13 Boötis

Star in the constellation Boötes 250px A light curve for CF Boötis, plotted from Hipparcos data J2000 Boötes 14 08 17.30243 +49 27 29.3993 5.29 to 5.38 AGB M1.5III +1.637 0.010 +1.92 Lb −13.92 0.06 −58.584 59.801 4.6635 0.1756 −0.87 0.8-2.6 74 10 12 1114 48 commas 3889 379 248 commas CF Boo 13 Boo 5300 123782 +50°2047 3124 69068 44905 19095 14082+4927 14083+4927 HD+123782 13 Boötis is a solitary variable star in the northern constellation of Boötes, and is positioned near the western constellation border with Ursa Major. In 1977 it was given the variable star designation CF Boötis, often abbreviated CF Boo, while 13 Boötis is the star's Flamsteed designation. This star has a reddish hue and is faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 5.26. It is located at a distance of approximately 700 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −14 km/s. The variability of the brightness of 13 Boötis was announced by Joel Stebbins and Charles Morse Huffer in 1928, based on observations made at Washburn Observatory. This is an aging red giant star on the asymptotic giant branch with a stellar classification of M1.5III, which is interpreted by stellar evolutionary models to mean it has exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. It is classified as a slow irregular variable of the Lb type, and its brightness has been observed to vary from +5.29 down to +5.38. The star has ~74 times the girth of the Sun and is radiating 1,114 times the Sun's luminosity from its swollen photosphere at an effective temperature of 3,889 K. There is a magnitude 11.05 visual companion located at an angular separation of 76.40 arcseconds from the brighter star, along a position angle of 270°. This was first reported by William Herschel in 1783. Possible planetary system In 1991, Duquennoy & Mayor reported the possible presence of a low-mass object (of likely substellar nature) orbiting the red giant 13 Bootis. They set a minimum mass of 30 times that of Jupiter (likely a brown dwarf) and estimated an orbital period of 1.35 years. So far there has been no confirmation about the presence a substellar object. b ≥30 494 ≥1.25 0.21 References 30em * 13 Boo 25 May 2017 1511173389717021312 1 Mason B. D. Wycoff G. L. Hartkopf W. I. Douglass G. G. Worley C. E. The Washington Visual Double Star Catalog The Astronomical Journal 2014 122 6 3466–3471 2001AJ....122.3466M 10.1086/323920 free Stebbins Joel Huffer C. M. The Constancy of the Light of Red Stars Publications of the Washburn Observatory 1928 15 137–174 1928PWasO..15..137S https://articles.adsabs.harvard.edu/pdf/1928PWasO..15..137S 5 December 2024 Kukarkin B. V. Kholopov P. N. Fedorovich V. P. Kireyeva N. N. Kukarkina N. P. Medvedeva G. I. Perova N. B. 62nd Name-List of Variable Stars Information Bulletin on Variable Stars March 1977 1248 1–25 1977IBVS.1248....1K https://ibvs.konkoly.hu/pub/ibvs/1201/1248.pdf 5 December 2024 The HIPPARCOS and TYCHO catalogues EAS Astrometric and Photometric Star Catalogues Derived from the ESA Hipparcos Space Astrometry Mission Noordwijk, Netherlands ESA Publications Division 1997 ESA SP Series 1200 9290923997 1997HIP...C......0E https://cdsarc.cds.unistra.fr/viz-bin/ftp-index?/ftp/cats/more/HIP/cdroms/cats 15 October 2022 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 2008MNRAS.389..869E 0806.2878 10.1111/j.1365-2966.2008.13596.x free 14878976 Eggen Olin J. Asymptotic giant branch stars near the sun Astronomical Journal 104 1 July 1992 275–313 10.1086/116239 1992AJ....104..275E 1 Samus N. N. Kazarovets E. V. Durlevich O. V. Kireeva N. N. Pastukhova E. N. General Catalogue of Variable Stars 5.1 Astronomy Reports 2017 61 1 80–88 10.1134/S1063772917010085 125853869 2017ARep...61...80S Anderson E. Francis Ch. XHIP: An extended hipparcos compilation Astronomy Letters 38 5 331 2012 2012AstL...38..331A 1108.4971 10.1134/S1063773712050015 119257644 The Perkins catalog of revised MK types for the cooler stars Keenan Philip C. McNeil Raymond C. Astrophysical Journal Supplement Series 71 245 1989 1989ApJS...71..245K 10.1086/191373 Alvarez R. Mennessier M. -O. Determination of Miras temperatures from TiO and VO bands. Estimates of distances Astronomy and Astrophysics 317 761–768 1997 1997A&A...317..761A Duquennoy A. Mayor M. Multiplicity among solar-type stars in the solar neighbourhood. II - Distribution of the orbital elements in an unbiased sample Astronomy and Astrophysics 248 2 485–524 1991 1991A&A...248..485D Mermilliod, J.-C. Compilation of Eggen's UBV data, transformed to UBV (unpublished) Catalogue of Eggen's UBV Data http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1986EgUBV........0M&db_key=AST&nosetcookie=1 1986 1986EgUBV........0M External links HR 5300 CCDM J14082+4927 Image 13 Boötis Category:M-type giants Category:Slow irregular variables Category:Candidate planetary systems Category:Boötes Category:Durchmusterung objects Bootis, 13 123782 069068 5300 Bootis, CF Category:Asymptotic-giant-branch stars