Astronomy:R Boötis

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R Boötis
RBooLightCurve.png
The visual band light curve of R Boötis, from AAVSO data[1]
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
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. https://www.aavso.org/data-download. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 Samus, N. N. et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1 61 (1): 80–88. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  4. ↑ 4.0 4.1 Keenan, Philip C. et al. (1974). "Revised Catalog of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement 28: 271. doi:10.1086/190318. Bibcode: 1974ApJS...28..271K. 
  5. ↑ 5.0 5.1 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  6. ↑ 6.0 6.1 VSX (4 January 2010). "R Boötis". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=4304. 
  7. ↑ 7.0 7.1 Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  8. ↑ 8.0 8.1 8.2 8.3 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (2019-08-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  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. doi:10.1051/0004-6361/201834371. A72. Bibcode: 2019A&A...623A..72K. 
  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. et al. (2018-08-01). "Gaia Data Release 2. Summary of the contents and survey properties". Astronomy and Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. ISSN 0004-6361. Bibcode: 2018A&A...616A...1G. 
  11. ↑ "R Boo". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=R+Boo. 
  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. 

Coordinates: Sky map 14h 37m 11.5787s, +26° 44′ 11.663″



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