Star in the constellation Hercules
52 Herculis is atriple star[7][4] system in the northernconstellation ofHercules. It is visible to the naked eye as a faint point of light with a combinedapparent visual magnitude of 4.82.[3] Based uponparallax measurements, the system is located 180 light years away from the Sun. It is moving closer to the Earth with a heliocentricradial velocity of −1.6 km/s.[3]
The primary member, designated component A, is a magnetic[10]chemically peculiar star[8] with astellar classification of A1VpSiSrCr,[5] appearing as anA-type main-sequence star with abnormal abundances of silicon, strontium, and chromium. It is analpha2 Canum Venaticorum variable that ranges in brightness from visual magnitude 4.78 down to 4.85 with a period of 3.8567 days.[6] The star is about 525 million years old with aprojected rotational velocity of 23 km/s. It has 2.2 times themass of the Sun and 2.3 times theSun's radius. The star is radiating 29.5 times theSun's luminosity from itsphotosphere at aneffective temperature of 8,840 K.[8]
The remaining components form abinary star system with anorbital period of 56 years, an angularsemimajor axis of0.279″, and aneccentricity of 0.13.[7] They have anangular separation of1.78″ from the primary.[4] The total mass of the pair is1.16±0.09 M☉[7] and they have a combined visual magnitude of 8.85.[4] The brighter member of this pair is a suspectedK-type main-sequence star with a class of K0V.
- ^"MAST: Barbara A. Mikulski Archive for Space Telescopes". Space Telescope Science Institute. Retrieved28 November 2022.
- ^abcdevan Leeuwen, F. (2007), "Validation of the new Hipparcos reduction",Astronomy and Astrophysics,474 (2):653–664,arXiv:0708.1752,Bibcode:2007A&A...474..653V,doi:10.1051/0004-6361:20078357,S2CID 18759600.
- ^abcdeAnderson, 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.
- ^abcdefEggleton, 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.
- ^abAbt, H. A. (1981), "Visual multiples. VII - MK classifications",The Astrophysical Journal Supplement Series,45: 437,Bibcode:1981ApJS...45..437A,doi:10.1086/190719.
- ^abSamus, N. N.; et al. (2017), "General Catalogue of Variable Stars",Astronomy Reports, 5.1,61 (1):80–88,Bibcode:2017ARep...61...80S,doi:10.1134/S1063772917010085,S2CID 125853869.
- ^abcdeDe Rosa, R. J.; et al. (2012), "The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples",Monthly Notices of the Royal Astronomical Society,422 (4): 2765,arXiv:1112.3666,Bibcode:2012MNRAS.422.2765D,doi:10.1111/j.1365-2966.2011.20397.x,S2CID 102487103.
- ^abcSikora, J.; et al. (February 2019), "A Volume-Limited Survey of mCP Stars Within 100pc I: Fundamental Parameters and Chemical Abundances",Monthly Notices of the Royal Astronomical Society,483 (2):2300–2324,arXiv:1811.05633,Bibcode:2019MNRAS.483.2300S,doi:10.1093/mnras/sty3105,S2CID 119089236.
- ^"52 Her".SIMBAD.Centre de données astronomiques de Strasbourg. Retrieved2019-06-14.
- ^Bychkov, V. D.; et al. (April 2012), "Magnetic field of the Ap star 52 Her",Astrophysical Bulletin,67 (2):207–215,Bibcode:2012AstBu..67..207B,doi:10.1134/S199034131202006X,S2CID 120468594
