Star in the constellation Lyra
HD 172044 is a triple star [ 11] system in the northern constellation of Lyra . It has a blue-white hue and is visible to the naked eye with an apparent visual magnitude of 5.41.[ 2] The distance to the primary component is approximately 535 light years based on parallax .[ 1] It is drifting closer with a radial velocity of −32.5 km/s, and is predicted to come as near as 77.3 light-years to the Sun some 4.5 million years from now.[ 2]
The dual nature of the primary star, component A, was announced in 1973 by H. A. Abt and M. A. Snowden . It is a single-lined spectroscopic binary with a preliminary orbital period of 4.59 years and an eccentricity (ovalness) of 0.16.[ 7] The visible component is a B-type bright giant with a stellar classification of B8IIpHgMn,[ 4] where the suffix notation indicates it is a chemically peculiar mercury-manganese star .[ 9]
Component B is a magnitude 9.40 companion of an unknown spectral type.[ 12] It was first reported by F. G. W. Struve in 1830. As of 2016, it has an angular separation of 7.2 arcseconds along a position angle of 204° from the brighter component.[ 3]
References
^ a b c d e f 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 f g h 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 .
^ a b Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog" . The Astronomical Journal . 122 (6): 3466–3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 .
^ a b Osawa, Kiyoteru (1959). "Spectral Classification of 533 B8-A2 Stars and the Mean Absolute Magnitude of A0 V Stars" . Astrophysical Journal . 130 : 159. Bibcode :1959ApJ...130..159O . doi :10.1086/146706 .
^ 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 .
^ a b c 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 Abt, Helmut A.; Snowden, Michael S. (February 1973). "The Binary Frequency for AP Stars". Astrophysical Journal Supplement . 25 : 137. Bibcode :1973ApJS...25..137A . doi :10.1086/190265 .
^ Hohle, M. M.; et al. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten . 331 (4): 349. arXiv :1003.2335 . Bibcode :2010AN....331..349H . doi :10.1002/asna.200911355 . S2CID 111387483 .
^ a b c d Ghazaryan, S.; et al. (2018). "New catalogue of chemically peculiar stars, and statistical analysis" . Monthly Notices of the Royal Astronomical Society . 480 (3): 2953–2962. arXiv :1807.06902 . Bibcode :2018MNRAS.480.2953G . doi :10.1093/mnras/sty1912 . S2CID 119062018 .
^ "HD 172044" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-01-25 .
^ 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 .
^ "HD 172044B" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2021-01-25 .
External links