R Boötis

Not to be confused with Rho Boötis.
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
Mass1.492[8] M☉
Radius241 – 268[9] R☉
Luminosity4,255+1,009
−821[9] L☉
Surface gravity (log g)−0.33 or −0.25[9] cgs
Temperature3,029 – 3,061[9] K
Metallicity [Fe/H]+0.512[8] dex
Other designations
R Boo, BD+27°2400, GC 19706, HD 128609, HIP 71490, SAO 83440[10]
Database references
SIMBADdata

R Boötis is a variable star in the northern constellation of Boötes. The star's brightness varies tremendously, ranging from apparent magnitude 6.0, when it might be faintly visible to the naked eye under very good observing conditions, to 13.3, when a fairly large telescope would be required to see it.[3] 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.[11] 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.

R Boötis is much larger and luminous than the Sun, at {{val|4000|fmt=commas|u=solar luminosities and a size 250 times that of the Sun. It has cooled to an effective temperature of 3,000 Kelvins,[9] giving it a reddish hue.[12]

References

  1. ^ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. ^ a b c d e f 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. ^ a b c d 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. ^ a b 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. ^ 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. ^ a b VSX (4 January 2010). "R Boötis". AAVSO Website. American Association of Variable Star Observers. Retrieved 26 June 2014.
  7. ^ a b 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. ^ a b Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó.; Jordi, C.; Monguió, M.; Romero-Gómez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T. (2022-02-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics. 658: A91. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Database at VizieR. R Leporis = (Gaia DR3) 1279554668255201152.
  9. ^ a b c d e Béguin, E.; Chiavassa, A.; Ahmad, A.; Freytag, B.; Uttenthaler, S. (2024-10-01). "Retrieving stellar parameters and dynamics of AGB stars with Gaia parallax measurements and CO5BOLD RHD simulations". Astronomy & Astrophysics. 690: A125. arXiv:2409.03422. doi:10.1051/0004-6361/202450245. ISSN 0004-6361.
  10. ^ "R Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-05-01.
  11. ^ 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.
  12. ^ "The Colour of Stars", Australia Telescope, Outreach and Education, Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16