17 Lyrae

Star in the constellation Lyra 17 Lyrae AB Lyra constellation map.svg center 240 right Red circle.svg 8 17 Lyr 283 904 Location of 17 Lyrae (circled) J2000.0 Lyra AB 19 07 25.58012 +32 30 6.2599 5.221 A 19 07 25.58 +32 30 06.3 5.26 B 19 07 25.31 +32 30 07.5 9.1 F0V +0.351 +0.044 A +114.276 +18.316 22.8557 0.0782 B +120.597 +9.110 22.8407 0.0190 A 42.857 days 0.0 13.10 A 1.6 6,887 16.4 2.5 0.0 138 3.57 1.4 B 0.73 5,266 −0.46 4.61 17 Lyrae, HR 7261, BD+32°3326, HD 178449, SAO 67835, HIP 93917, GC 26340, CCDM J19075+3231, IDS 19036+3221 17+Lyrae 17 Lyrae is a multiple star system in the constellation Lyra, 143 light years away from Earth. Components The 17 Lyrae system contains two visible components, designated A and B, separated by 2.48" in 1997. The primary star is a single-lined spectroscopic binary with a period of 42.9 days. There was once thought to be a fourth star in the system, the red dwarf binary Kuiper 90, designated 17 Lyrae C, until it was evident that the star's parallax and proper motions were too different for it to be part of the system. The separation between 17 Lyrae AB and C is increasing rapidly, from less than 2' in 1881 to nearly 5' in 2014. A number of other visual companions have been catalogued. The closest is the 11th magnitude star at 39", and the brightest is BD+32 3325 just over 2' away. Properties The primary component, 17 Lyrae A, is a 5th magnitude main sequence star of the spectral type F0, meaning it has a surface temperature of about 6,750 K. It is about 60% more massive than the sun and 16 times more luminous. It has been catalogued as an Am star but is now believed to be a relatively normal quickly-rotating star. The visible companion 17 Lyrae B is a 9th magnitude star of an unknown spectral type. The spectroscopic companion cannot be detected in the spectrum and its properties are uncertain. Faint sharp spectral lines contrasting with the broadened lines of the primary may originate in a shell of material around the stars. References 2042936967135806848 2042936967130460032 2022yCat.1354....0A VizieR Online Data Catalog: StarHorse2, Gaia EDR3 photo-astrometric distances (Anders+, 2022) Anders F. Khalatyan A. Queiroz A. B. A. Chiappini C. Ardevol J. Casamiquela L. Figueras F. Jimenez-Arranz O. Jordi C. Monguio M. Romero-Gomez M. Altamirano D. Antoja T. Assaad R. Cantat-Gaudin T. Castro-Ginard A. Enke H. Girardi L. Guiglion G. Khan S. Luri X. Miglio A. Minchev I. Ramos P. Santiago B. X. Steinmetz M. Vizier Online Data Catalog 2022 2003MNRAS.346...27B Abundance analysis of Am binaries and search for tidally driven abundance anomalies - I. HD 33254, HD 178449 and HD 198391 Monthly Notices of the Royal Astronomical Society 346 27–36 Budaj J Iliev I. Kh 2003 1 10.1046/j.1365-2966.2003.07071.x free Slocum, Frederick The parallax of 17 Lyrae C (abstract) Popular Astronomy 1929 37 328 1929PA.....37..328S 2007A&A...474..653V Validation of the new Hipparcos reduction Astronomy and Astrophysics 474 2 653–664 Van Leeuwen F 2007 10.1051/0004-6361:20078357 free 0708.1752 18759600 2000A&A...355L..27H The Tycho-2 catalogue of the 2.5 million brightest stars Astronomy and Astrophysics 355 L27 Høg E Fabricius C Makarov V. V Urban S Corbin T Wycoff G Bastian U Schwekendiek P Wicenec A 2000 http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5a1ef5de113c&-out.add=.&-source=I/274/ccdm&recno=85112 CCDM Vizier entry 2017-11-29 http://vizier.u-strasbg.fr/viz-bin/VizieR-5?-ref=VIZ5a1ef5de113c&-out.add=.&-source=I/274/ccdm&recno=85113 CCDM Vizier entry 2017-11-29 1974PASP...86...70C MK Spectral Types for Some Bright F Stars Publications of the Astronomical Society of the Pacific 86 70 Cowley Anne Fraquelli Dorothy 1974 509 10.1086/129562 free 2011A&A...525A..26D The mass ratio and initial mass functions in spectroscopic binaries Astronomy and Astrophysics 525 A26 Ducati J. R Penteado E. M Turcati R 2011 10.1051/0004-6361/200913895 free 10183/99264 free 2007ApJ...658.1289T astro-ph/0612029 Debris disks in main-sequence binary systems The Astrophysical Journal 658 2 1289–1311 Trilling D. E Stansberry J. A Stapelfeldt K. R Rieke G. H Su K. Y. L Gray R. O Corbally C. J Bryden G Chen C. H Boden A Beichman C. A 2007 10.1086/511668 14867168 2012A&A...537A.120Z Rotational velocities of A-type stars. IV. Evolution of rotational velocities Astronomy & Astrophysics 537 A120 Zorec J Royer F 2012 10.1051/0004-6361/201117691 free 1201.2052 55586789 2001AJ....122.3466M The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog The Astronomical Journal 122 6 3466 Mason Brian D Wycoff Gary L Hartkopf William I Douglass Geoffrey G Worley Charles E 2001 10.1086/323920 free External links Study of 17 Lyrae (in Spanish) 17 Lyrae in color https://web.archive.org/web/20091130014433/http://homepage.univie.ac.at/peter.wienerroither/pwafods/19074+3230.htm 2009-11-30 Category:Spectroscopic binaries Category:Lyra 178449 Lyrae, 17 093917 7261 Category:Durchmusterung objects Category:Am stars Category:F0V stars