Gamma Chamaeleontis

γ Chamaeleontis
Location of γ Chamaeleontis (circled in red)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon
Right ascension 10h 35m 28.106s
Declination −78° 36′ 28.039″
Apparent magnitude (V) 4.12
Characteristics
Spectral type K5 III
U−B color index +1.94
B−V color index +1.580±0.320
Astrometry
Radial velocity (Rv)−22.4 km/s
Proper motion (μ) RA: −37.929 mas/yr
Dec.: +11.234 mas/yr
Parallax (π)7.3514±0.1416 mas
Distance444 ± 9 ly
(136 ± 3 pc)
Absolute magnitude (MV)−1.43
Details
Radius78+5
−3 R☉
Luminosity864 L☉
Surface gravity (log g)−0.24±0.12 cgs
Temperature3,870±39 K
Metallicity [Fe/H]−1.28±0.11 dex
Rotational velocity (v sin i)9.7±3.7 km/s
Other designations
γ Cha, CD−77°454, FK5 401, HD 92305, HIP 51839, HR 4174, SAO 256731
Database references
SIMBADdata

Gamma Chamaeleontis is a solitary star located in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from γ Chamaeleontis, and abbreviated Gamma Cha or γ Cha. This star can faintly be seen with the naked eye on a dark night, having an apparent visual magnitude of 4.12. Based upon an annual parallax shift of 7.35 mas, it is located around 444 light-years (136 pc) from the Sun. This star is drifting closer with a line of sight velocity component of −22 km/s.

This is an evolved K-type giant star with a stellar classification of K5 III. It is a suspected variable star, with an amplitude of 0.01 magnitude. With 78 times the radius of the Sun, this star radiates 864 times the solar luminosity from its enlarged outer atmosphere at an effective temperature of 3,870 K.

References

  1. 1 2 3 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 XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
  3. 1 2 3 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
  4. 1 2 Houk, N.; Cowley, A. P. (1975), "Catalogue of two-dimensional spectral types for the HD stars", University of Michigan, I, Bibcode:1975mcts.book.....H.
  5. 1 2 Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veröff. Astronomisches Rechen-Institut Heidelb, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W.
  6. 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  7. 1 2 3 4 5 Borisov, S. B.; et al. (2023), "New Generation Stellar Spectral Libraries in the Optical and Near-infrared. I. The Recalibrated UVES-POP Library for Stellar Population Synthesis", The Astrophysical Journal Supplement Series, 266 (1): 11, arXiv:2211.09130, Bibcode:2023ApJS..266...11B, doi:10.3847/1538-4365/acc321.
  8. ↑ "gam Cha", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2016-12-11.
  9. ↑ 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, S2CID 14878976.
  10. ↑ Eggen, O. J. (1973), "The classification of intrinsic variables. IV. Very-small-amplitude, very-short-period red variables", Astrophysical Journal, 184: 793, Bibcode:1973ApJ...184..793E, doi:10.1086/152371.