19 Lyrae

Star in the constellation Lyra 250px A light curve for 19 Lyrae, plotted from TESS data J2000.0 Lyra 19 11 46.008 +31 17 00.44 5.93 B8 IIIp Si Sr −0.062 0.004 α2 CVn −30.1 2.9 −4.143 −2.763 3.4213 0.0417 −1.24 3.76 0.22 6.40 397.48 11194 501 479 commas 35 19 Lyr V471 Lyr 11806 +31°3497 3532 26459 179527 94311 7283 67946 19+Lyr 19 Lyrae is a single variable star located approximately 950 light years away from the Sun in the northern constellation of Lyra. It has the variable star designation V471 Lyr, while 19 Lyrae is the Flamsteed designation. This object is just bright enough to be visible to the naked eye, appearing as a dim, blue-white star with a baseline apparent visual magnitude of 5.93. It is moving closer to the Earth with a heliocentric radial velocity of −30 km/s, and may come as close as 51.12 pc ly 0 out off around 8.5 million years from now. This is a magnetic chemically-peculiar star with a stellar classification of B8 IIIp Si Sr, showing abundance anomalies in silicon and strontium. The light variations of this star were discovered by J. E. Winzer in 1974. It is an Alpha2 Canum Venaticorum-type variable with a period of 1.160898 days (or 7.0980 days), ranging in magnitude from a high of 5.91 down to 5.98. The surface magnetic field has a strength of 111.3 56.9 −4 T 19 Lyrae has a moderate rotation rate, showing a projected rotational velocity of 35 km/s. Stellar models give it an estimated 3.8 times the mass of the Sun and its girth is measured at 6.4 times the Sun's radius. It is radiating 397 times the luminosity of the Sun from its photosphere at an effective temperature of around 11,194 K. The star has an absolute magnitude of −1.24, which shows how bright the star would appear if it were located at a distance of 10 pc ly from the Sun. References 30em 2042565400924276736 19 Lyr 2019-05-30 . MAST: Barbara A. Mikulski Archive for Space Telescopes https://mast.stsci.edu/portal/Mashup/Clients/Mast/Portal.html Space Telescope Science Institute 8 December 2021 Abt Helmut A. Morrell Nidia I. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars Astrophysical Journal Supplement 99 135 1995 1995ApJS...99..135A 10.1086/192182 free A catalogue of multiplicity among bright stellar systems Eggleton P. P. Tokovinin A. A. Monthly Notices of the Royal Astronomical Society 389 2 869 2008 10.1111/j.1365-2966.2008.13596.x free 0806.2878 2008MNRAS.389..869E 14878976 . 1 Shulyak D. Paladini C. Causi G. Li Perraut K. Kochukhov O. Interferometry of chemically peculiar stars: Theoretical predictions versus modern observing facilities Monthly Notices of the Royal Astronomical Society 443 2 1629 2014 2014MNRAS.443.1629S 1406.6093 10.1093/mnras/stu1259 free . 1 Abt Helmut A. Levato Hugo Grosso Monica Rotational Velocities of B Stars The Astrophysical Journal 573 1 359–365 July 2002 10.1086/340590 2002ApJ...573..359A free XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters . 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 An Investigation of the Rotational Properties of Magnetic Chemically Peculiar Stars Martin Netopil Ernst Paunzen Stefan Huemmerich Klaus Bernhard Monthly Notices of the Royal Astronomical Society 1 468 2745–2756 July 2017 3 . 2017MNRAS.468.2745N 1703.05218 10.1093/mnras/stx674 free Kochukhov O. Bagnulo S. Evolutionary state of magnetic chemically peculiar stars Astronomy and Astrophysics 450 2 763 2006 2006A&A...450..763K 10.1051/0004-6361:20054596 astro-ph/0601461 18596834 1 Samus N. N. Kazarovets E. V. Durlevich O. V. Kireeva N. N. Pastukhova E. N. General Catalogue of Variable Stars 5.1 Astronomy Reports 2017 61 1 80–88 2017ARep...61...80S . 10.1134/s1063772917010085 125853869 1 Bychkov V. D. Bychkova L. V. Madej J. Catalogue of averaged stellar effective magnetic fields - II. Re-discussion of chemically peculiar A and B stars Monthly Notices of the Royal Astronomical Society 394 3 1338 2009 . 10.1111/j.1365-2966.2008.14227.x 2009MNRAS.394.1338B 120268049 free UVBY photometry of the mCP stars HD 35298, 19 Lyrae, HD 192678, and HR 8216 Adelman S. J. Rice R. H. Astronomy and Astrophysics Supplement . 136 111–115 April 1999 10.1051/aas:1999202 1999A&AS..136..111A free Category:B-type giants Category:Alpha2 Canum Venaticorum variables Category:Magnetic chemically peculiar stars Category:Lyra 7283 Category:Durchmusterung objects Lyrae, 19 179527 094311 Lyrae, V471