Kappa Phoenicis

κ Phoenicis, Latinized as Kappa Phoenicis, is a single[9] star in the southern constellation of Phoenix. It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.94.[2] The distance to this star is approximately 77.7 light years based on parallax,[1] and it is drifting further away with a radial velocity of +11 km/s.[4] It is a member of the Castor Moving Group of co-moving stars.[10]

Kappa Phoenicis
Location of κ Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 00h 26m 12.20183s[1]
Declination −43° 40′ 47.3929″[1]
Apparent magnitude (V) 3.94[2]
Characteristics
Spectral type A5IVn[3]
U−B color index +0.11[2]
B−V color index +0.17[2]
Astrometry
Radial velocity (Rv)+11.30[4] km/s
Proper motion (μ) RA: +106.20[1] mas/yr
Dec.: +32.15[1] mas/yr
Parallax (π)42.00 ± 0.15[1] mas
Distance77.7 ± 0.3 ly
(23.81 ± 0.09 pc)
Absolute magnitude (MV)2.05[3]
Details
Mass1.74[5] M☉
Radius2.03+0.10
−0.19[6] R☉
Luminosity10.7±0.1[6] L☉
Surface gravity (log g)4.30[5] cgs
Temperature7,320+369
−176[6] K
Metallicity [Fe/H]-0.04[3] dex
Rotational velocity (v sin i)245.0[7] km/s
Age348[5] Myr
Other designations
κ Phe, CD−44°101, GC 516, GJ 20, HD 2262, HIP 2072, HR 100, SAO 215092[8]
Database references
SIMBADdata
ARICNSdata

This object has a stellar classification of A5IVn,[3] which matches the spectrum of an A-type subgiant star with "nebulous" lines due to rapid rotation. It is 348[5] million years old and is spinning with a projected rotational velocity of 245 km/s.[7] The star has 1.7[5] times the mass of the Sun and 2.0[6] times the Sun's radius. It is radiating 10.7[6] times the luminosity of the Sun from its photosphere at an effective temperature of 7,320 K.[6] The star displays an infrared excess that matches the signature of a debris disk orbiting 9 AU from the host star with a temperature of 170 K.[11]

References
  1. Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. Ducati, J. R. (2002). "VizieR On-line Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  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. Vizier catalog entry
  4. Evans, D. S. (1967). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
  5. 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. Vizier catalog entry
  6. 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.
  7. Glebocki, R.; Gnacinski, P. (2005). "Catalog of Stellar Rotational Velocities". VizieR On-line Data Catalog: III/244. Originally Published in: 2005csss...13..571G. 3244. Bibcode:2005yCat.3244....0G. Vizier catalog entry
  8. "kap Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-13.
  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.
  10. Vereshchagin, S. V.; Chupina, N. V. (2015). "Details of the spatial structure and kinematics of the Castor and Ursa Major streams". Baltic Astronomy. 24: 421–425. arXiv:1603.03159. Bibcode:2015BaltA..24..421V. doi:10.1515/astro-2017-0244.
  11. Cotten, Tara H.; Song, Inseok (July 2016). "A Comprehensive Census of Nearby Infrared Excess Stars". The Astrophysical Journal Supplement Series. 225 (1): 24. arXiv:1606.01134. Bibcode:2016ApJS..225...15C. doi:10.3847/0067-0049/225/1/15. 15.
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