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Binary star in the constellation Centaurus From Wikipedia, the free encyclopedia
HD 97413 is a binary star located in the southern constellation Centaurus. The system has a combined magnitude of 6.27,[2] placing it near the limit for naked eye visibility. Based on parallax measurements from the Gaia spacecraft, the system is located 320 light years away from the Solar System.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Centaurus |
Right ascension | 11h 12m 10.18976s[1] |
Declination | −46° 16′ 00.3202″[1] |
Apparent magnitude (V) | 6.27±0.01[2] |
Characteristics | |
Spectral type | A1 V[3] |
U−B color index | +0.04[4] |
B−V color index | +0.15[4] |
Astrometry | |
Proper motion (μ) | RA: −46.711 mas/yr[1] Dec.: +9.593 mas/yr[1] |
Parallax (π) | 10.1866 ± 0.155 mas[1] |
Distance | 320 ± 5 ly (98 ± 1 pc) |
Absolute magnitude (MV) | +1.5[5] |
Details | |
A | |
Mass | 1.94±0.11[6] M☉ |
Radius | 2.18+0.05 −0.08[7] R☉ |
Luminosity | 19.6[8] L☉ |
Surface gravity (log g) | 4.07±0.05[6] cgs |
Temperature | 7,800[8] K |
Metallicity [Fe/H] | −0.29[9] dex |
Other designations | |
Database references | |
SIMBAD | data |
The objects binarity was detected in a Hipparcos survey. The two components can't be distinguished because both stars have an angular separation of 0.01″.[11] Nevertheless, speckle interferometry revealed the components to have a 2.6 magnitude difference.[12] They are located along a position angle of 250°.[11]
The visible component – HD 97413 A – has a stellar classification of A1 V, indicating that it is an ordinary A-type main-sequence star. It has 1.94 times the mass of the Sun[6] and a radius of 2.18 R☉.[7] It radiates 19.6 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 7,800 K,[8] giving it a white hue. However, this is not typical for an A1 star. Parameters determined by Gaia's extinction reveal HD 97413 A to have an iron abundance half of the Sun's,[9] making it metal deficient.
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