13 Delphini
Double star in the constellation Delphinus
13 Delphini is a binary star [2] in the equatorial constellation Delphinus , with a combined apparent magnitude of 5.64.[12] The system is located at a distance of 471 light years but is approaching the Solar System with a heliocentric radial velocity of about −7 km/s .[6]
13 Delphini A has an apparent magnitude of 5.66, while its companion has an apparent magnitude of 8.51.[2] As of 2016, the pair have a separation of 1.5″ located at a position angle of 200° .[13]
13 Delphini has a blended stellar classification of A0 V,[4] indicating that it is an ordinary A-type main-sequence star . However, when the components are analysed individually, the primary star is given a class of B9V.[14] It has 2.51 times the mass of the Sun [9] and has an effective temperature of 9,840 K .[3] However, the star is large for its class, having a radius almost 4 times that of the Sun [9] and a luminosity 119 times greater.[3] This is due to 13 Delphini having completed 86.1% of its main sequence lifetime[3] and has led one source to classify it as a subgiant instead.[15] It spins rapidly with a projected rotational velocity of 170 km/s [11] and has an age of 307 million years .[10]
References
^ a b c d e f 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 c d 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 .
^ a b c d e f Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities" . Astronomy and Astrophysics . 537 : A120. arXiv :1201.2052 . Bibcode :2012A&A...537A.120Z . doi :10.1051/0004-6361/201117691 . ISSN 0004-6361 . S2CID 55586789 .
^ a b Paunzen, E.; Duffee, B.; Heiter, U.; Kuschnig, R.; Weiss, W. W. (July 2001). "A spectroscopic survey for λ Bootis stars" . Astronomy & Astrophysics . 373 (2). EDP Sciences: 625–632. Bibcode :2001A&A...373..625P . doi :10.1051/0004-6361:20010630 . ISSN 0004-6361 .
^ a b Cousins, A. W. J. (1971). "Photometric standard stars". Royal Observatory Annals . 7 : 86. Bibcode :1971ROAn....7.....C .
^ 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 255204555 .
^ a b 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 c d e 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 Gontcharov, G. A. (December 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 . ISSN 0320-0108 . S2CID 255201789 .
^ a b Royer, F.; Zorec, J.; Gómez, A. E. (23 November 2006). "Rotational velocities of A-type stars" . Astronomy & Astrophysics . 463 (2): 671–682. arXiv :astro-ph/0610785 . Bibcode :2007A&A...463..671R . doi :10.1051/0004-6361:20065224 . eISSN 1432-0746 . ISSN 0004-6361 .
^ Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002-03-01). "The Tycho double star catalogue" . Astronomy and Astrophysics . 384 : 180–189. Bibcode :2002A&A...384..180F . doi :10.1051/0004-6361:20011822 . ISSN 0004-6361 .
^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (December 2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog" . The Astronomical Journal . 122 (6): 3466–3471. Bibcode :2001AJ....122.3466M . doi :10.1086/323920 . ISSN 0004-6256 .
^ Palmer, D. R.; Walker, E. N.; Jones, D. H. P.; Wallis, R. E. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Greenwich Observatory Bulletins . 135 : 385. Bibcode :1968RGOB..135..385P .
^ Abt, Helmut A.; Morrell, Nidia I. (July 1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars" . The Astrophysical Journal Supplement Series . 99 : 135. Bibcode :1995ApJS...99..135A . doi :10.1086/192182 . ISSN 0067-0049 .