Astronomy:X Trianguli Australis

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Short description: Variable star in the constellation Triangulum Australe
X Trianguli Australis
250px
A visual band light curve for X Trianguli Australis, plotted from data published by Tabur et al. (2009)[1]
Observation data
Equinox J2000.0]] (ICRS)
Constellation Triangulum Australe
Right ascension  15h 14m 19.17550s[2]
Declination −70° 04′ 46.1133″[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: +3.932[2] mas/yr
Dec.: −8.402[2] mas/yr
Parallax (π)2.8588 ± 0.1525[2] mas
Distance1,140 ± 60 ly
(350 ± 20 pc)
Absolute magnitude (MV)−1.97[3]
Details[7]
Mass1.5 or 2 M☉
Radius535[lower-alpha 1] R☉
Luminosity (bolometric)12,815 L☉
Surface gravity (log g)−0.79 or −0.51 cgs
Temperature2,650 K
Other designations
X TrA, CPD−69°2267, HD 134453, HIP 74582, HR 5644, SAO 253062[8]
Database references
SIMBADdata

X Trianguli Australis is a star in the southern constellation Triangulum Australe. It is a red-hued carbon star approximately 1,140 light years (350 parsecs) from Earth.[2] 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 magnitude 5.03 to 6.05, making it faintly visible to the naked eye under excellent observing conditions.[9] The discovery by Louisa Dennison Wells that the star is a variable star, was announced in 1898.[10] Its designation is from the variable star designation developed by German astronomer Friedrich Wilhelm Argelander.

It is a cool star, with of a surface effective temperature of 2,650 K (2,380 °C), yet luminous, emitting 13,000 times the luminosity of the Sun. Its angular diameter was measured at 13.82×10−3 arcseconds, which at its distance give a diameter 540 times that of the Sun.[7][lower-alpha 1] If placed at the center of the Solar System, it would stretch out farther than Mars' orbit. Its absolute magnitude is −1.97.[3]

Notes

  1. ↑ 1.0 1.1 Calculated multiplying the angular diameter (in arcseconds) to the distance in parsecs: 0.01382Slovene pronunciation: [{{{1}}}]Thai pronunciation: [{{{1}}}]Neukirch, Jürgen; Schmidt, Alexander; Wingberg, Kay (2000), Cohomology of Number Fields, Grundlehren der Mathematischen Wissenschaften, 323, Berlin: Springer-Verlag, ISBN 978-3-540-66671-4 Template:ScribuntoPersian pronunciation: [{{{1}}}]{| class="wikitable" width="100%"

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References

  1. ↑ 1.0 1.1 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. doi:10.1111/j.1365-2966.2009.15588.x. Bibcode: 2009MNRAS.400.1945T. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  4. ↑ Warner, B. (1963). "Spectral classification of some Southern late-type peculiar stars". Monthly Notices of the Royal Astronomical Society 126: 61. doi:10.1093/mnras/126.1.61. Bibcode: 1963MNRAS.126...61W. 
  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. doi:10.1134/S1063772917010085. Bibcode: 2017ARep...61...80S. 
  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, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G. 
  7. ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201629337. A92. Bibcode: 2017A&A...600A..92R. 
  8. ↑ "V* X TrA". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=V%2A+X+TrA. 
  9. ↑ "X TrA". International Variable Star Index. American Association of Variable Star Observers. 11 November 2011. http://www.aavso.org/vsx/index.php?view=detail.top&oid=36671. 
  10. ↑ Pickering, E. C.; Bailey, S. I.; Fleming, W. P.; Leland, E. F.; Wells, L. D. (March 1898). "Variable star clusters. New variable stars". Astrophysical Journal 7: 208-211. doi:10.1086/140457. Bibcode: 1898ApJ.....7..208P. https://articles.adsabs.harvard.edu/pdf/1898ApJ.....7..208P. Retrieved 27 August 2025. 



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