111 Herculis

Star in the constellation Hercules Hercules constellation map.svg center 280 right Red circle.svg 10 111 Herculis 108 788 Location of 111 Herculis (circled in red) J2000 Hercules 18 47 01.23431 +21 46 53.4578 4.34 main sequence A3Va+ 0.148 0.003 −44.6 2.7 +98.835 +115.120 34.9987 0.1743 2.04 2.40 1.6 8873 302 commas 12.84 4.35 0.33 71 559 111 Her +18°3823 1491 173880 92161 7069 104093 J18470+1811 111+Her 111 Herculis is a suspected astrometric binary star system located 92 light years from the Sun in the northern constellation Hercules. It is visible to the naked eye as a faint, white-hued point of light with an apparent visual magnitude of 4.34. The system is moving nearer to the Earth with a heliocentric radial velocity of −45 km/s, and may come as close as 11.26 pc ly 0 out off in 537,000 years. According to Garrison (1989), the visible component has a spectral classification if A3Va+, indicating an A-type main sequence star. Other authors have published classes of A5III, matching an A-type giant star, and A3IV, suggesting it is instead a subgiant star. Models of the star's evolution suggest that it is still on the main sequence. The interferometry-measured angular diameter of the primary component is 0.52 0.02 mas, which, at its estimated distance, equates to a physical radius of roughly 1.6 times the radius of the Sun. The star is estimated to be 559 million years old with 2.40 times the mass of the Sun and is spinning with a projected rotational velocity of 71 km/s. It is radiating 13 times the Sun's luminosity from its photosphere at an effective temperature of 8,873 K. References 111 Her 2019-06-18 4512265810537057664 Gray R. O. Garrison R. F. The Late A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation The Astrophysical Journal Supplement Series 1989 70 623 10.1086/191349 1989ApJS...70..623G XHIP: An extended hipparcos compilation Anderson E. Francis Ch. Astronomy Letters . 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 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 . 1 Cowley A. Cowley C. Jaschek M. Jaschek C. A study of the bright A stars. I. A catalogue of spectral classifications Astronomical Journal 74 375–406 April 1969 10.1086/110819 1969AJ.....74..375C 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 1501.03154 10.1088/0004-637X/804/2/146 33401607 Automated spectroscopic abundances of A and F-type stars using echelle spectrographs. II. Abundances of 140 A-F stars from ELODIE Erspamer D. North P. Astronomy and Astrophysics 398 1121–1135 February 2003 3 10.1051/0004-6361:20021711 astro-ph/0210065 2003A&A...398.1121E 1109164 . Richichi A. Percheron I. Khristoforova M. CHARM2: An updated Catalog of High Angular Resolution Measurements Astronomy and Astrophysics 431 773–777 February 2005 2 10.1051/0004-6361:20042039 2005A&A...431..773R free . Kenneth R. Lang Astrophysical formulae 1 Astronomy and astrophysics library 3rd Birkhäuser 2006 3-540-29692-1 https://books.google.com/books?id=OvTjLcQ4MCQC&pg=PA41 The radius (R*) is given by: Abt Helmut A. Morrell Nidia I. The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars Astrophysical Journal Supplement 99 135 1995 . 1995ApJS...99..135A 10.1086/192182 free Category:A-type giants Category:A-type subgiants Category:Astrometric binaries Category:Hercules (constellation) BD+18 3823 Herculis, 111 173880 092161 7069 Category:A3V stars