Chi Cancri

Chi Cancri, Latinized from χ Cancri, is a candidate astrometric binary[7] star system in the northern zodiac constellation of Cancer. It has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.14.[2] The system is located at a distance of 59 light years from the Sun, based on parallax, and is drifting further away with a radial velocity of +33 km/s.[4] It is estimated to have made its closest approach some 274,000 years ago when it came to within 42 light-years.[8]

Chi Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension  08h 20m 03.86070s[1]
Declination +27° 13′ 03.7464″[1]
Apparent magnitude (V) 5.14[2]
Characteristics
Evolutionary stage main sequence
Spectral type F6V[3]
U−B color index –0.06[2]
B−V color index +0.47[2]
Astrometry
Radial velocity (Rv)+32.91±0.08[4] km/s
Proper motion (μ) RA: –17.433[1] mas/yr
Dec.: –377.614[1] mas/yr
Parallax (π)54.8640 ± 0.1728[1] mas
Distance59.4 ± 0.2 ly
(18.23 ± 0.06 pc)
Absolute magnitude (MV)3.85[5]
Details[3]
Mass1.070 M☉
Radius1.3870±0.0276 R☉
Luminosity2.4378±0.0341 L☉
Surface gravity (log g)4.35[5] cgs
Temperature6,130±58 K
Metallicity [Fe/H]−0.26 dex
Rotational velocity (v sin i)4.2[5] km/s
Age5.8 Gyr
Other designations
χ Cnc, 18 Cancri, BD+27°1589, FK5 1217, GJ 303, HD 69897, HIP 40843, HR 3262, SAO 80104[6]
Database references
SIMBADdata

The visible component of this system is an F-type main-sequence star with a stellar classification of F6V,[3] where the luminosity class of 'V' indicates it is generating energy through core hydrogen fusion. The star is 5.8[3] billion years old and is spinning with a projected rotational velocity of just 4.2 km/s.[5] It has about the same mass as the Sun but 1.4 times the Sun's radius. Chi Cancri is radiating 2.4 times the luminosity of the Sun from its photosphere at an effective temperature of 6,130 K.[3] It displays an infrared excess in the 18μm wavelength band, suggesting a circumstellar disk of dusty debris is orbiting the star.[9]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99), Bibcode:1966CoLPL...4...99J.
  3. Boyajian, Tabetha S.; et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal, 771 (1): 40, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40.
  4. Nidever, David L.; et al. (August 2002), "Radial Velocities for 889 Late-Type Stars", The Astrophysical Journal Supplement Series, 141 (2): 503–522, arXiv:astro-ph/0112477, Bibcode:2002ApJS..141..503N, doi:10.1086/340570.
  5. Paunzen, E.; et al. (July 2014), "Investigating the possible connection between λ Bootis stars and intermediate Population II type stars", Astronomy & Astrophysics, 567: 8, arXiv:1406.3936, Bibcode:2014A&A...567A..67P, doi:10.1051/0004-6361/201423817, A67.
  6. "chi Cnc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-10-23.
  7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
  8. Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015.
  9. Ishihara, Daisuke; et al. (May 2017), "Faint warm debris disks around nearby bright stars explored by AKARI and IRSF", Astronomy & Astrophysics, 601: 18, arXiv:1608.04480, Bibcode:2017A&A...601A..72I, doi:10.1051/0004-6361/201526215, A72.
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