R Volantis

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]
Distance2,317+97
−96 ly
(710.7+29.9
−29.5 pc)[8]
Details
Mass0.75[9] M☉
Radius687[10][a] R☉
Luminosity6,800[10] L☉
Temperature2,000[10] K
Other designations
R Vol, CD−72°378, 2MASS J07053619-7300519
Database references
SIMBADdata

R Volantis is a single variable star in the southern circumpolar constellation Volans. It has an average apparent magnitude of 8.7,[11] 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' peculiarity was first observed in 1954 when it was found to have emission lines in its spectrum.[12] Observations from 1955 to 1967 reveal that the star was a probable Mira variable[13] 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.[14]

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 687 times the radius of the Sun and now radiates a luminosity of 6800 L☉.[10] R Vol has an effective temperature of 2,000 K, giving a deep red hue.[10]

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

  1. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference EDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Vogt2016 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Montez2017 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Henize1976 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Menzies2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference b-j was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference rau was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference dust_agb was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Ducati was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Bidelman1954 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Feuchter1967 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference The1968 was invoked but never defined (see the help page).


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