Astronomy:R Horologii

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Short description: Variable star in the constellation Horologium
R Horologii
Location of R Horologii (circled in red)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Horologium
Right ascension  02h 53m 52.77010s[1]
Declination −49° 53′ 22.7305″[1]
Apparent magnitude (V) 4.7 – 14.3[2]
Characteristics
Spectral type M5-7e[3]
B−V color index 1.044±0.011[4]
Variable type Mira[5]
Astrometry
Radial velocity (Rv)+60.0±4.4[6] km/s
Proper motion (μ) RA: +128.567[1] mas/yr
Dec.: +35.766[1] mas/yr
Parallax (π)4.3236 ± 0.1524[1] mas
Distance756.0+31.6
−30.3 ly
(231.8+9.7
−9.3 pc)
Details
Mass0.89[7] M☉
Radius630[8][lower-alpha 1] R☉
Luminosity8,500[8] L☉
Surface gravity (log g)−0.44[7] cgs
Temperature2,200[9][8] K
Metallicity [Fe/H]+0.545[7] dex
Other designations
R Hor, CD−50°860, HD 18242, HIP 13502, HR 868[10]
Database references
SIMBADdata
The light curve of R Horologii from AAVSO V band data[11]

R Horologii is a red giant star approximately 760 light-years away in the southern constellation of Horologium.[12] It is a Mira variable with a period of 404.83 days,[13] ranging from apparent magnitude 4.7 to 14.3—one of the largest ranges in brightness known of stars in the night sky visible to the unaided eye.[2] The star is losing mass at the rate of 5.9×10−7 M☉·y−1.[9]

Notes

  1. ↑ Applying the Stefan–Boltzmann law with a nominal solar effective temperature of 5,772 K:
    (5,7722,200)4⋅8,500=630 R⊙.

References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York, New York: Springer Science & Business Media. p. 102. ISBN 9781461476481. https://books.google.com/books?id=uN69BAAAQBAJ&pg=PA102. 
  3. ↑ Keenan, Philip C. (June 1966). "A Catalogue of Spectra of Mira Variables of Types ME and Se". Astrophysical Journal Supplement 13: 333. doi:10.1086/190139. Bibcode: 1966ApJS...13..333K. 
  4. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  5. ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports 61 (1): 80. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  6. ↑ 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. 
  7. ↑ 7.0 7.1 7.2 Anders, F.; Khalatyan, A.; Chiappini, C.; Queiroz, A. B.; Santiago, B. X.; Jordi, C.; Girardi, L.; Brown, A. G. A. et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics 628: A94. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. Bibcode: 2019A&A...628A..94A. 
  8. ↑ 8.0 8.1 8.2 Danilovich, T.; Teyssier, D.; Justtanont, K.; Olofsson, H.; Cerrigone, L.; Bujarrabal, V.; Alcolea, J.; Cernicharo, J. et al. (2015-09-01). "New observations and models of circumstellar CO line emission of AGB stars in the Herschel SUCCESS programme" (in en). Astronomy & Astrophysics 581: A60. doi:10.1051/0004-6361/201526705. ISSN 0004-6361. Bibcode: 2015A&A...581A..60D. https://www.aanda.org/articles/aa/abs/2015/09/aa26705-15/aa26705-15.html. 
  9. ↑ 9.0 9.1 Danilovich, T. et al. (October 2017). "Sulphur-bearing molecules in AGB stars. I. The occurrence of hydrogen sulphide". Astronomy & Astrophysics 606: 14. doi:10.1051/0004-6361/201731203. A124. Bibcode: 2017A&A...606A.124D. 
  10. ↑ "R Horologii". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=R+Horologii. 
  11. ↑ "Download Data". AAVSO. https://www.aavso.org/data-download. 
  12. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–64. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. 
  13. ↑ Templeton, M. R.; Mattei, J. A.; Willson, L. A. (2005). "Secular Evolution in Mira Variable Pulsations". The Astronomical Journal 130 (2): 776–788. doi:10.1086/431740. Bibcode: 2005AJ....130..776T. 

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