RS_Telescopii
RS Telescopii
Star in the constellation Telescopium
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]