RS Telescopii

RS Telescopii

A visual band light curve for RS Telescopii, plotted from AAVSO data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Telescopium
Right ascension 18h 18m 51.2224s[2]
Declination −46° 32′ 53.427″[2]
Apparent magnitude (V) 10.67[3]
Characteristics
Spectral type R0
B−V color index 2.100±0.510[3]
Variable type R CrB[4]
Astrometry
Radial velocity (Rv)−3.0[3] km/s
Proper motion (μ) RA: −2.730[2] mas/yr
Dec.: −6.670[2] mas/yr
Parallax (π)0.1732 ± 0.0166 mas[2]
Distance19,000 ± 2,000 ly
(5,800 ± 600 pc)
Details
Radius73[5] R☉
Luminosity288 (at max)[6] L☉
Surface gravity (log g)1.0[7] cgs
Temperature5,800[6] K
Other designations
RS Tel, CD−46°12279, HIP 89739[8]
Database references
SIMBADdata

RS Telescopii, abbreviated RS Tel, is a variable star in the southern constellation of Telescopium. It is a dim star with an apparent visual magnitude of 10.67,[3] which is much too faint to be visible without a telescope. The variability of this star was discovered by Evelyn F. Leland and announced by Edward C. Pickering in 1910.[9] It was first studied by Cecilia H. Payne in 1928 at the Harvard College Observatory.[10][11]

This is an R-type carbon star with a class of R0.[12] RS Tel is a typical R Coronae Borealis variable[10]—an extremely hydrogen-deficient supergiant thought to have arisen as the result of the merger of two white dwarfs; fewer than 100 have been discovered as of 2012.[4] It has under 55%[13] the mass of the Sun and an effective temperature of around 5,800 K.[6] The spectrum of the star shows anomalously weak lines of hydrogen, with strong lines of C2, CN, and neutral carbon.[14]

RS Tel has a maximum magnitude of 9.6 and a minimum magnitude 16.5.[15] The star undergoes large, random variations in brightness on a time scale of thousands of days with no apparent periodicity.[16] The star is surrounded by a circumstellar shell of dust which radiating an infrared excess.[16]

  1. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference edr3 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference tisserand_et_al_2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference bergeat2002 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference hema2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Pickering1910 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Milone1990 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Payne1928 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Knapp_et_al_2001 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference stasinka_et_al_2006 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Bidelman1953 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference AAVSORS was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference Feast1997 was invoked but never defined (see the help page).