RV Caeli

RV Caeli
Location of RV Caeli (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Caelum
Right ascension 04h 28m 09.46368s[1]
Declination −41° 51′ 35.4013″[1]
Apparent magnitude (V) 6.4±0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M1 III[4]
B−V color index +1.64[5]
Variable type semiregular[6]
Astrometry
Radial velocity (Rv)97.9±0.5[7] km/s
Proper motion (μ) RA: −14.75 mas/yr[8]
Dec.: +2.87 mas/yr[8]
Parallax (π)2.4402 ± 0.0229 mas[1]
Distance1,340 ± 10 ly
(410 ± 4 pc)
Absolute magnitude (MV)−1.36[9]
Details
Mass1.14[10] M☉
Radius107[11] R☉
Luminosity976±30[12] L☉
Surface gravity (log g)0.67[10] cgs
Temperature3,843±122[13] K
Metallicity [Fe/H]−0.15[10] dex
Other designations
4 G. Caeli[14], CD−42°1510, CPD−42°469, GC 5451, HD 28552, HIP 20856, HR 1429, SAO 216821[15]
Database references
SIMBADdata

RV Caeli, also known as HD 28552, is a solitary, red hued variable star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.4,[2] placing it near the limit for naked eye visibility. The object is located relatively far at a distance of 1,340 light years based on parallax measurements from Gaia DR3,[1] but is rapidly receding with a heliocentric radial velocity of 98 km/s.[7]

A visual band light curve for RV Caeli, adapted from Tabur et al. (2009).[16]

Hipparcos has found it to vary between its photometric values of 6.44 and 6.56,[6] which roughly corresponds with the magnitude as seen with the naked eye. It was first suspected of variability in 1970,[17] and a 1982 survey also identified suspected variations. However, it could not confirm it was a variable star.[18] It was confirmed as a variable star in 1999 on the basis of the Hipparcos photometry and given the variable star designation RV Caeli.[19]

RV Caeli is an evolved red giant star with a stellar classification of M1 III.[4] It is currently on the asymptotic giant branch,[3] generating energy via hydrogen and helium shell fusion around an inert carbon core. It has 114% the mass of the Sun[10] but has expanded to over 100 times its girth.[11] It radiates 976 times the luminosity of the Sun[12] from its photosphere at an effective temperature of 3,843 K.[13] RV Caeli is metal deficient, having an iron abundance 70% that of the Sun.

  1. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Eggen1992 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference AAVSO was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference VanLeeuwen2007 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  10. ^ a b c d Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Tabur was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Eggen1970 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Rufener1982 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Kazarovets1999 was invoked but never defined (see the help page).