V399 Carinae

V399 Carinae
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) +4.69[2]
Absolute magnitude (V)−7.33[3]
Spectral typeA7 Ia-0[2] : A51ae [3]
Other designations
P Carinae, HR 4110, HD 90772, CP−57°3256, HIP 51192, SAO 238077, GC 14373, IC 2581 '1'

V399 Carinae (V399 Car) or P Carinae (P Car) is a variable star in the constellation Carina.

V399 Carinae is a white A-type star that is either a supergiant [4] or possibly a hypergiant that is assumed by the higher absolute magnitude of −8.[2] Mean magnitude is +4.65V, with its approximate distance 8,000 light years (2450 parsecs)[5] from Earth assuming it is a member of the IC 2581 open cluster, which it has a 0.63 probability. [6]

Its brightness varies from magnitude +4.64 to +4.71 with various periods of 1-2 months. It is classified as a Cepheid variable star, but almost certainly isn't.[7]

References

  1. 1 2 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 Turner, D. G. (1978). "The value of R in IC 2581". Astronomical Journal 83: 1081. Bibcode:1978AJ.....83.1081T. doi:10.1086/112294.
  3. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  4. ↑ 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.
  5. ↑ "WEBDA page for open cluster IC 2581". Retrieved 6 May 2016.
  6. ↑ Baumgardt, H.; Detbarn, C.; Wielen, R. (2000). "Absolute proper motions of open clusters. I. Observational data". Astronomy and Astrophysics Supplement 146: 251. arXiv:astro-ph/0010306. Bibcode:2000A&AS..146..251B. doi:10.1051/aas:2000362.
  7. ↑ 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.
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