1 Boötis

Binary star in the constellation Boötes J2000 Boötes A 13 40 40.46926 +19 57 20.5839 5.78 A 13 40 40.46926 +19 57 20.5839 9.60 A1 V + Am +0.02 +0.02 A −26 −46.723 +23.172 10.3308 0.0533 +0.79 B −44,301 +28.326 10.4702 0.0232 1 Boö A 2.54 0.09 2.5 56 9,863 3.90 60 323 1 Boö B 1.02 1.1 0.76 5,370 4.28 +20°2858 119055 66727 5144 82942 J13407+1958 J13407+1957 HD+119055 1+Boo+B B 1 Boötis (1 Boo) is a binary star system in the northern constellation of Boötes, located 318 light years away from the Sun. It is visible to the naked eye as a dim, white-hued star with a combined apparent visual magnitude of 5.71. The pair had an angular separation of 4.660 arcsecond as of 2008. It is moving closer to the Earth with a heliocentric radial velocity of −26 km/s. The magnitude 5.78 primary component is an A-type main-sequence star with a stellar classification of A1 V. This star has 2.5 times the mass of the Sun and is radiating 56 times the Sun's luminosity from its photosphere at an effective temperature of 9,863 K. It is 323 million years old and is spinning with a projected rotational velocity of 60 km/s. The system is a source for X-ray emission, which is most likely coming from the companion star. This magnitude 9.60 component is a possible pre-main sequence star with a mass similar to the Sun. It is radiating 76% of the Sun's luminosity at an effective temperature of 6,370 K. References 1249218214732128640 1249218146012950016 1 Boo 2019-04-01 1 Hubrig S. Le Mignant D. North P. Krautter J. Search for low-mass PMS companions around X-ray selected late B stars Astronomy and Astrophysics 372 152–164 June 2001 10.1051/0004-6361:20010452 2001A&A...372..152H astro-ph/0103201 17507782 cs2 Evans D. S. June 24, 1966 Batten Alan Henry Heard John Frederick The Revision of the General Catalogue of Radial Velocities Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30 (June 20–24) University of Toronto International Astronomical Union 1967IAUS...30...57E Royer F. Zorec J. Gómez A. E. Rotational velocities of A-type stars. III. Velocity distributions Astronomy and Astrophysics 463 2 671–682 10.1051/0004-6361:20065224 2007A&A...463..671R astro-ph/0610785 February 2007 18475298 Lutz T. E. Lutz J. H. Julie Lutz Spectral classification and UBV photometry of bright visual double stars Astronomical Journal 82 431–434 10.1086/112066 1977AJ.....82..431L June 1977 free 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 External links HR 5144 CCDM J13407+1958 Image 1 Boötis Category:A-type main-sequence stars Category:Double stars Category:Boötes Category:Durchmusterung objects Bootis, 01 119055 066727 5144