12 Aurigae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 6.988[2] |
| Characteristics | |
| Spectral type | B2 Ve[3] |
| Astrometry | |
| Proper motion (μ) | RA: −3.321[1] mas/yr Dec.: −1.2106[1] mas/yr |
| Parallax (π) | 1.5264±0.0303 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| Mass | 3.0[4] Template:Solar mass |
| Radius | 18[5] Template:Solar radius |
| Luminosity | 635[5] Template:Solar luminosity |
| Surface gravity (log g) | 2.47[4] cgs |
| Temperature | 8,688[6] K |
| Metallicity | −0.94[4] |
| Rotational velocity (v sin i) | Template:Val[7] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
12 Aurigae is a Be star in the northern constellation Auriga. It lies below the normal limit for visibility to the naked eye, having an apparent visual magnitude of 6.988.[2] It lacks a designation from the Hipparcos catalogue. It is located just under half a degree north of Capella.[8]
Assigned spectral classes for 12 Aurigae vary greatly from B2 to B5 and the luminosity class from V (main sequence) to Ia (luminous supergiant). Its spectrum shows prominent emission lines, but the spectrum is complicated by the appearance of sharp shell components to some of the spectral lines.[9] The colour of the star as shown by the B-V and U-B colour indices is not consistent with an early B spectral class,[10] leading to many estimates of its effective temperature that are much lower than expected for a B-class star.[6][4] The expected temperature for a B5 spectral type would be Template:Val,[11] but most sources assign a temperature of around Template:Val.[6][4] Other properties also vary between different sources, for example the bolometric luminosity derived from the distance and temperature is Template:Solar luminosity,[6] while it is Template:Solar luminosity when derived by fitting the spectral energy distribution.[5] A calculation of the stellar properties assuming the maximum possible interstellar extinction in the direction of 12 Aurigae results in a temperature of Template:Val and a luminosity of Template:Solar luminosity, although it is strongly noted that the likely extinction is much lower.[5]
References
- ↑ a b c d e Template:Cite Gaia DR3
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b c d e Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ a b c d Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b Template:Cite simbad
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".