HD 90132
Solitary White-hued star and high proper motion star / From Wikipedia, the free encyclopedia
HD 90132 (HR 4086) is a solitary[15] white hued star located in the southern constellation Antlia. It has an apparent magnitude of 5.33,[2] making it one of the brighter members of this generally faint constellation. The star is relatively close at a distance of 135 light years[1] but is receding with a heliocentric radial velocity of 17 km/s.[5]
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Antlia |
Right ascension | 10h 23m 29.29608s[1] |
Declination | −38° 00′ 35.4255″[1] |
Apparent magnitude (V) | 5.33±0.01[2] |
Characteristics | |
Spectral type | A8 V[3] |
B−V color index | +0.25[4] |
Astrometry | |
Radial velocity (Rv) | 17±4.2[5] km/s |
Proper motion (μ) | RA: −158.833 mas/yr[1] Dec.: −53.705 mas/yr[1] |
Parallax (π) | 24.2034 ± 0.0725 mas[1] |
Distance | 134.8 ± 0.4 ly (41.3 ± 0.1 pc) |
Absolute magnitude (MV) | +2.25[6] |
Details | |
Mass | 1.69±0.27[7] M☉ |
Radius | 1.87±0.87[7] R☉ |
Luminosity | 9.79±0.06[8] L☉ |
Surface gravity (log g) | 4.15[9] cgs |
Temperature | 7,737±263[9] K |
Metallicity [Fe/H] | −0.13[10] dex |
Rotational velocity (v sin i) | 270[11] km/s |
Age | 70[12] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 90132 has a stellar classification of A8 V,[3] indicating that it is an ordinary A-type main-sequence star. At present it has 1.69 times the mass of the Sun and 1.87 times the radius of the Sun.[7] Despite a young age of 70 million years,[12] the star has a lower surface gravity than expected.[9] This is due to the equator being 18% larger than the poles,[16] which is due to a high projected rotational velocity of 270 km/s.[11] Nevertheless, it shines with a luminosity of 9.8 L☉[8] from its photosphere at an effective temperature of 7,737 K.[9] HD 90132 is slightly metal deficient with a metallicity 74% that of Sun.[10]
This star was observed for infrared excess suggesting the presence of a circumstellar disk, but as of 2017 no excess have been found.[17]