Psi9 Aurigae
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Template:Location mark Location of ψ9 Aurigae (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Auriga[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.75[3] |
| Characteristics | |
| Spectral type | B8 IIIe[4] |
| U−B Template:Engvar | −0.46[5] |
| B−V Template:Engvar | −0.06[5] |
| Astrometry | |
| Radial velocity (Rv) | −41.1±2.9[6] km/s |
| Proper motion (μ) | RA: −3.263 mas/yr[2] Dec.: +5.040 mas/yr[2] |
| Parallax (π) | 3.4481±0.0560 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −2.03[1] |
| Details | |
| Mass | 2.4[7] Template:Solar mass |
| Radius | 3.7[3] Template:Solar radius |
| Luminosity | 868[1] Template:Solar luminosity |
| Surface gravity (log g) | 2.71[7] cgs |
| Temperature | 9,573[7] K |
| Metallicity [Fe/H] | −0.55[8] dex |
| Rotational velocity (v sin i) | 235[9] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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Psi9 Aurigae is a star in the northern constellation of Auriga. Its name is a Bayer designation that is Latinized from ψ9 Aurigae, and abbreviated Psi9 Aur or ψ9 Aur. This star is dimly visible to the naked eye with an apparent visual magnitude of 5.75. Based upon an annual parallax shift of Script error: No such module "val"., the distance to this star is approximately Script error: No such module "convert".. It is drifting closer to the Sun with a radial velocity of −41 km/s.[6] This is most likely (88.5% chance) a runaway star, having a peculiar velocity of 31.8Script error: No such module "Su". km/s.[11]
The spectrum of Psi9 Aurigae matches a giant star with a stellar classification of B8 IIIe.[4] The 'e' suffix indicates this is a Be star that shows emission lines of hydrogen in its spectrum. This is caused by a circumstellar shell of hot gas. The emission undergoes variability on a time scale of sixteen years.[4] This star is spinning rapidly with a projected rotational velocity of 235 km/s.[9] It has 2.4[7] times the mass of the Sun and 3.7 times the Sun's radius.[3] ψ9 Aur is radiating 868[1] times the luminosity of the Sun from its photosphere at an effective temperature of 9,573 K.[7]
References
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- ↑ a b c d Template:Cite XHIP
- ↑ a b c d Template:Cite Gaia DR3
- ↑ a b c Script error: No such module "citation/CS1".
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- ↑ a b c d e Script error: No such module "citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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External links
- HR 2568 Bright Star Catalog entry
- φ9 Aurigae image