HD 194012
Star in the constellation Delphinus
HD 194012 (HR 7793; Gliese 789 ) is a star in the equatorial constellation Delphinus . It has an apparent magnitude of 6.15,[2] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years [1] but is receding with a heliocentric radial velocity of 4.5 km/s .[5]
HD 194012 has a stellar classification of F7 V,[3] indicating that it is an ordinary F-type main-sequence star . It has 121% the mass of the Sun [7] and is estimated to be a billion years old,[11] spinning with a projected rotational velocity of 5 km/s .[10] The star's diameter is 118% that of the Sun [7] and shines with a luminosity of 1.9 L ☉ [8] from its photosphere at an effective temperature of 6,301 K ,[9] giving a yellow white hue. HD 194012's metallicity is calculated to be 87% that of the Sun.[8]
A 2010 paper has identified a candidate substellar companion 12.78″ away along a position angle of 67.9° .[13] HD 194012 has been examined for infrared excess suggesting a debris disk but none was found.[14]
References
^ a b c d e Brown, A. G. A. ; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties" . Astronomy & Astrophysics . 649 : A1. arXiv :2012.01533 . Bibcode :2021A&A...649A...1G . doi :10.1051/0004-6361/202039657 . S2CID 227254300 . (Erratum: doi :10.1051/0004-6361/202039657e ) . Gaia EDR3 record for this source at VizieR .
^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27–L30. Bibcode :2000A&A...355L..27H . ISSN 0004-6361 .
^ a b Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (October 2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I." The Astronomical Journal . 126 (4): 2048–2059. arXiv :astro-ph/0308182 . Bibcode :2003AJ....126.2048G . doi :10.1086/378365 . eISSN 1538-3881 . ISSN 0004-6256 .
^ a b Marlborough, J. M. (March 1964). "Frequency of ultraviolet excess among late-type dwarfs in the solar neighbourhood" . The Astronomical Journal . 69 : 215. Bibcode :1964AJ.....69..215M . doi :10.1086/109258 . ISSN 0004-6256 .
^ a b Gontcharov, G. A. (November 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 . ISSN 1063-7737 . S2CID 119231169 .
^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331–346. arXiv :1108.4971 . Bibcode :2012AstL...38..331A . doi :10.1134/S1063773712050015 . ISSN 1063-7737 . S2CID 119257644 .
^ a b c d Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List" . The Astronomical Journal . 158 (4): 138. arXiv :1905.10694 . Bibcode :2019AJ....158..138S . doi :10.3847/1538-3881/ab3467 . ISSN 0004-6256 .
^ a b c d e Luck, R. Earle (21 December 2016). "Abundances in the Local Region. II. F, G, and K Dwarfs and Subgiants" . The Astronomical Journal . 153 (1): 21. arXiv :1611.02897 . Bibcode :2017AJ....153...21L . doi :10.3847/1538-3881/153/1/21 . eISSN 1538-3881 .
^ a b Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s): Improved astrophysical parameters for the Geneva-Copenhagen Survey⋆" . Astronomy & Astrophysics . 530 : A138. arXiv :1103.4651 . Bibcode :2011A&A...530A.138C . doi :10.1051/0004-6361/201016276 . ISSN 0004-6361 .
^ a b Kraft, Robert P. (November 1967). "Studies of Stellar Rotation. V. The Dependence of Rotation on Age among Solar-Type Stars" . The Astrophysical Journal . 150 : 551. Bibcode :1967ApJ...150..551K . doi :10.1086/149359 . eISSN 1538-4357 . ISSN 0004-637X .
^ a b Demarque, Pierre; Woo, Jong‐Hak; Kim, Yong‐Cheol; Yi, Sukyoung K. (December 2004). "Y 2 Isochrones with an Improved Core Overshoot Treatment" . The Astrophysical Journal Supplement Series . 155 (2): 667–674. arXiv :astro-ph/0409024 . Bibcode :2004ApJS..155..667D . doi :10.1086/424966 . ISSN 1538-4357 .
^ "HD 194012" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved June 16, 2022 .
^ Tanner, Angelle M.; Gelino, Christopher R.; Law, Nicholas M. (October 2010). "A High-Contrast Imaging Survey ofSIM Lite Planet Search Targets" . Publications of the Astronomical Society of the Pacific . 122 (896): 1195–1206. arXiv :1007.4315 . Bibcode :2010PASP..122.1195T . doi :10.1086/656481 . eISSN 1538-3873 . ISSN 0004-6280 .
^ Gáspár, András; Rieke, George H.; Ballering, Nicholas (29 July 2016). "The Correlation Between Metallicity and Debris Disk Mass" . The Astrophysical Journal . 826 (2): 171. arXiv :1604.07403 . Bibcode :2016ApJ...826..171G . doi :10.3847/0004-637X/826/2/171 . eISSN 1538-4357 .