Triple star system in the constellation Pavo
Xi Pavonis
Location of ξ Pavonis (circled)
Observation dataEpoch J2000 Equinox J2000
Constellation
Pavo
Right ascension
18h 23m 13.64610s [1]
Declination
−61° 29′ 37.9364″[1]
Apparent magnitude (V)
4.35[2]
Characteristics
Spectral type
K4III[3]
U−B color index
+1.55[4]
B−V color index
+1.46[2]
Astrometry Radial velocity (Rv ) +12.2± 0.9[5] km/sProper motion (μ) RA: −5.985[1] mas /yr Dec.: −0.538[1] mas /yr Parallax (π)7.3600 ± 0.3753 mas [1] Distance 440 ± 20 ly (136 ± 7 pc ) Absolute magnitude (MV )−1.16[2]
Orbit [6] Period (P)2,214 d Eccentricity (e)0.26 Periastron epoch (T)2,418,076.2 JD Argument of periastron (ω) (secondary)187.2° Semi-amplitude (K1 ) (primary)17.9 km/s
Details Radius 54.82+0.32 −3.92 [1] R ☉ Luminosity 729± 42[1] L ☉ Temperature 4,051+153 −117 [1] K
Other designations GLE 2,
ξ Pav ,
CPD −61°6140,
FK5 686,
GC 25045,
HD 168339,
HIP 90098,
HR 6855,
SAO 254226,
CCDM J18232-6130AB,
WDS J18232-6130AB[7]
Database references SIMBAD data
ξ Pavonis , Latinised as Xi Pavonis , is a triple star [8] system in the southern constellation of Pavo . It is visible to the naked eye as a faint star with a combined apparent visual magnitude of 4.35[2] The system is located approximately 440 light-years from the Sun based on parallax ,[1] and it is drifting further away with a radial velocity of +12 km/s.[5]
This system forms the double star GLE 2, whose companion's magnitude is 8.6 with a 3.3″ angular separation , which was discovered by Australian amateur astronomer Walter Gale [9] in 1894. The primary component is itself a single-lined spectroscopic binary [10] [11] with an orbital period of 6.06 years and an eccentricity of 0.26.[6] The visible member of this inner pair is an aging giant star with a stellar classification of K4III.[2]
References
^ a b c d e f g h i 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 .
^ a b c d e 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
^ Houk, Nancy (1978). Michigan catalogue of two-dimensional spectral types for the HD stars . Vol. 1. Ann Arbor: Dept. of Astronomy, University of Michigan. Bibcode :1975mcts.book.....H .
^ Mermilliod, J. C. (2006). "Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie . 2168 . Bibcode :2006yCat.2168....0M . Vizier catalog entry
^ a b Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication . Carnegie Institution of Washington . Bibcode :1953GCRV..C......0W . LCCN 54001336 .
^ a b Pourbaix, D.; et al. (2004). "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits" . Astronomy & Astrophysics . 424 : 727–732. arXiv :astro-ph/0406573 . Bibcode :2004A&A...424..727P . doi :10.1051/0004-6361:20041213 .
^ "ksi Pav" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-10-08 .
^ 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 .
^ Argyle, Bob (August 2008). "Double Star of the Month" . The Webb Deep-Sky Society . Retrieved 2019-10-08 .
^ Dommanget, J.; Nys, O. (2002). "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
^ Malkov, O. Yu.; Tamazian, V. S.; Docobo, J. A.; Chulkov, D. A. (2012). "Dynamical masses of a selected sample of orbital binaries" . Astronomy & Astrophysics . 546 : A69. Bibcode :2012A&A...546A..69M . doi :10.1051/0004-6361/201219774 . Vizier catalog entry