V344 Carinae
Star in the constellation Carina
From Wikipedia, the free encyclopedia
V344 Carinae is a single[11] star in the southern constellation of Carina. It has the Bayer designation f Carinae, while V344 Carinae is its variable star designation. This star has a blue-white hue and is visible to the naked eye with an apparent visual magnitude that fluctuates around 4.50.[3] Historically, it was mentioned in the Almagest, suggesting that some time around 130 BCE it was brighter than its current magnitude.[12] This object is located at a distance of approximately 610 light-years from the Sun based on parallax.[2] The star is drifting further away with a radial velocity of around +27 km/s.[1]
  | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Carina[1] |
| Right ascension | 08h 46m 42.54928s[2] |
| Declination | −56° 46′ 11.1922″[2] |
| Apparent magnitude (V) | 4.43–4.52[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | B3V(n)[5] |
| B−V color index | −0.169±0.008[1] |
| Variable type | Be[6] |
| Astrometry | |
| Radial velocity (Rv) | +27.0±7.4[1] km/s |
| Proper motion (μ) | RA: −9.29[2] mas/yr Dec.: +8.85[2] mas/yr |
| Parallax (π) | 5.39±0.14 mas[2] |
| Distance | 610 ± 20 ly (186 ± 5 pc) |
| Absolute magnitude (MV) | −1.84[1] |
| Details | |
| Mass | 7.1±0.1[7] M☉ |
| Radius | 3.00±0.06[8] R☉ |
| Luminosity | 2,328+120 −105[9] L☉ |
| Surface gravity (log g) | 3.79±0.18[9] cgs |
| Temperature | 17,660±560[9] K |
| Rotational velocity (v sin i) | 268±18[9] km/s |
| Age | 31.6±3.9[7] Myr |
| Other designations | |
| f Car, V344 Car, CPD−56°1865, FK5 2695, GC 12138, HD 75311, HIP 43105, HR 3498, SAO 236268[10] | |
| Database references | |
| SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B3V(n).[5] It is a Be star; a rapidly rotating star that is hosting a circumstellar disk of hot, decreted gas.[14] In 1951, Alan William James Cousins announced his discovery that the star, then known as f Carinae, is a photometrically variable star.[15] It was given its variable star designation in 1975.[16] Its brightness ranges from 4.43 down to 4.52 in visual magnitude, and it has been classified as a Gamma Cassiopeiae variable.[3] The star is 32[7] million years old and is spinning with a projected rotational velocity of 268 km/s.[9] It has seven[7] times the mass of the Sun and around 3.0[8] times the Sun's radius. The star is radiating 2,328[9] times the luminosity of the Sun from its photosphere at an effective temperature of 17,660 K.[9]