Xi Columbae

Xi Columbae
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Columba
Right ascension 05h 55m 29.91038s[1]
Declination −37° 07′ 14.3232″[1]
Apparent magnitude (V) 4.97[2]
Characteristics
Spectral type K1 III CNII[3]
B−V color index +1.096[2]
Astrometry
Radial velocity (Rv)+59.5[4] km/s
Proper motion (μ) RA: +38.020[1] mas/yr
Dec.: −23.491[1] mas/yr
Parallax (π)10.0920 ± 0.1408 mas[1]
Distance323 ± 5 ly
(99 ± 1 pc)
Absolute magnitude (MV)−0.05[5]
Orbit[5]
Period (P)1420.6 d
Semi-major axis (a)3.60 AU
Eccentricity (e)0.39
Semi-amplitude (K1)
(primary)		5.68 km/s
Details
Radius16.23+0.14
−2.27[1] R☉
Luminosity120±2[1] L☉
Surface gravity (log g)2.26[2] cgs
Temperature4,743+372
−20[1] K
Metallicity [Fe/H]+0.29[2] dex
Rotational velocity (v sin i)2.6[5] km/s
Other designations
ξ Col, CD−37°2487, HD 40176, HIP 28010, HR 2087, SAO 196316[6]
Database references
SIMBADdata

Xi Columbae is a binary star[5] system in the southern constellation of Columba. With an apparent visual magnitude of 4.97,[2] it is faintly visible to the naked eye. Based upon an annual parallax shift of 10.1 mas,[1] it is located around 323 light years from the Sun. The system is a member of the HR 1614 supergroup,[7] and is drifting further away with a radial velocity of +59.5 km/s,[4]

This is an astrometric binary[8] with an orbital period of 1,420.6 days and an eccentricity of 0.39.[5] The primary is an evolved K-type giant star with a stellar classification of K1 III CNII,[3] showing an overabundance of CN in its spectrum. The star has expanded to 16 times the radius of the Sun and is radiating 120 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,743 K.[1] The companion has a mass of at least 59% that of the Sun.[5]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference houk1979 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Wilson1953 was invoked but never defined (see the help page).
  5. ^ a b c d e f Cite error: The named reference Setaiwan2004 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggen1997 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).