R Boötis
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 14h37m11.57616s[2] |
| Declination | 26° 44′ 11.6562″[2] |
| Apparent magnitude(V) | 6.0 - 13.3[3] |
| Characteristics | |
| Spectral type | M4-8e[4] |
| B−Vcolor index | 1.50±0.51[5] |
| Variable type | Mira variable[3][6] |
| Astrometry | |
| Radial velocity(Rv) | −58.0±4.7[7]km/s |
| Proper motion(μ) | RA:–25.537[2]mas/yr Dec.:11.968[2]mas/yr |
| Parallax(π) | 1.5204 ± 0.0586mas[2] |
| Distance | 2,150 ± 80ly (660 ± 30pc) |
| Details | |
| Mass | 0.86[8]M☉ |
| Radius | 245[9]R☉ |
| Luminosity | 5,900[10]L☉ |
| Surface gravity(logg) | −0.44[8]cgs |
| Temperature | 2,640[8]K |
| Metallicity[Fe/H] | 0.55[8]dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
R Boötisis avariable starin the northernconstellationofBoötes.Typically the star is too faint to be readily visible to the naked eye, with a brightness that fluctuates betweenapparent visual magnitudesof 9.98.[5]The distance to this star is approximately2,150light yearsbased onparallaxmeasurements.[2]It is drifting closer with aradial velocityof about −58 km/s.[7]
The variability of this star was discovered by German astronomerF. W. Argelanderin 1857.[12]It is classified as aMira-typepulsating variablethat ranges in brightness from magnitude 6.0 down to 13.3 with a period of 223.11 days.[3][6]Thestellar classificationof the star ranges from M4e to M8e,[4]where the 'e' indicatesemission featuresin the spectrum.
Theangular diameterof R Boötis has been measured at3.45±0.1mas,[13]which at its estimated distance of 660parsecs[2]gives a physical size 245 times solar.[9]
References
[edit]- ^"Download Data".aavso.org.AAVSO.Retrieved1 October2021.
- ^abcdefgBrown, A. G. A.;et al. (Gaia collaboration) (2021)."GaiaEarly Data Release 3: Summary of the contents and survey properties ".Astronomy & Astrophysics.649:A1.arXiv:2012.01533.Bibcode:2021A&A...649A...1G.doi:10.1051/0004-6361/202039657.S2CID227254300.(Erratum:doi:10.1051/0004-6361/202039657e).Gaia EDR3 record for this sourceatVizieR.
- ^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.; et al. (1974)."Revised Catalog of Spectra of Mira Variables of Types ME and Se".Astrophysical Journal Supplement.28:271.Bibcode:1974ApJS...28..271K.doi:10.1086/190318.
- ^abAnderson, 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.
- ^abVSX (4 January 2010)."R Boötis".AAVSO Website.American Association of Variable Star Observers.Retrieved26 June2014.
- ^abGontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system".Astronomy Letters.32(11): 759–771.arXiv:1606.08053.Bibcode:2006AstL...32..759G.doi:10.1134/S1063773706110065.S2CID119231169.
- ^abcdAnders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A.; Matijevic, G.; Monari, G.; Cantat-Gaudin, T. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18".Astronomy and Astrophysics.628:A94.arXiv:1904.11302.Bibcode:2019A&A...628A..94A.doi:10.1051/0004-6361/201935765.ISSN0004-6361.S2CID131780028.
- ^abLang, Kenneth R. (2006),Astrophysical formulae,Astronomy and astrophysics library, vol. 1 (3 ed.),Birkhäuser,ISBN3-540-29692-1.The radius (R*) is given by:
- ^Gaia Collaboration; Brown, A. G. A.; Vallenari, A.; Prusti, T.; de Bruijne, J. H. J.; Babusiaux, C.; Bailer-Jones, C. A. L.; Biermann, M.; Evans, D. W.; Eyer, L.; Jansen, F. (2018-08-01)."Gaia Data Release 2. Summary of the contents and survey properties".Astronomy and Astrophysics.616:A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.ISSN0004-6361.
- ^"R Boo".SIMBAD.Centre de données astronomiques de Strasbourg.Retrieved2021-05-01.
- ^Isles, J. E.; Saw, D. R. B. (February 1987). "106 Mira Stars, - I. R Ari, R Aur, X Aur, R Boo and S Boo".Journal of the British Astronomical Association.97(2): 106–116.Bibcode:1987JBAA...97..106I.
- ^Richichi, A.; Percheron, I.; Khristoforova, M. (2005-02-01)."CHARM2: An updated Catalog of High Angular Resolution Measurements".Astronomy and Astrophysics.431:773–777.doi:10.1051/0004-6361:20042039.ISSN0004-6361.R Boötis' database entryatVizieR.
