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Star in the constellation Vulpecula
4 Vulpeculae is a single, orange-hued star in the northern constellation of Vulpecula . It forms part of the asterism , formerly thought to be an open cluster , called the coathanger or Brocchi's Cluster . The star is faintly visible to the naked eye with an apparent visual magnitude of 5.16. The distance to this star, based upon an annual parallax shift of 12.5320±0.1008 mas , is around 260 light years .
At the age of about 2.6 billion years old, this is an aging giant star with a stellar classification of K0 III, having exhausted the supply of hydrogen at its core and evolved off the main sequence . It is now a red clump giant, indicating that it is on the horizontal branch and is generating energy through the fusion of helium at its core. The star has an estimated 1.72 times the mass of the Sun and has expanded to 11.42 times the Sun's radius . It is radiating 67.6 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,763 K.
References
^ Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties" . Astronomy & Astrophysics 616 . A1. arXiv :1804.09365 . Bibcode :2018A&A...616A...1G . doi :10.1051/0004-6361/201833051 .Gaia DR2 record for this source at VizieR .
^ Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal , 150 (3), 88, arXiv :1507.01466 , Bibcode :2015AJ....150...88L , doi :10.1088/0004-6256/150/3/88 , S2CID 118505114 .
Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters , 38 (5): 331, arXiv :1108.4971 , Bibcode :2012AstL...38..331A , doi :10.1134/S1063773712050015 , S2CID 119257644 .
^ Soubiran, C.; et al. (June 2010), "The PASTEL catalogue of stellar parameters", Astronomy and Astrophysics , 515 : A111, arXiv :1004.1069 , Bibcode :2010A&A...515A.111S , doi :10.1051/0004-6361/201014247 , S2CID 118362423 .
Massarotti, Alessandro; et al. (2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos giants and the role of binarity", The Astronomical Journal , 135 (1): 209–231, Bibcode :2008AJ....135..209M , doi :10.1088/0004-6256/135/1/209 .
"4 Vul" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2018-04-05.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 .
Kaler, James B., "The Coathanger, A Non-Cluster" , Stars , University of Illinois, retrieved 2018-04-07.
Baumgardt, H. (December 1998), "The nature of some doubtful open clusters as revealed by HIPPARCOS", Astronomy and Astrophysics , 340 : 402−414, Bibcode :1998A&A...340..402B .
Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal , 539 (2): 732–741, arXiv :astro-ph/0003329 , Bibcode :2000ApJ...539..732A , doi :10.1086/309278 , S2CID 16673121 .
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