R Serpentis

R Serpentis is a Mira variable type star in the equatorial constellation of Serpens. It ranges between apparent magnitude 5.16 and 14.4, and spectral types M5e to M8e, over a period of 356.41 days.[4][10] The variability of this star was discovered in 1826 by Karl Ludwig Harding.[11]

R Serpentis
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension  15h 50m 41.73245s[1]
Declination +15° 08′ 01.0810″[1]
Apparent magnitude (V) 9.70[2]
Characteristics
Spectral type M5-8e[3]
B−V color index 1.500±0.510[2]
Variable type Mira[4]
Astrometry
Radial velocity (Rv)23.8±0.8[5] km/s
Proper motion (μ) RA: +2.387[1] mas/yr
Dec.: −36.699[1] mas/yr
Parallax (π)3.5110 ± 0.2966[1] mas
Distance930 ± 80 ly
(280 ± 20 pc)
Details
Radius~380[6] R☉
Luminosity1,704.70[7] L☉
Temperature2,780±80[8] K
Other designations
R Ser, BD+15° 2918, HD 141850, HIP 77615, HR 5894, SAO 101771[9]
Database references
SIMBADdata

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
  2. 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.
  3. 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.
  4. 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, Bibcode:2017ARep...61...80S, doi:10.1134/S1063772917010085.
  5. Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367: 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451.
  7. McDonald, I.; et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society, 427: 343, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x.
  8. Hofmann, K. -H.; et al. (January 2002), "Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models", New Astronomy, 7 (1): 9–20, arXiv:astro-ph/0004013, Bibcode:2002NewA....7....9H, doi:10.1016/S1384-1076(01)00085-9.
  9. "R Ser". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 September 2018.
  10. Watson, Christopher (4 January 2010). "R Serpentis". AAVSO Website. American Association of Variable Star Observers. Retrieved 22 May 2014.
  11. Zsoldos, E. (1994). "Three Early Variable Star Catalogues". Journal for the History of Astronomy. 25 (2): 92–98. Bibcode:1994JHA....25...92Z. doi:10.1177/002182869402500202.
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