HD 93129
HD 93129 is a triple star system in the Carina Nebula, with all three components being hot O class stars amongst the most luminous stars in the Milky Way. It is the dominant member of the Trumpler 14 star cluster, a young star cluster within the Carina OB1 stellar association that harbors other super-luminous stars, like Eta Carinae and WR 25.
HD 93129 surrounded by the lesser stars of Trumpler 14 Credit: NASA & ESA, Jesús Maíz Apellániz (Instituto de Astrofisica de Andalucia) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Carina |
| Right ascension | 10h 43m 57.5s |
| Declination | −59° 32′ 51.3″ |
| Apparent magnitude (V) | 6.90 (7.310 + 8.84) |
| Characteristics | |
| A | |
| Spectral type | O2If* (O2If+O3.5V) |
| U−B color index | −0.81 |
| B−V color index | +0.25 |
| B | |
| Evolutionary stage | main sequence |
| Spectral type | O3.5 V((f))z |
| U−B color index | −0.79 |
| B−V color index | +0.23 |
| Astrometry | |
| Radial velocity (Rv) | −0.4 ± 7.4 km/s |
| Proper motion (μ) | RA: -5.0 mas/yr Dec.: 17.0 mas/yr |
| Distance | 2,300 pc |
| Absolute magnitude (MV) | (A): −6.5 (−6.1 + −5.2) (B): −4.9 |
| Details | |
| Aa | |
| Mass | 110 M☉ |
| Radius | 22.5 R☉ |
| Luminosity | 1,480,000 L☉ |
| Surface gravity (log g) | 3.71 cgs |
| Temperature | 42,500 K |
| Rotational velocity (v sin i) | 130 km/s |
| Age | 0.9+0.2 −0.4 Myr |
| Ab | |
| Mass | 70 M☉ |
| Radius | 13.1 R☉ |
| Luminosity | 575,000 L☉ |
| Temperature | 44,000 K |
| B | |
| Mass | 52 M☉ |
| Radius | 13 R☉ |
| Luminosity | 575,000 L☉ |
| Surface gravity (log g) | 3.92 cgs |
| Temperature | 44,000 K |
| Rotational velocity (v sin i) | 112 km/s |
| Other designations | |
| A: TYC 8626-2805-1, ALS 15862, LS 1820 | |
| B: ALS 19309 | |
| Database references | |
| SIMBAD | HD 93129 |
| HD 93129 A | |
| HD 93129 B | |
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