Lambda1 Phoenicis

λ1 Phoenicis, Latinized as Lambda1 Phoenicis, is a double star[10] in the southern constellation of Phoenix. It is visible to the naked eye as a faint, white-hued point of light with a combined apparent visual magnitude of 4.76.[2] The system is located approximately 183 light years away from the Sun based on parallax.[1] It is a member of the Hyades Supercluster.[11]

For other stars with this Bayer designation, see λ (lambda) Phoenicis.
λ1 Phoenicis
Location of λ1 Phoenicis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Phoenix
Right ascension 00h 31m 24.98200s[1]
Declination −48° 48′ 12.6759″[1]
Apparent magnitude (V) 4.76[2]
Characteristics
Spectral type A0Va[3]
U−B color index +0.04[4]
B−V color index +0.02[4]
Astrometry
Radial velocity (Rv)−2.0±4.2[5] km/s
Proper motion (μ) RA: +139.946[1] mas/yr
Dec.: +21.275[1] mas/yr
Parallax (π)17.8163 ± 0.2228[1] mas
Distance183 ± 2 ly
(56.1 ± 0.7 pc)
Absolute magnitude (MV)1.14[2]
Details
Mass2.26[6] M☉
Radius2.24[7] R☉
Luminosity33.68[2] L☉
Surface gravity (log g)4.17[6] cgs
Temperature9,931[6] K
Metallicity [Fe/H]0.00[8] dex
Rotational velocity (v sin i)111[6] km/s
Age224[6] Myr
Other designations
λ1 Phe, CD−49°115, FK5 15, GC 619, HD 2834, HIP 2472, HR 125, SAO 215131, CCDM J00314-4848A, WDS J00314-4848A[9]
Database references
SIMBADdata

The brighter component is an A-type main-sequence star with a stellar classification of A0Va.[3] It may form a binary system of two roughly equal stars.[10] An infrared excess suggests there is a debris disk orbiting 46.3 AU from the star with a mean temperature of 95 K.[7] It has one visual companion at an angular separation of about 30″ and magnitude 13.7.[12][13]

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. 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. S2CID 119257644. Vizier catalog entry
  3. Gray, R. O.; Garrison, R. F. (1987). "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation". The Astrophysical Journal Supplement Series. 65: 581. Bibcode:1987ApJS...65..581G. doi:10.1086/191237.
  4. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
  5. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 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. 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. Vizier catalog entry
  7. 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. S2CID 118438871. 15.
  8. Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771–782. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031. S2CID 118345778. Vizier catalog entry
  9. "lam01 Phe". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-09-23.
  10. 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.
  11. Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
  12. Dommanget, J.; Nys, O. (2002). "VizieR Online Data Catalog: CCDM (Catalog of Components of Double & Multiple stars) (Dommanget+ 2002)". VizieR On-line Data Catalog: I/274. Originally Published in: Observations et Travaux 54. 1274. Bibcode:2002yCat.1274....0D. Vizier catalog entry
  13. Mason, Brian D.; et al. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Vizier catalog entry
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