R Boötis

The visual band light curve of R Boötis, from AAVSO data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 37m 11.57616s[2]
Declination 26° 44′ 11.6562″[2]
Apparent magnitude (V) 6.0 - 13.3[3]
Characteristics
Spectral type M4-8e[4]
B−V color 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 ± 0.0586 mas[2]
Distance2,150 ± 80 ly
(660 ± 30 pc)
Details
Mass0.86[8] M☉
Radius475[9] R☉
Luminosity5,900[10] L☉
Surface gravity (log g)−0.44[8] cgs
Temperature2,640[8] K
Metallicity [Fe/H]0.55[8] dex
Other designations
R Boo, BD+27°2400, GC 19706, HD 128609, HIP 71490, SAO 83440[11]
Database references
SIMBADdata

R Boötis is a variable star in the northern constellation of Boötes. Typically the star is too faint to be readily visible to the naked eye, with a brightness that fluctuates between apparent visual magnitudes of 9.98.[5] The distance to this star is approximately 2,150 light years based on parallax measurements.[2] It is drifting closer with a radial velocity of about −58 km/s.[7]

The variability of this star was discovered by German astronomer F. W. Argelander in 1857.[12] It is classified as a Mira-type pulsating variable that ranges in brightness from magnitude 6.0 down to 13.3 with a period of 223.11 days.[3][6] The stellar classification of the star ranges from M4e to M8e,[4] where the 'e' indicates emission features in the spectrum.

References

  1. ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 1 2 3 4 5 6 Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early 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. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. 1 2 3 Samus, 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. S2CID 125853869.
  4. 1 2 Keenan, 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.
  5. 1 2 Anderson, 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. S2CID 119257644.
  6. 1 2 VSX (4 January 2010). "R Boötis". AAVSO Website. American Association of Variable Star Observers. Retrieved 26 June 2014.
  7. 1 2 Gontcharov, 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. S2CID 119231169.
  8. 1 2 3 4 Anders, 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. ISSN 0004-6361. S2CID 131780028.
  9. ↑ Kervella, Pierre; et al. (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly". Astronomy & Astrophysics. 623: 23. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. S2CID 119491061. A72.
  10. ↑ 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. ISSN 0004-6361.
  11. ↑ "R Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-05-01.
  12. ↑ 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.
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