RS Telescopii
Star in the constellation Telescopium / From Wikipedia, the free encyclopedia
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]
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] |
Distance | 19,000 ± 2,000 ly (5,800 ± 600 pc) |
Details | |
Radius | 73[5] R☉ |
Luminosity | 288 (at max)[6] L☉ |
Surface gravity (log g) | 1.0[7] cgs |
Temperature | 5,800[6] K |
Other designations | |
Database references | |
SIMBAD | data |
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]