V343 Carinae is a blue-white star or star system in the southern constellation of Carina. It has the Bayer designation d Carinae, while V343 Carinae is a variable star designation. The star is visible to the naked eye with an apparent visual magnitude of 4.31.[3] The distance to this object is approximately 1,440 light years based on parallax. It is drifting further away with a radial velocity of +13 km/s.[3]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Carina |
Right ascension | 08h 40m 37.02758s[2] |
Declination | −59° 45′ 39.6067″[2] |
Apparent magnitude (V) | 4.31[3] |
Characteristics | |
Spectral type | B1.5III[4] |
B−V color index | −0.117±0.005[3] |
Variable type | Constant[5] |
Astrometry | |
Radial velocity (Rv) | +12.9±0.7[3] km/s |
Proper motion (μ) | RA: −6.63[2] mas/yr Dec.: +5.32[2] mas/yr |
Parallax (π) | 2.26 ± 0.11 mas[2] |
Distance | 1,440 ± 70 ly (440 ± 20 pc) |
Absolute magnitude (MV) | −3.91[3] |
Details | |
Mass | 12.5±0.6[6] M☉ |
Luminosity | 6,322.92[3] L☉ |
Temperature | 27,600±3,630[7] K |
Age | 15.7±0.1[6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
This star was originally thought to be a Beta Cephei variable and a suspected eclipsing binary[9] with an orbital period of 133.92 days. It is now considered as probably constant.[10][5] Measurements indicate that at most it is a microvariable star with an amplitude of 0.0041 in visual magnitude and a period of 0.42029 cycles per day.[11] Eggleton and Tokovinin (2008) catalogued this as a single star, albeit with some uncertainty.[12] However, Chini et al. (2012) listed it as a single-lined spectroscopic binary system.[13]
The visible component of V343 Carinae has a stellar classification of B1.5III,[4] matching a massive blue giant. It has 12.5[6] times the mass of the Sun and is an estimated 16[6] million years old. The star is radiating 6,323[3] times the Sun's luminosity from its photosphere at an effective temperature of 27,600 K.[7] It has a visual magnitude 13.3 companion at an angular separation of 16.4″ along a position angle of 339°, as of 2010.[14]