X Trianguli Australis

A visual band light curve for X Trianguli Australis, plotted from data published by Tabur et al. (2009)[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Triangulum Australe
Right ascension 15h 14m 19.17448s[2]
Declination −70° 04′ 46.1266″[2]
Apparent magnitude (V) +5.75[3]
Characteristics
Spectral type C5.5[4]
B−V color index 3.271±0.019[3]
Variable type Lb[5]
Astrometry
Radial velocity (Rv)−3.2±1.5[6] km/s
Proper motion (μ) RA: +4.276[2] mas/yr
Dec.: −7.566[2] mas/yr
Parallax (π)3.5388 ± 0.1944 mas[2]
Distance920 ± 50 ly
(280 ± 20 pc)
Absolute magnitude (MV)−1.97[3]
Details
Mass4.1[7] M☉
Radius257[7] R☉
Luminosity (bolometric)8,599[8] L☉
Temperature2,860±350[8] K
Other designations
X TrA, CPD−69°2267, HD 134453, HIP 74582, HR 5644, SAO 253062[9]
Database references
SIMBADdata

X Trianguli Australis is a star in the southern constellation Triangulum Australe. It is a red-hued carbon star approximately 920 light years (280 parsecs) from Earth, though this could vary by up to 200 light years.[10] It is a semi-regular variable star with two periods of around 385 and 455 days, and is of spectral type C5.5(Nb).[1] It ranges from magnitudes 5.03 to 6.05.[11] Its designation is from the variable star designation developed by German astronomer Friedrich Wilhelm Argelander.

It is a cool star, with estimates of its surface temperature ranging from 2,200 to 2,700 Kelvin.[10] A giant star, its diameter is 400 times that of the sun, and if placed at the center of the Solar System would stretch out to 30% further than Mars' orbit. Its absolute magnitude is −2.0.[10]

References

  1. 1 2 Tabur, V.; Bedding, T. R. (2009). "Long-term Photometry and Periods for 261 Nearby Pulsating M Giants". Monthly Notices of the Royal Astronomical Society. 400 (4): 1945–61. arXiv:0908.3228. Bibcode:2009MNRAS.400.1945T. doi:10.1111/j.1365-2966.2009.15588.x. S2CID 15358380.
  2. 1 2 3 4 5 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.
  3. 1 2 3 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.
  4. ↑ Warner, B. (1963). "Spectral classification of some Southern late-type peculiar stars". Monthly Notices of the Royal Astronomical Society. 126: 61. Bibcode:1963MNRAS.126...61W. doi:10.1093/mnras/126.1.61.
  5. ↑ Samus', N. N; Kazarovets, E. V; Durlevich, O. V; Kireeva, N. N; Pastukhova, E. N (2017). "General catalogue of variable stars: Version GCVS 5.1". Astronomy Reports. 61 (1): 80. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085. S2CID 125853869.
  6. ↑ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters, 32 (11): 759–771, arXiv:1606.08053, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065, S2CID 119231169.
  7. 1 2 Kervella, Pierre; Arenou, Frédéric; Thévenin, Frédéric (2022). "Stellar and substellar companions from Gaia EDR3". Astronomy & Astrophysics. 657: A7. arXiv:2109.10912. Bibcode:2022A&A...657A...7K. doi:10.1051/0004-6361/202142146. S2CID 237605138.
  8. 1 2 Rau, G.; et al. (April 2017). "The adventure of carbon stars. Observations and modeling of a set of C-rich AGB stars". Astronomy & Astrophysics. 600: 21. arXiv:1701.04331. Bibcode:2017A&A...600A..92R. doi:10.1051/0004-6361/201629337. S2CID 49571205. A92.
  9. ↑ "V* X TrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 January 2013.
  10. 1 2 3 Kaler, Jim (19 October 2012). "X Trianguli Australis". Stars. University of Illinois. Retrieved 18 January 2013.
  11. ↑ "X TrA". International Variable Star Index. American Association of Variable Star Observers. 11 November 2011. Retrieved 18 January 2013.
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