Kappa Chamaeleontis

Kappa Chamaeleonitis, Latinized from κ Chamaeleonitis, is a single[8] star in the southern constellation of Chamaeleon. It is visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.024.[2] The distance to this object is approximately 490 light-years, based on the star's parallax.[1] It is drifting closer with a radial velocity of -2 km/s.[3]

Kappa Chamaeleontis
Observation data
Epoch J2000      Equinox J2000
Constellation Chamaeleon
Right ascension 12h 04m 46.47090s[1]
Declination −76° 31′ 08.6272″[1]
Apparent magnitude (V) 5.024[2]
Characteristics
Spectral type K4III[3]
U−B color index +1.78[4]
B−V color index +1.49[4]
Astrometry
Radial velocity (Rv)−2.19±0.19[3] km/s
Proper motion (μ) RA: -77.805[1] mas/yr
Dec.: 45.837[1] mas/yr
Parallax (π)6.6724 ± 0.1927[1] mas
Distance490 ± 10 ly
(150 ± 4 pc)
Absolute magnitude (MV)−0.78[5]
Details
Mass1.4[6] M☉
Radius46.12[1] R☉
Luminosity485.7[1] L☉
Temperature3,990[1] K
Rotational velocity (v sin i)<1.0[3] km/s
Other designations
κ Cha, CPD−75°777, HD 104902, HIP 58905, HR 4605, SAO 256899[7]
Database references
SIMBADdata

This is an aging K-type giant star with a stellar classification of K4III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded to its current size of 46[1] times the Sun's radius. It is a candidate periodic microvariable, with its brightness fluctuating by 0.005 magnitude at the rate of 0.25664 cycles per day.[9] The star is 1.4[6] times as massive as the Sun and is radiating 486 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,990 K.[1]

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. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. de Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762.
  4. Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  5. 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.
  6. Chandler, Colin Orion; et al. (2016). "The Catalog of Earth-Like Exoplanet Survey Targets (CELESTA): A Database of Habitable Zones Around Nearby Stars". The Astronomical Journal. 151 (3): 59. arXiv:1510.05666. Bibcode:2016AJ....151...59C. doi:10.3847/0004-6256/151/3/59.
  7. "kap Cha". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-11.
  8. Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  9. Koen, Chris; Eyer, Laurent (2002). "New periodic variables from the Hipparcos epoch photometry". Monthly Notices of the Royal Astronomical Society. 331: 45. arXiv:astro-ph/0112194. Bibcode:2002MNRAS.331...45K. doi:10.1046/j.1365-8711.2002.05150.x.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.