TY Coronae Australis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | 19h 01m 40.83122s[2] |
| Declination | −36° 52′ 33.8018″[2] |
| Apparent magnitude (V) | 9.39[3] |
| Characteristics | |
| Spectral type | B9e[4] |
| Astrometry | |
| Proper motion (μ) | RA: −2.147±0.239[2] mas/yr Dec.: −32.723±0.226[2] mas/yr |
| Parallax (π) | 7.3290±0.1456 mas[2] |
| Distance | 445 ± 9 ly (136 ± 3 pc) |
| Other designations | |
| TY CrA, CD−37°13024, SAO 210829 | |
| Database references | |
| SIMBAD | data |
TY Coronae Australis (abbreviated as TY CrA), is a young star system around 3 million years old in the constellation Corona Australis. It is composed of a blue-white B-class star around triple the Sun's mass and a cooler smaller companion around half its mass (or 1.6 times that of the Sun). The system is an eclipsing binary with a period of 2.8 days.[5]
Robert T. A. Innes announced his discovery that the star is a variable star, in 1916.[6]
References
[edit]- ↑ Vaz, L. P. R.; Andersen, J.; Casey, B. W.; Clausen, J. V.; Mathieu, R. D.; Heyer, I. (June 1998). "Four-colour photometry of eclipsing binaries XXXIX. Light curves of the pre–main sequence triple system TY Coronae Australis?". Astronomy and Astrophysics Supplement Series. 130: 245–250. Bibcode:1998A&AS..130..245V. doi:10.1051/aas:1998224.
- 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. 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.
- ↑ Vieira, S. L. A.; Corradi, W. J. B.; Alencar, S. H. P.; Mendes, L. T. S.; Torres, C. A. O.; Quast, G. R.; Guimarães, M. M.; Da Silva, L. (2003). "Investigation of 131 Herbig Ae/Be Candidate Stars". The Astronomical Journal. 126 (6): 2971. Bibcode:2003AJ....126.2971V. doi:10.1086/379553.
- ↑ Casey, Brian W.; Mathieu, Robert D.; Vaz, Luiz Paulo R.; Andersen, Johannes; Suntzeff, Nicholas B. (1998). "The Pre-Main-Sequence Eclipsing Binary TY Coronae Australis: Precise Stellar Dimensions and Tests of Evolutionary Models". The Astronomical Journal. 115 (4): 1617–1633. Bibcode:1998AJ....115.1617C. doi:10.1086/300270.
- ↑ Innes, R. T. A. (November 1916). "The Variable Stars and Nebulae Near R Corona Australe". Circular of the Union Observatory Johannesburg. 36: 282–284. Bibcode:1916CiUO...36..282I.
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