Chi Aurigae
 The location of χ Aurigae (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Auriga |
| Right ascension | 05h 32m 43.67312s[1] |
| Declination | +32° 11′ 31.2753″[1] |
| Apparent magnitude (V) | 4.74[2] |
| Characteristics | |
| Spectral type | B5 Iab[3] |
| U−B color index | –0.44[2] |
| B−V color index | +0.32[2] |
| R−I color index | 0.27 |
| Astrometry | |
| Radial velocity (Rv) | –0.2[4] km/s |
| Proper motion (μ) | RA: –1.52[1] mas/yr Dec.: –4.33[1] mas/yr |
| Distance | 3,000 ly (912[5] pc) |
| Absolute magnitude (MV) | –6.4[5] |
| Orbit[5] | |
| Period (P) | 676.85 ± 0.21 d |
| Eccentricity (e) | 0.116 ± 0.048 |
| Longitude of the node (Ω) | 181.7° ± 24.3° |
| Periastron epoch (T) | 2422754.2 ± 46.1 HJD |
| Semi-amplitude (K1) (primary) |
22.0 ± 2.9 km/s |
| Details | |
| Mass | 16.5-19 M☉ |
| Radius | 42.3 R☉ |
| Luminosity | 95,000 L☉ |
| Surface gravity (log g) | 2.5[5] cgs |
| Temperature | 15,500[6] K |
| Rotational velocity (v sin i) | 40[7] km/s |
| Other designations | |
Chi Aurigae (χ Aur, χ Aurigae) is the Bayer designation for a binary star in the northern constellation of Auriga. It is faintly visible to the naked eye with an apparent visual magnitude of 4.74.[2] The annual parallax shift of this object is much smaller than the measurement error, making distance estimates by that means unreliable.[1] The estimated distance to this star is approximately 3,000 light years. The brightness of the star is diminished by 1.26 in magnitude from extinction caused by intervening gas and dust.[5]
Chi Aurigae is a spectroscopic binary with an orbital period of 676.85 d and an eccentricity of 0.12.[9] The primary component of this system is a supergiant star with a stellar classification of B5 Iab.[3] It has a stellar wind that is causing mass loss at the rate of 0.38–0.46 × 10−9 solar masses per year, or the equivalent of the Sun's mass every 2.4 billion years.[6]
References
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- ↑ 2.0 2.1 2.2 2.3 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 5.0 5.1 5.2 5.3 5.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
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