HD 8673
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. 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. 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 |
| Declination | +34° 34′ 46.9318″ |
| Apparent magnitude (V) | 6.34 |
| Characteristics | |
| Spectral type | F7 V + M2 V |
| B−V color index | 0.500±0.004 |
| Astrometry | |
| Radial velocity (Rv) | 19.08±0.14 km/s |
| Proper motion (μ) | RA: 236.271±0.030 mas/yr Dec.: −84.632±0.022 mas/yr |
| Parallax (π) | 26.2036 ± 0.0370 mas |
| Distance | 124.5 ± 0.2 ly (38.16 ± 0.05 pc) |
| Absolute magnitude (MV) | 3.56 |
| Orbit | |
| Semi-major axis (a) | 35–60 AU |
| Eccentricity (e) | < 0.5 |
| Inclination (i) | 75–85° |
| Details | |
| 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 M☉ |
| Temperature | 3,520-3,690 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
The primary component is an F-type main-sequence star with a stellar classification of F7 V. 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.
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. 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.