Omega Aurigae
Star in the constellation Auriga
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Omega Aurigae is a double star[12] in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ω Aurigae, and abbreviated Omega Aur or ω Aur. This star has a combined apparent visual magnitude of 4.95,[3] which is bright enough to be seen with the naked eye. The distance to this system, as determined using parallax measurements, is approximately 162 light-years (50 parsecs).[2] It is receding from the Sun with a radial velocity of +8 km/s.[6] The system is a member of the Columba group of co-moving stars.[13]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | 04h 59m 15.409s[2] |
| Declination | +37° 53′ 24.88″[2] |
| Apparent magnitude (V) | 4.95[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | A1 V[5] |
| U−B color index | +0.01[3] |
| B−V color index | +0.05[3] |
| R−I color index | 0.03 |
| Astrometry | |
| Radial velocity (Rv) | +7.7±2.5[6] km/s |
| Proper motion (μ) | RA: +45.340 mas/yr[2] Dec.: −97.647 mas/yr[2] |
| Parallax (π) | 20.1236±0.2385 mas[2] |
| Distance | 162 ± 2 ly (49.7 ± 0.6 pc) |
| Absolute magnitude (MV) | +1.34[1] |
| Details | |
| ω Aur A | |
| Mass | 2.29±0.04[4] M☉ |
| Radius | 2.0[7] R☉ |
| Luminosity | 27[1] L☉ |
| Surface gravity (log g) | 4.33[5] cgs |
| Temperature | 9,230[5] K |
| Metallicity [Fe/H] | −0.12[5] dex |
| Rotational velocity (v sin i) | 107[8] km/s |
| Age | 317[9] Myr |
| ω Aur B | |
| Mass | 1.1[10] M☉ |
| Other designations | |
| ω Aur, 4 Aur, BD+37°1005, GC 6064, HD 31647, HIP 23179, HR 1592, SAO 57548, PPM 400070, WDS J04593+3753AB[11] | |
| Database references | |
| SIMBAD | data |
The primary component is an A-type main sequence star with a stellar classification of A1 V.[5] It is 317[9] million years old with a high rate of spin, showing a projected rotational velocity of 107 km/s.[8] The star has 2.3[4] times the mass of the Sun and double[7] the Sun's radius. It is radiating 27[1] times the Sun's luminosity from its photosphere at an effective temperature of 9,230 K.[5] The object displays an infrared excess, suggesting an orbiting debris disk with a temperature of 20 K at a mean radius of 932.40 AU from the host star.[7]
There is a magnitude 8.18 companion at an angular separation of 4.99 arcseconds along a position angle of 4.30°. This corresponds to a physical separation of 234.2 au.[10] The system is an X-ray source with a luminosity of 16.57×1029 ergs s−1.[14]