R Volantis

R Volantis is a single variable star in the southern circumpolar constellation Volans. It has an average apparent magnitude of 8.7,[9] making it readily visible in amateur telescopes but not to the naked eye. The object is relatively far at a distance of about 2,300 light years but is drifting closer with a radial velocity of −5 km/s.

R Volantis

A visual band light curve for R Volantis, plotted from AAVSO data[1]
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Volans
Right ascension 07h 05m 36.2081s[2]
Declination −73° 00′ 52.0345″[2]
Apparent magnitude (V) 8.78 - 11.50[3]
Characteristics
Evolutionary stage AGB[4]
Spectral type Ce[5]
Variable type Mira[6]
Astrometry
Radial velocity (Rv)−4.7[7] km/s
Proper motion (μ) RA: −14.298 mas/yr[2]
Dec.: +19.462 mas/yr[2]
Parallax (π)1.3931 ± 0.0631 mas[2]
Distance2,300 ± 100 ly
(720 ± 30 pc)
Details
Radius41.92+1.23
−3.03[8] R☉
Luminosity196±22[8] L☉
Temperature3,335+128
−48[8] K
Other designations
R Vol, CD−72°378, 2MASS J07053619-7300519
Database references
SIMBADdata

R Volantis' peculiarity was first observed in 1954 when it was found to have emission lines in its spectrum.[10] Observations from 1955 to 1967 reveal that the star was a probable Mira variable[11] and was given its current designation. However, its nature as a carbon star wasn't discovered until 1968 by Pik-Sin The. In the paper, R Volantis and V1163 Centauri (HD 114586) had their spectrums studied and revealed that the former is a carbon star while the latter is an S-type star.[12]

R Volantis has a stellar classification of Ce,[5] indicating that it is a carbon star with emission lines. It is a giant star on the asymptotic giant branch,[4] meaning that it is generating energy via hydrogen and helium shells around an inert carbon core. As a result, it has expanded to 41.92 times the radius of the Sun and now radiates a luminosity of 196 L☉.[8] R Vol has an effective temperature of 3,335 K, giving a deep red hue.[8]

It fluctuates between magnitude 8.7 and 15.4 and has a period of 445 days.[3]

References
  1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  3. Vogt, N.; Contreras-Quijada, A.; Fuentes-Morales, I.; Vogt-Geisse, S.; Arcos, C.; Abarca, C.; Agurto-Gangas, C.; Caviedes, M.; DaSilva, H.; Flores, J.; Gotta, V.; Peñaloza, F.; Rojas, K.; Villaseñor, J. I. (10 November 2016). "Determination of Pulsation Periods and Other Parameters of 2875 Stars Classified as MIRA in the All Sky Automated Survey (ASAS)". The Astrophysical Journal Supplement Series. 227 (1): 6. arXiv:1609.05246. Bibcode:2016ApJS..227....6V. doi:10.3847/0067-0049/227/1/6. eISSN 1538-4365.
  4. Montez, Rodolfo; Ramstedt, Sofia; Kastner, Joel H.; Vlemmings, Wouter; Sanchez, Enmanuel (22 May 2017). "A Catalog of GALEX Ultraviolet Emission from Asymptotic Giant Branch Stars". The Astrophysical Journal. 841 (1): 33. arXiv:1705.05371. Bibcode:2017ApJ...841...33M. doi:10.3847/1538-4357/aa704d. eISSN 1538-4357.
  5. Henize, K. G. (April 1976). "Observations of southern emission-line stars". The Astrophysical Journal Supplement Series. 30: 491. Bibcode:1976ApJS...30..491H. doi:10.1086/190369. eISSN 1538-4365. ISSN 0067-0049.
  6. Samus’, N. N.; Kazarovets, E. V.; Durlevich, O. V.; Kireeva, N. N.; Pastukhova, E. N. (January 2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. ISSN 1063-7729. S2CID 125853869.
  7. Menzies, John W.; Feast, Michael W.; Whitelock, Patricia A. (5 May 2006). "Carbon-rich Mira variables: radial velocities and distances". Monthly Notices of the Royal Astronomical Society. 369 (2): 783–790. arXiv:astro-ph/0603505. Bibcode:2006MNRAS.369..783M. doi:10.1111/j.1365-2966.2006.10323.x. ISSN 0035-8711.
  8. 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. Gaia DR2 record for this source at VizieR.
  9. Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  10. Bidelman, William P. (November 1954). "Catalogue and Bibliography of Emission-Line Stars of Types Later than B." The Astrophysical Journal Supplement Series. 1: 175. Bibcode:1954ApJS....1..175B. doi:10.1086/190007. eISSN 1538-4365. ISSN 0067-0049.
  11. Feuchter, A. Ch. (August 1967). "On several statistical characteristics of Mira variables". The Astronomical Journal. 72: 702. Bibcode:1967AJ.....72..702F. doi:10.1086/110295. ISSN 0004-6256.
  12. The, Pik-Sin (February 1968). "The Spectrum of the Variables R Vol and HD 114586". Publications of the Astronomical Society of the Pacific. 80 (472): 104. Bibcode:1968PASP...80..104T. doi:10.1086/128597. eISSN 1538-3873. ISSN 0004-6280.
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