Alpha Chamaeleontis

α Chamaeleontis
Location of α Chamaeleontis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Chamaeleon[1]
Right ascension 08h 18m 31.552s[2]
Declination −76° 55′ 11.01″[2]
Apparent magnitude (V) 4.06[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type F5 V Fe−0.8[4]
U−B color index −0.04[3]
B−V color index +0.413±0.020[1]
Astrometry
Radial velocity (Rv)−13.4±0.5[5] km/s
Proper motion (μ) RA: 110.515 mas/yr[2]
Dec.: 107.125 mas/yr[2]
Parallax (π)51.3172±0.0981 mas[2]
Distance63.6 ± 0.1 ly
(19.49 ± 0.04 pc)
Absolute magnitude (MV)+2.59[1]
Details
Mass1.42[6] M☉
Radius2.40+0.05
−0.04[2] R☉
Luminosity7.53±0.03[2] L☉
Surface gravity (log g)4.28±0.14[6] cgs
Temperature5,866+9
−3[2] K
Metallicity [Fe/H]−0.26[4] dex
Rotational velocity (v sin i)0[7] km/s
Age1.8[6] Gyr
Other designations
α Cha, Alpha Cha, CPD−76°507, GJ 305, HD 71243, HIP 40702, HR 3318, SAO 256496[8]
Database references
SIMBADdata

Alpha Chamaeleontis is a solitary[9] star in the southern circumpolar constellation of Chamaeleon. Its name is a Bayer designation that is Latinized from α Chamaeleontis, and abbreviated Alpha Cha or α Cha. This star is bright enough to be seen with the naked eye with an apparent visual magnitude of 4.06.[3] With an annual parallax shift of 51.32 mas,[2] it is located 63.6 light years from the Sun. The star is drifting closer with a radial velocity of −13 km/s,[5] and is predicted to come to within 47 light-years in 666,000 years.[1]

This is an F-type main sequence star with a stellar classification of F5 V Fe−0.8,[4] where the 'Fe−0.8' notation indicates an anomalously low abundance of iron. It has an estimated 1.4 times the mass of the Sun,[6] 2.1 times the Sun's radius, and radiates 7.5 times the solar luminosity from its outer atmosphere at an effective temperature of 6,580 K.[2] The star is around 1.8[6] billion years old with a projected rotational velocity that is too low to be measured.[7] The star has been examined for an infrared excess that would suggest the presence of an orbiting debris disk, but none was found.[10]

References

  1. ^ a b c d 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. ^ a b c d e f g h i j 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. ^ a b c Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
  4. ^ a b c Gray, R. O.; et al. (2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal, 132 (1): 161–70, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  6. ^ a b c d e David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. ^ a b Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U.
  8. ^ "alf Cha", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2016-12-10
  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. ^ Gáspár, András; et al. (May 2013), "The Collisional Evolution of Debris Disks", The Astrophysical Journal, 768 (1): 29, arXiv:1211.1415, Bibcode:2013ApJ...768...25G, doi:10.1088/0004-637X/768/1/25, S2CID 119295265, 25.

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