Astronomy:R Boötis

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Short description: Star in the constellation Boötes
Not to be confused with Rho Boötis.
R Boötis
250px
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
Evolutionary stage AGB[4]
Spectral type M4-8e[5]
B−V color index 1.50±0.51[6]
Variable type Mira variable[3][7]
Astrometry
Radial velocity (Rv)−58.0±4.7[8] 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
Mass1.492[9] M☉
Radius241 – 268[10] R☉
Luminosity4,255+1,009
−821[10] L☉
Surface gravity (log g)−0.33 or −0.25[10] cgs
Temperature3,029 – 3,061[10] K
Metallicity [Fe/H]+0.512[9] 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. 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.[8]

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][7] The stellar classification of the star ranges from M4e to M8e,[5] where the 'e' indicates emission features in the spectrum.

R Boötis is much larger and luminous than the Sun, at 4,000 solar luminosities and a size 250 times that of the Sun. It has cooled to an effective temperature of 3,000 Kelvins,[10] giving it a reddish hue.[13]

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 3.3 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. ↑ Wu, Yuanwei; Zhang, Bo; Li, Jingjing; Zheng, Xing-Wu (2022). "Water-maser survey towards off-plane O-rich AGBs around the orbital plane of the Sagittarius stellar stream". Monthly Notices of the Royal Astronomical Society 516 (2): 1881. doi:10.1093/mnras/stac1971. Bibcode: 2022MNRAS.516.1881W. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  7. ↑ 7.0 7.1 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. 
  8. ↑ 8.0 8.1 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. 
  9. ↑ 9.0 9.1 Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó. et al. (2022-02-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics 658: A91. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Bibcode: 2022A&A...658A..91A.  Database at VizieR. R Boötis = (Gaia DR3) 1279554668255201152.
  10. ↑ 10.0 10.1 10.2 10.3 10.4 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" (in en). Astronomy & Astrophysics 690: A125. doi:10.1051/0004-6361/202450245. ISSN 0004-6361. https://www.aanda.org/articles/aa/full_html/2024/10/aa50245-24/aa50245-24.html. 
  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. 
  13. ↑ "The Colour of Stars", Australia Telescope, Outreach and Education (Commonwealth Scientific and Industrial Research Organisation), December 21, 2004, http://outreach.atnf.csiro.au/education/senior/astrophysics/photometry_colour.html, retrieved 2012-01-16 

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



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