  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 11h 08m 33.99848s [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 mas [1] |
| 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 | |
| z2 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. A 5th magnitude star, it is visible to the naked eye under good observing conditions.
In 1977, Christiaan Sterken announced his discovery that HD 96919 is a variable star. [10] It was given its variable star designation in 1979. [11] 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. [12]
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]
