RS Telescopii

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,[2] 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.[5] It was first studied by Cecilia H. Payne in 1928 at the Harvard College Observatory.[6][7]

RS Telescopii
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Telescopium
Right ascension 18h 18m 51.22234s[1]
Declination −46° 32′ 53.4272″[1]
Apparent magnitude (V) 10.67[2]
Characteristics
Spectral type R0
B−V color index 2.100±0.510[2]
Variable type R CrB[3]
Astrometry
Radial velocity (Rv)−3.0[2] km/s
Proper motion (μ) RA: −2.716[1] mas/yr
Dec.: −6.671[1] mas/yr
Parallax (π)0.0937 ± 0.0423[1] mas
Distanceapprox. 30,000 ly
(approx. 11,000 pc)
Details
Temperature5,111+277
−118[1] K
Other designations
RS Tel, CD−46°12279, HIP 89739[4]
Database references
SIMBADdata

This is an R-type carbon star with a class of R0.[8] RS Tel is a typical R Coronae Borealis variable[6]—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.[3] It has under 55%[9] the mass of the Sun and an effective temperature of around 5,111 K.[1] The spectrum of the star shows anomalously weak lines of hydrogen, with strong lines of C2, CN, and neutral carbon.[10]

RS Tel has a maximum magnitude of 9.6 and a minimum magnitude 16.5.[11] The star undergoes large, random variations in brightness on a time scale of thousands of days with no apparent periodicity.[12] As of 2012, four dimmings have been observed.[3] The star is surrounded by a circumstellar shell of dust which radiating an infrared excess.[12]

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. Tisserand, P.; et al. (2012). "The Ongoing Pursuit of R Coronae Borealis Stars: ASAS-3 Survey Strikes Again". Astronomy & Astrophysics. 551: 22. arXiv:1211.2475. Bibcode:2013A&A...551A..77T. doi:10.1051/0004-6361/201220713. S2CID 59060842. A77.
  4. "RS Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-12-11.
  5. Pickering, Edward C. (March 1910). "20 new variable stars in Harvard Map, Nos. 2, 5, 32, 44 and 53". Astronomische Nachrichten. 184: 5. Bibcode:1910AN....184....5P. doi:10.1002/asna.19101840104.
  6. Milone, Luis A. (October 1990). "Identification charts for southern R Coronae Borealis-stars". Astrophysics and Space Science. 172 (2): 263–271. Bibcode:1990Ap&SS.172..263M. doi:10.1007/BF00643318.
  7. Payne, Cecilia H. (October 1928). "The R Coronae Type Variables RS Telescopii and Y Muscae". Harvard College Observatory Bulletin. 861: 11–12. Bibcode:1928BHarO.861...11P.
  8. Knapp, G.; et al. (May 2001). "Reprocessing the Hipparcos data for evolved giant stars II. Absolute magnitudes for the R-type carbon stars". Astronomy and Astrophysics. 371: 222–232. arXiv:astro-ph/0103141. Bibcode:2001A&A...371..222K. doi:10.1051/0004-6361:20010348.
  9. Stasińska, G.; Szczerba, R.; Schmidt, M.; Siódmiak, N. (2006). "Post-AGB stars as testbeds of nucleosynthesis in AGB stars". Astronomy and Astrophysics. 450 (2): 701. arXiv:astro-ph/0601504. Bibcode:2006A&A...450..701S. doi:10.1051/0004-6361:20053553. S2CID 12040452.
  10. Bidelman, William P. (January 1953). "The Spectra of Certain Stars whose Atmospheres may be Deficient in Hydrogen". Astrophysical Journal. 117: 25. Bibcode:1953ApJ...117...25B. doi:10.1086/145665.
  11. BSJ (11 November 2011). "RX Telescopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 26 June 2014.
  12. Feast, M. W.; et al. (February 1997). "The R Coronae Borealis stars - I. Infrared photometry and long-term variations". Monthly Notices of the Royal Astronomical Society. 285 (2): 317–338. Bibcode:1997MNRAS.285..317F. doi:10.1093/mnras/285.2.317.
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