VZ Arietis
Star in the constellation Aries
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VZ Arietis is single,[10] white-hued star in the northern zodiac constellation of Aries. Varying between magnitudes 5.82 and 5.89,[3] the star can be seen with the naked eye in dark, unpolluted areas. Based upon an annual parallax shift of 5.8 mas,[2] it is located 560 light-years from the Sun. It is moving further away with a heliocentric radial velocity of +14 km/s.[6] The star was formerly known as 16 Trianguli, but as the star is no longer in the constellation Triangulum, this designation has fallen out of use.[11]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 02h 48m 45.90326s[2] |
| Declination | +25° 11â² 16.9880â³[2] |
| Apparent magnitude (V) | 5.82â5.89[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2][4] |
| Spectral type | A0 V[5] |
| BâV color index | â0.033±0.005[1] |
| Variable type | α2 CVn[3] |
| Astrometry | |
| Radial velocity (Rv) | +13.8±2.9[6] km/s |
| Proper motion (μ) | RA: +60.139[2] mas/yr Dec.: â2.475[2] mas/yr |
| Parallax (Ï) | 6.2922±0.1856 mas[2] |
| Distance | 520 ± 20 ly (159 ± 5 pc) |
| Absolute magnitude (MV) | +0.48[1] |
| Details | |
| Mass | 2.74±0.09[4] Mâ |
| Radius | 3.1[7] Râ |
| Luminosity | 78.7+15.1 â12.7[4] Lâ |
| Surface gravity (log g) | 4.10[8] cgs |
| Temperature | 10,304+72 â71[4] K |
| Metallicity [Fe/H] | +0.1[8] dex |
| Rotational velocity (v sin i) | 54[4] km/s |
| Other designations | |
| 16 Trianguli, VZ Arietis, BD+24°396, FK5 5868, HD 17471, HIP 13121, HR 830, SAO 75588[9] | |
| Database references | |
| SIMBAD | data |
In 1984, the Czechoslovak astronomer Juraj Zverko announced that the star, then called HR 830, is a variable star.[12] It was given its variable star designation, VZ Arietis, in 1987.[13]
This is a chemically peculiar star[4] of type CP2 (Ap star),[14] showing an anomalous abundance of silicon in its spectrum.[12] It has a stellar classification of A0 V,[5] which indicates this is an A-type main-sequence star that currently fusing hydrogen into helium in its core. This is an Alpha2 Canum Venaticorum variable[14] with 2.7[4] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 79 times the Sun's luminosity from its photosphere at an effective temperature of 10,304 K.[4]