Chi Andromedae (χ Andromedae, χ And) is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of +5.01,[2] which is relatively faint for a naked-eye star. Based upon parallax measurements made during the Gaia mission, Chi Andromedae is located around 264 light-years (81 parsecs) from Earth.[1]
Star in the constellation Andromeda
This article is about χ Andromedae. It is not to be confused with X Andromedae or Andromeda X.
This is most likely a spectroscopic binary system with an estimated orbital period of 20.8 years and an eccentricity of 0.37. The primary component has a stellar classification of G8III,[6] which indicates it is a giant star that has exhausted the supply of hydrogen at its core and evolved away from the main sequence. The outer envelope has expanded to about nine times the radius of the Sun and it is radiating 47[5] times the luminosity of the Sun at an effective temperature of 5,070K.[5] This heat gives the star the yellow-hued glow of a G-type star.[9] It appears to be rotating very slowly with no measurable projected rotational velocity.[5] The secondary component seems to be a main-sequence star of the spectral class G or K.[6]
Massarotti, Alessandro; etal. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
Griffin, R. F. (June 1998), "Spectroscopic binary orbits from photoelectric radial velocities. Paper 140: Chi Andromedae", The Observatory, 118: 158–165, Bibcode:1998Obs...118..158G.
"* chi And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-06-25.
"The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2012-03-18, retrieved 2012-01-16.
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