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 19.17550s[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 mas/yr[2] Dec.: −8.402 mas/yr[2] |
| Parallax (π) | 2.8588±0.1525 mas[2] |
| Distance | 1,140 ± 60 ly (350 ± 20 pc) |
| Absolute magnitude (MV) | −1.97[3] |
| Details[7] | |
| Mass | 1.5 or 2 M☉ |
| Radius | 535[a] R☉ |
| Luminosity (bolometric) | 12,815 L☉ |
| Surface gravity (log g) | −0.79 or −0.51 cgs |
| Temperature | 2,650 K |
| Other designations | |
| X TrA, AAVSO 1504-69, CPD−69°2267, HD 134453, HIP 74582, HR 5644, SAO 253062[8] | |
| Database references | |
| SIMBAD | data |
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 magnitudes 5.03 to 6.05.[9] 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][a] 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
References
- 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.
- 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- 1 2 3 4 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.
- ↑ 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.
- ↑ 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.
- ↑ 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.
- 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.
- ↑ "V* X TrA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 18 January 2013.
- ↑ "X TrA". International Variable Star Index. American Association of Variable Star Observers. 11 November 2011. Retrieved 18 January 2013.
