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Binary star in the constellation Andromeda From Wikipedia, the free encyclopedia
HD 8673 is a binary star in the northern constellation of Andromeda. It has an apparent magnitude and absolute magnitude of 6.34 and 3.56 respectively.[2] Based upon an annual parallax shift of 26.2 mas, the system is located around 124.5 light years away. The system is moving further from the Earth with a heliocentric radial velocity of +19 km/s.[1] A sub-stellar companion was detected in 2005; it could either be an exoplanet or a brown dwarf.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Andromeda |
Right ascension | 01h 26m 08.78637s[1] |
Declination | +34° 34′ 46.9318″[1] |
Apparent magnitude (V) | 6.34[2] |
Characteristics | |
Spectral type | F7 V + M2 V[3] |
B−V color index | 0.500±0.004[2] |
Astrometry | |
Radial velocity (Rv) | 19.08±0.14[1] km/s |
Proper motion (μ) | RA: 236.271±0.030 mas/yr[1] Dec.: −84.632±0.022 mas/yr[1] |
Parallax (π) | 26.2036 ± 0.0370 mas[1] |
Distance | 124.5 ± 0.2 ly (38.16 ± 0.05 pc) |
Absolute magnitude (MV) | 3.56[2] |
Orbit[3] | |
Semi-major axis (a) | 35–60 AU |
Eccentricity (e) | < 0.5 |
Inclination (i) | 75–85° |
Details[4] | |
HD 8673 A | |
Mass | 1.36±0.20 M☉ |
Radius | 1.521±0.049 R☉ |
Luminosity | 3.37+0.51 −0.44 L☉ |
Surface gravity (log g) | 4.21 cgs |
Temperature | 6,340 K |
Metallicity [Fe/H] | 0.15 dex |
Rotational velocity (v sin i) | 26.9 km/s |
Age | 1.5+2.1 −0.6 Gyr |
HD 8673 B | |
Mass | 0.33–0.45[3] M☉ |
Temperature | 3,520-3,690[3] K |
Other designations | |
Database references | |
SIMBAD | data |
The primary component is an F-type main-sequence star with a stellar classification of F7 V.[3] It has 1.36 times the mass of the Sun and 1.52 times the Sun's radius. The star is around 1.5 billion years old and is spinning with a projected rotational velocity of 26.9 km/s. It is radiating 3.4 times the Sun's luminosity from its photosphere at an effective temperature of 6,340 K.[4]
Speckle interferometry measurements of this star between 2001 and 2008 showed a candidate stellar companion to this star, announced in 2011. It was unclear whether the pair formed a visual double or a binary system. The authors of the study estimated a class of K2 V, based upon a visual magnitude difference of 2.3±0.5.[6] Subsequent observations using adaptive options did not spot this companion and it was concluded this was a false detection. However, a low mass stellar companion was detected in a wide orbit. This red dwarf star has 0.33–0.45 times the mass of the Sun and is orbiting with a semimajor axis of 35–60 AU.[3]
An orbiting sub-stellar companion with a minimum mass 14 times that of Jupiter in a high-eccentricity orbit was discovered in 2005 and confirmed in 2010. This object orbits at 3 AU away from the primary star with a period of 1,634 days and an eccentricity of 0.7.[7] In 2022, the inclination and true mass of HD 8673 Ab were measured via astrometry.[8]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 13.248+1.688 −1.416 MJ |
2.970+0.147 −0.171 |
4.503+0.030 −0.043 |
0.730+0.042 −0.026 |
95.450+19.444 −8.816° |
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