Astronomy:R Aurigae

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R Aurigae
RAurLightCurve.png
The visual band light curve of R Aurigae, from AAVSO data[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Auriga
Right ascension  05h 17m 17.6916s[2]
Declination +53° 35′ 10.032″[2]
Apparent magnitude (V) 6.7 to 13.9[3]
Characteristics
Spectral type M7IIIe[4] (M6e - M9e)[3]
U−B color index +0.27[5]
B−V color index +1.66[5]
Variable type Mira[3]
Astrometry
Radial velocity (Rv)7.8 ± 2[6] km/s
Proper motion (μ) RA: 14.708[2] mas/yr
Dec.: −14.685[2] mas/yr
Parallax (π)3.4958 ± 0.1327[2] mas
Distance930 ± 40 ly
(290 ± 10 pc)
Details
Radius300[7] R
Luminosity11,530[8] L
Temperature2,385[8] K
Other designations
R Aur, ADS 3845 A, BD+53 882, CCDM J05173+5335A, GC 6435, HD 34019, HIP 24645, HR 1707, IDS 05092+5328 A, SAO 25112[6]
Database references
SIMBADdata

R Aurigae (R Aur) is a Mira variable, a pulsating red giant star in the constellation of Auriga, at a distance of 930 light years.

R Aurigae has an apparent visual magnitude which varies between 6.7 and 13.9 with a period of 450 days.[3] The light curve varies strongly from cycle to cycle, sometimes having a pronounced hump on the ascending branch and usually having rise and fall times approximately equal. The cycle period has oscillated slowly between about 450 and 465 days. The discoverer of R Aurigae's variability is not known, but it was widely observed in the late 19th century and its spectrum was described in 1890.[9]

R Aurigae is catalogued as a component of a double star, with the 10th magnitude HD 233095, although the two stars are unrelated.[10]

References

  1. "Download Data". AAVSO. https://www.aavso.org/data-download. 
  2. Jump up to: 2.0 2.1 2.2 2.3 2.4 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. Bibcode2021A&A...649A...1G.  Gaia EDR3 record for this source at VizieR.
  3. Jump up to: 3.0 3.1 3.2 3.3 R Aur, database entry, The combined table of GCVS Vols I-III and NL 67-78 with improved coordinates, General Catalogue of Variable Stars , Sternberg Astronomical Institute, Moscow, Russia. Accessed on line November 10, 2009.
  4. Skiff, B. A. (1994). "Photometry of Stars in the Field of R Aurigae". Information Bulletin on Variable Stars 4058: 1. Bibcode1994IBVS.4058....1S. 
  5. Jump up to: 5.0 5.1 HR 1707, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 10, 2009.
  6. Jump up to: 6.0 6.1 "V* R Aur". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+R+Aur. 
  7. HD 34019, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line November 10, 2009.
  8. Jump up to: 8.0 8.1 McDonald, I. et al. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode2012MNRAS.427..343M. 
  9. "LPV of the Month December, 2016". https://www.aavso.org/lpv-month-december-2016. 
  10. Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal 122 (6): 3466. doi:10.1086/323920. Bibcode2001AJ....122.3466M.