L.; Francis, Ch. (1969). "The open cluster IC 2581". Monthly Notices of the Royal Astronomical Society. 146 (5): 101. Bibcode:1969MNRAS.146..101L. doi:10.1093/mnras/146.2.101.
  14. ↑ Ardila, David R.; Van Dyk, Schuyler D.; Makowiecki, Wojciech; Stauffer, John; Song, Inseok; Rho, Jeonghee; Fajardo-Acosta, Sergio; Hoard, D. W.; Wachter, Stefanie (2010). "The Spitzer Atlas of Stellar Spectra (SASS)". The Astrophysical Journal Supplement. 191 (2): 301. Bibcode:2010ApJS..191..301A. doi:10.1088/0067-0049/191/2/301.
  15. ↑ Arp, H. C. (1958). "Southern hemisphere photometry II Photoelectric measures of bright stars". Astronomical Journal. 63: 118. Bibcode:1958AJ.....63..118A. doi:10.1086/107703.
  16. ↑ 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.
  17. ↑ Perryman, M. A. C.; Lindegren, L.; Kovalevsky, J.; Hoeg, E.; Bastian, U.; Bernacca, P. L.; Crézé, M.; Donati, F.; Grenon, M.; Grewing, M.; Van Leeuwen, F.; Van Der Marel, H.; Mignard, F.; Murray, C. A.; Le Poole, R. S.; Schrijver, H.; Turon, C.; Arenou, F.; Froeschlé, M.; Petersen, C. S. (1997). "The HIPPARCOS Catalogue". Astronomy and Astrophysics. 323: L49. Bibcode:1997A&A...323L..49P.
  18. ↑ Dubath, P.; Rimoldini, L.; Süveges, M.; Blomme, J.; López, M.; Sarro, L. M.; De Ridder, J.; Cuypers, J.; Guy, L.; Lecoeur, I.; Nienartowicz, K.; Jan, A.; Beck, M.; Mowlavi, N.; De Cat, P.; Lebzelter, T.; Eyer, L. (2011). "Random forest automated supervised classification of Hipparcos periodic variable stars". Monthly Notices of the Royal Astronomical Society. 414 (3): 2602. Bibcode:2011MNRAS.414.2602D. doi:10.1111/j.1365-2966.2011.18575.x.
  19. ↑ Baumgardt, H.; Detbarn, C.; Wielen, R. (2000). "Absolute proper motions of open clusters. I. Observational data". Astronomy and Astrophysics Supplement. 146 (2): 251. Bibcode:2000A&AS..146..251B. arXiv:astro-ph/0010306 Freely accessible. doi:10.1051/aas:2000362.
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