13 Boötis
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h08m17.30243s[1] |
| Declination | +49° 27′ 29.3993″[1] |
| Apparent magnitude(V) | 5.26[2](5.29 to 5.38)[3] |
| Characteristics | |
| Spectral type | M1.5III[4] |
| U−Bcolor index | +1.92[5] |
| B−Vcolor index | +1.637±0.010[2] |
| Variable type | Lb[3] |
| Astrometry | |
| Radial velocity(Rv) | −13.92±0.06[2]km/s |
| Proper motion(μ) | RA:−58.584[1]mas/yr Dec.:59.801[1]mas/yr |
| Parallax(π) | 4.6635 ± 0.1756mas[1] |
| Distance | 700 ± 30ly (214 ± 8pc) |
| Absolute magnitude(MV) | −0.87[2] |
| Details | |
| Mass | 0.8-2.6[6]M☉ |
| Radius | 74+10 −12[1]R☉ |
| Luminosity | 1,114±48[1]L☉ |
| Temperature | 3,889+379 −248[1]K |
| Other designations | |
| Database references | |
| SIMBAD | data |
13 Boötisis a solitary[8]variable starin the northernconstellationofBoötes,and is positioned near the western constellation border withUrsa Major.It has thevariable star designationCF Boötis,often abbreviated CF Boo, while13 Boötisis the star'sFlamsteed designation.This star has a reddish hue and is faintly visible to the naked eye with anapparent visual magnitudethat fluctuates around 5.26.[2]It is located at a distance of approximately 700light yearsfrom theSunbased onparallax,but is drifting closer with aradial velocityof −14 km/s.[2]
This is an agingred giantstar on theasymptotic giant branch[9]with astellar classificationof M1.5III,[4]which is interpreted bystellar evolutionarymodels to mean it has exhausted the supply of hydrogen at itscorethen cooled and expanded off themain sequence.It is classified as aslow irregular variableof the Lb type, and its brightness has been observed to vary from +5.29 down to +5.38.[3]The star has ~74 times the girth of the Sun and is radiating 1,114 times the Sun's luminosity from its swollenphotosphereat aneffective temperatureof 3,889 K.[1]
There is a magnitude 11.05visual companionlocated at anangular separationof76.40arcsecondsfrom the brighter star, along aposition angleof 270°. This was first reported byWilliam Herschelin 1783.[10]
Possible planetary system
[edit]In 1991, Duquennoy & Mayor[11]reported the possible presence of a low-mass object (of likelysubstellarnature) orbiting the red giant 13 Bootis. They set a minimum mass of 30 times that ofJupiter(likely abrown dwarf) and estimated an orbital period of 1.35 years. So far there has been no confirmation about the presence a substellar object.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b(unconfirmed) | ≥30MJ | ≥1.25 | 494 | 0.21 | — | — |
References
[edit]- ^abcdefghiBrown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcdefAnderson, 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.S2CID119257644.
- ^abcSamus, 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.S2CID125853869.
- ^abKeenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars".Astrophysical Journal Supplement Series.71:245.Bibcode:1989ApJS...71..245K.doi:10.1086/191373.
- ^Mermilliod, J.-C. (1986)."Compilation of Eggen's UBV data, transformed to UBV (unpublished)".Catalogue of Eggen's UBV Data.Bibcode:1986EgUBV........0M.
- ^Alvarez, R.; Mennessier, M. -O. (1997). "Determination of Miras temperatures from TiO and VO bands. Estimates of distances".Astronomy and Astrophysics.317:761–768.Bibcode:1997A&A...317..761A.
- ^"* 13 Boo".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved25 May2017.
- ^Eggleton, 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.S2CID14878976.
- ^Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun".Astronomical Journal.104(1): 275–313.Bibcode:1992AJ....104..275E.doi:10.1086/116239.
- ^Mason, B. D.; et al. (2014)."The Washington Visual Double Star Catalog".The Astronomical Journal.122(6): 3466–3471.Bibcode:2001AJ....122.3466M.doi:10.1086/323920.
- ^Duquennoy, A.; Mayor, M. (1991). "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.Bibcode:1991A&A...248..485D.
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