Gamma Arietis
Star in the constellation Aries / From Wikipedia, the free encyclopedia
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Gamma Arietis (γ Arietis, abbreviated Gamma Ari, γ Ari) is a binary star (possibly trinary) in the northern constellation of Aries. The two components are designated γ1 Arietis or Gamma Arietis B and γ2 Arietis or Gamma Arietis A (formally named Mesarthim /mɛˈsɑːrθɪm/, the traditional name for the Gamma Arietis system). γ1 Arietis may itself be a spectroscopic binary with a low mass companion.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 01h 53m 31.81479s[1] |
Declination | +19° 17′ 37.8790″[1] |
Apparent magnitude (V) | 3.86 (4.58/4.64)[2] |
Characteristics | |
Gamma1 Ari (B) | |
Spectral type | A0Vnp λ Boo[3] (A0IV-V(n)kB8)[4] |
B−V color index | −0.14[4] |
Gamma2 Ari (A) | |
Spectral type | A2IVpSiSrCr[5] |
B−V color index | −0.03[4] |
Variable type | α2 CVn[6] |
Astrometry | |
Radial velocity (Rv) | +3.7[7] km/s |
Proper motion (μ) | RA: +79.20[1] mas/yr Dec.: −97.63[1] mas/yr |
Parallax (π) | 19.88 ± 0.96 mas[1] |
Distance | 164 ± 8 ly (50 ± 2 pc) |
Details | |
Gamma1 Ari (Ba) | |
Mass | 2.67[8] M☉ |
Radius | 2.014 R☉ |
Luminosity | 42.0 L☉ |
Surface gravity (log g) | 4.26[8] cgs |
Temperature | 10,356[8] K |
Rotational velocity (v sin i) | 54[9] km/s |
Age | 34[10] Myr |
Gamma2 Ari (A) | |
Mass | 2.72[8] M☉ |
Radius | 1.941[8] R☉ |
Luminosity | 41.5 L☉ |
Surface gravity (log g) | 4.30[8] cgs |
Temperature | 10,512[8] K |
Metallicity [Fe/H] | 0.43±0.14[11] dex |
Rotational velocity (v sin i) | 201[9] km/s |
Gamma1 Ari (Bb) | |
Mass | 0.7[10] M☉ |
Temperature | 4,312[10] K |
Metallicity [Fe/H] | −0.5[10] dex |
Rotational velocity (v sin i) | 5[10] km/s |
Other designations | |
Gamma1 Ari (B): HD 11502, HR 545, SAO 92680, WDS J01535+1918B. | |
Gamma2 Ari (A): HD 11503, HR 546, SAO 92681, WDS J01535+1918A | |
Database references | |
SIMBAD | γ Ari |
γ1 Ari (B) | |
γ2 Ari (A) |
The combined apparent visual magnitude of the stars is 3.86,[2] which is readily visible to the naked eye and makes this the fourth-brightest member of Aries. Based upon parallax measurements obtained during the Hipparcos mission,[1] the distance to Gamma Arietis from the Sun is approximately 164 light-years (50 parsecs).