16 Vulpeculae

Binary star system in the constellation Vulpecula J2000.0 Vulpecula 20 02 01.43152 +24 56 16.9534 5.787 5.93 + 6.22 F2 III +0.37 +0.10 −37.00 3.7 89.31 69.44 14.71 0.50 2.47 1201 2.687 0.932 79.0 84.5 276.5 B 1863.7 16 Vul A 1.34 31.13 3.76 0.14 6888 234 commas 0.17 136.1 6.8 742 16 Vul +24° 3977 190004 98636 7657 88098 16+Vul 16 Vulpeculae is a binary star system in the northern constellation Vulpecula. It has a combined apparent visual magnitude of 5.787, which is near the lower limit of visibility to the naked eye. Based upon an annual parallax shift of 14.71 0.50 as seen from Earth's orbit, it is located about 222 light years away. The system is moving closer to the Sun with a heliocentric radial velocity of about −37 km/s. It will make its closest approach in about 0.9 million years, coming within 47.42 pc ly flip 3. The pair orbit each other with an estimated period of 1,201 years and an orbital eccentricity of 0.932. The magnitude 5.93 primary, component A, displays a stellar classification of F2III, matching an aging F-type giant star. This star is spinning rapidly with a projected rotational velocity of 136 km/s. This is giving the star an oblate shape with an equatorial bulge that is an estimated 21% larger than the polar radius. It is 742 million years old with 1.34 times the mass of the Sun. The star is radiating 31 times the Sun's luminosity from its photosphere at an effective temperature of about 6,888 K. References Validation of the new Hipparcos reduction van Leeuwen, F. etal Astronomy and Astrophysics 474 2 653–664 2007 0708.1752 2007A&A...474..653V 10.1051/0004-6361:20078357 18759600 Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished) Catalogue of Eggen's UBV Data 1986 1986EgUBV........0M The Tycho-2 catalogue of the 2.5 million brightest stars Høg, E. etal 2000 Astronomy and Astrophysics 355 L27–L30 2000A&A...355L..27H * 16 Vul 20 August 2017 http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 Sixth Catalog of Orbits of Visual Binary Stars United States Naval Observatory 24 August 2017 1 August 2017 https://web.archive.org/web/20170801102553/http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6 dead David Trevor J. Hillenbrand Lynne A. The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets The Astrophysical Journal 804 2 146 2015 2015ApJ...804..146D 10.1088/0004-637X/804/2/146 1501.03154 33401607 . Ammler-von Eiff Matthias Reiners Ansgar New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars? Astronomy & Astrophysics 1204.2459 542 A116 June 2012 . 10.1051/0004-6361/201118724 2012A&A...542A.116A 53666672 Interferometric observations of rapidly rotating stars Belle G. T. The Astronomy and Astrophysics Review 20 1 51 2012 10.1007/s00159-012-0051-2 2012A&ARv..20...51V 1204.2572 119273474 . 1 Casagrande L. Schönrich R. Asplund M. Cassisi S. Ramírez I. Meléndez J. Bensby T. Feltzing S. 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 21 2011 10.1051/0004-6361/201016276 2011A&A...530A.138C . 1103.4651 56118016 Eggleton P. P. Tokovinin A. A. A catalogue of multiplicity among bright stellar systems Monthly Notices of the Royal Astronomical Society 389 2 869–879 September 2008 10.1111/j.1365-2966.2008.13596.x free 2008MNRAS.389..869E 0806.2878 14878976 . XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters 38 5 331 2012 2012AstL...38..331A 10.1134/S1063773712050015 1108.4971 119257644 . Cowley Anne Fraquelli Dorothy MK Spectral Types for Some Bright F Stars Publications of the Astronomical Society of the Pacific 86 509 70 1974 10.1086/129562 1974PASP...86...70C free 1 Holmberg J. Nordström B. Andersen J. The Geneva-Copenhagen survey of the Solar neighbourhood. II. New uvby calibrations and rediscussion of stellar ages, the G dwarf problem, age-metallicity diagram, and heating mechanisms of the disk Astronomy & Astrophysics 475 2 519–537 2007 0707.1891 2007A&A...475..519H 10.1051/0004-6361:20077221 119054949 . Vulpeculae, 16 Category:Vulpecula Category:Binary stars Category:Durchmusterung objects 190004 098636 7657 Category:F2III stars