HD 8673

HD 8673
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]
Distance124.5 ± 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
Mass1.36±0.20 M
Radius1.521±0.049 R
Luminosity3.37+0.51
−0.44
 L
Surface gravity (log g)4.21 cgs
Temperature6,340 K
Metallicity [Fe/H]0.15 dex
Rotational velocity (v sin i)26.9 km/s
Age1.5+2.1
−0.6
 Gyr
HD 8673 B
Mass0.33–0.45[3] M
Temperature3,520-3,690[3] K
Other designations
BD+33°228, Gaia DR2 317350357498173312, HD 8673, HIP 6702, HR 410, SAO 54695, PPM 66283, WDS J01262+3435AB, IRAS 01232+3418, 2MASS J01260875+3434471[5]
Database references
SIMBADdata

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.

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference Roberts2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Valenti2005 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Mason2011 was invoked but never defined (see the help page).