Astronomy:T Coronae Australis
250px A visual band light curve for T Coronae Australis, adapted from Bellingham and Rossano (1980)[1] | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 19h 01m 58.790s[2] |
| Declination | −36° 57′ 50.33″[2] |
| Apparent magnitude (V) | 11.67[3] |
| Characteristics | |
| Spectral type | F0[4] |
| Variable type | Herbig Ae/Be star[4] |
| Astrometry | |
| Radial velocity (Rv) | 1.1[5] km/s |
| Proper motion (μ) | RA: 5.3±4.7[6] mas/yr Dec.: −24.9±4.7[6] mas/yr |
| Distance | 502.3 ly (154.0[5] pc) |
| Position (relative to A)[7] | |
| Component | B |
| Epoch of observation | 2023 – 2024 |
| Angular distance | 153.2±1.2 mas |
| Position angle | 275.4±0.1° |
| Observed separation (projected) | 23 AU {{{projsepref}}} |
| Details | |
| A | |
| Mass | 1.7[7] M☉ |
| Luminosity | 28.8[5] L☉ |
| B | |
| Mass | 0.9[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
T Coronae Australis (T CrA), is a binary star[7] in the constellation Corona Australis. It is a member of the Corona Australis star-forming region, which is located about 502 light-years (154.0 pc)[5] away. It is a Herbig Ae/Be star, still in the first stages of star formation,[4] and is surrounded by a circumstellar disk[4] seen edge-on.[5]
Johann Friedrich Julius Schmidt discovered that it is a variable star, in 1876. It appeared with its variable star designation in Annie Jump Cannon's 1907 work Second Catalogue of Variable Stars.[9]
As of 2024[update], the stars are separated by 153 mas along a position angle of 275°. Their observed physical separation is 23 astronomical units. The primary component is 1.7 times as massive as the Sun, while the secondary is 0.9 times as massive.[7]
References
- ↑ Bellingham, J. G.; Rossano, G. S. (May 1980). "Long-period variations in R CrA, S CrA, T CrA and R Mon". The Astronomical Journal 85 (5): 555–559. doi:10.1086/112711. Bibcode: 1980AJ.....85..555B. https://ui.adsabs.harvard.edu/abs/1980AJ.....85..555B. Retrieved 14 December 2021.
- ↑ 2.0 2.1 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237. Bibcode: 2002yCat.2237....0D.
- ↑ 4.0 4.1 4.2 4.3 Acke, B.; van den Ancker, M. E. (2004). "ISO spectroscopy of disks around Herbig Ae/Be stars". Astronomy and Astrophysics 426: 151–170. doi:10.1051/0004-6361:20040400. Bibcode: 2004A&A...426..151A.
- ↑ 5.0 5.1 5.2 5.3 5.4 Pascucci, Ilaria; Banzatti, Andrea; Gorti, Uma; Fang, Min; Pontoppidan, Klaus; Alexander, Richard; Ballabio, Giulia; Edwards, Suzan et al. (2020). "The Evolution of Disk Winds from a Combined Study of Optical and Infrared Forbidden Lines". The Astrophysical Journal 903 (2): 78. doi:10.3847/1538-4357/abba3c. Bibcode: 2020ApJ...903...78P.
- ↑ Zacharias, N.; Urban, S. E.; Zacharias, M. I.; Wycoff, G. L.; Hall, D. M.; Germain, M. E.; Holdenried, E. R.; Winter, L. (2003). "UCAC2 Catalogue (Zacharias+ 2004)". Vizier Online Data Catalog. Bibcode: 2003yCat.1289....0Z.
- ↑ 7.0 7.1 7.2 7.3 7.4 Varga, J.; Matter, A.; Millour, F.; Weigelt, G.; Van Boekel, R.; Lopez, B.; Lykou, F.; Kóspál, Á. et al. (2025). "T CrA has a companion". Astronomy & Astrophysics 695: L21. doi:10.1051/0004-6361/202453443. Bibcode: 2025A&A...695L..21V.
- ↑ "T CrA". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=T+CrA.
- ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory 55: 1–94. Bibcode: 1907AnHar..55....1C. https://articles.adsabs.harvard.edu/pdf/1907AnHar..55....1C. Retrieved 8 February 2025.
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