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Binary star in the constellation Auriga From Wikipedia, the free encyclopedia
HD 30453 is a binary star[8] system in the northern constellation of Auriga. It is visible to the naked eye with an apparent visual magnitude of 5.86.[2] The system is located at a distance of approximately 334 light years from the Sun based on parallax.[1] It is drifting further away from the Sun with a radial velocity of 16.65 km/s.[5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Auriga |
Right ascension | 04h 49m 19.08028s[1] |
Declination | +32° 35′ 17.4955″[1] |
Apparent magnitude (V) | 5.86[2] |
Characteristics | |
Spectral type | A8m[3] or Am(A7/F0/F2)[4] |
U−B color index | +0.14[2] |
B−V color index | +0.24[2] |
Astrometry | |
Radial velocity (Rv) | 16.654±0.012[5] km/s |
Proper motion (μ) | RA: +18.324[1] mas/yr Dec.: −34.866[1] mas/yr |
Parallax (π) | 9.7628 ± 0.1172 mas[1] |
Distance | 334 ± 4 ly (102 ± 1 pc) |
Orbit[5] | |
Period (P) | 7.0508687±0.0000023 d |
Semi-major axis (a) | ≥5.7633±0.0016 Gm |
Eccentricity (e) | 0.0 (adopted) |
Periastron epoch (T) | 2454673.72440±0.00043 MJD |
Semi-amplitude (K1) (primary) | 0.442±0.017 km/s |
Semi-amplitude (K2) (secondary) | 0.283±0.065 km/s |
Details | |
Radius | 3.59+0.16 −0.45[1] R☉ |
Luminosity | 38.2±0.5[1] L☉ |
Temperature | 7,568+532 −160[1] K |
Rotational velocity (v sin i) | 16.0±9.7[6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is a double-lined spectroscopic binary system with an essentially circular orbit and a period of one week.[5] The primary component is a chemically peculiar star of type CP1,[6] or Am star, with a stellar classification of A8m.[3] Abt and Morrell (1995) classed it as Am(A7/F0/F2),[4] indicating it has the hydrogen lines of an A7 star, the calcium K line of a cooler F0 star, and the metallic kines of an F2 class. It has been mentioned as a potential variable star.[9] The star has 3.6[1] times the girth of the Sun and is radiating 38 times the Sun's luminosity from its photosphere at an effective temperature of 7568 K.[1] It has a moderate rotation rate, with a projected rotational velocity of around 16 km/s.[6]
A third component was detected in 1987 using speckle interferometry at an angular separation of 0.04″.[5]
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