HD 96919

V371 Carinae

Location of V361 Carinae (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Carina
Right ascension	11^h 08^m 33.99848^s[1]
Declination	−61° 56′ 49.8316″[1]
Apparent magnitude (V)	5.19[2] (5.12 - 5.19[3])
Characteristics
Spectral type	B9 Iae[4]
U−B color index	−0.46[2]
B−V color index	+0.23[2]
Variable type	α Cyg[3]
Astrometry
Radial velocity (Rv)	−22.4 ± 2[5] km/s
Proper motion (μ)	RA: −5.78[1] mas/yr Dec.: 1.74[1] mas/yr
Parallax (π)	0.23 ± 0.25[1] mas
Distance	1,920[6] pc
Absolute magnitude (MV)	−7.0[6]
Details
Mass	23[4] M☉
Radius	141[4] R☉
Luminosity	105,000[7] L☉
Surface gravity (log g)	1.50[4] cgs
Temperature	12,500[7] K
Rotational velocity (v sin i)	60[4] km/s
Other designations
z^2 Carinae, V371 Carinae, 261 G. Carinae,[8] CD−61°2941, CPD−61°2075, CPC 20.1 3080, FK5 2891, GC 15331, GCRV 6856, GSC 08962-02640, HD 96919, HIC 54461, HIP 54461, HR 4338, PPM 358516, SAO 251286
Database references
SIMBAD	data

HD 96919, also known by its Bayer designation of z² Carinae and the variable star designation of V371 Carinae, is a blue supergiant star in the constellation Carina. It lies near the Carina Nebula and at a comparable distance.

V371 Car is an α Cyg variable, erratically pulsating and changing brightness by a few hundredths of a magnitude. Periods of 10 - 80 days have been identified.^[7] It shows unusual emission lines in its spectrum, and high-velocity absorption (HVA) events, temporary spectral features that are thought to indicate localised regions of enhanced mass loss.^[9]

HD 96919 is a B9 supergiant, possibly located 6,000 light years from Earth. It is considered to be a post red supergiant star, either evolving towards a Wolf-Rayet star or on a blue loop before returning to a cooler temperature.^[7]

References

1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
2. 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: 0. Bibcode:2002yCat.2237....0D.
3. 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.
4. Kaufer, A.; Stahl, O.; Wolf, B.; Gaeng, T.; Gummersbach, C. A.; Kovacs, J.; Mandel, H.; Szeifert, T. (1996). "Long-term spectroscopic monitoring of BA-type supergiants. I. Halpha_ line-profile variability". Astronomy and Astrophysics 305: 887. Bibcode:1996A&A...305..887K.
5. Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington. Bibcode:1953GCRV..C......0W.
6. Kaltcheva, N.; Scorcio, M. (2010). "The Carina spiral feature: Strömgren-β photometry approach. II. Distances and space distribution of the O and B stars". Astronomy and Astrophysics 514: A59. Bibcode:2010A&A...514A..59K. doi:10.1051/0004-6361/200913399.
7. Saio, Hideyuki; Georgy, Cyril; Meynet, Georges (2013). "Evolution of blue supergiants and α Cygni variables: Puzzling CNO surface abundances". Monthly Notices of the Royal Astronomical Society 433 (2): 1246. arXiv:1305.2474. Bibcode:2013MNRAS.433.1246S. doi:10.1093/mnras/stt796.
8. Gould, Benjamin Apthorp (1879). "Brightness and position of every star, down to the seventh magnitude, within one hundred degrees of the South Pole". Resultados del Observatorio Nacional Argentino 1. Bibcode:1879RNAO....1....1G.
9. Kaufer, A.; Stahl, O.; Wolf, B.; Gaeng, T.; Gummersbach, C. A.; Jankovics, I.; Kovacs, J.; Mandel, H.; Peitz, J.; Rivinius, T.; Szeifert, T. (1996). "Long-term spectroscopic monitoring of BA-type supergiants. II. High-velocity absorptions in βOri and HD96919". Astronomy and Astrophysics 314: 599. Bibcode:1996A&A...314..599K.