Binary star system in the constellation Vulpecula
26 Vulpeculae is a close binary star system in the northern constellation of Vulpecula , around 644 light years away from the Sun. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.40. The star is moving closer to the Earth with a heliocentric radial velocity of −63 km/s, and is expected to come within 225 light-years in around 2.6 million years.
This is a single-lined spectroscopic binary with an orbital period of 11 days and an eccentricity of 0.28. The visible component is a suspected chemically peculiar star with a stellar classification of A5 III, suggesting this is an evolved giant star . It has about 4.6 times the Sun's radius and is radiating 80 times the Sun's luminosity from its photosphere at an effective temperature of 7,888 K.
References
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^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics , 367 (Third ed.): 521–524, arXiv :astro-ph/0012289 , Bibcode :2001A&A...367..521P , doi :10.1051/0004-6361:20000451 , S2CID 425754 .
^ McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society , 427 (1): 343–357, arXiv :1208.2037 , Bibcode :2012MNRAS.427..343M , doi :10.1111/j.1365-2966.2012.21873.x , S2CID 118665352 .
Royer, F.; et al. (October 2002), "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i", Astronomy and Astrophysics , 393 (3): 897–911, arXiv :astro-ph/0205255 , Bibcode :2002A&A...393..897R , doi :10.1051/0004-6361:20020943 , S2CID 14070763 .
^ "26 Vul" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2019-03-17.
Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars" , Astronomy and Astrophysics , 498 (3): 961–966, Bibcode :2009A&A...498..961R , doi :10.1051/0004-6361/200810788 .
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