TY Coronae Australis

TY Coronae Australis

The y band (near infrared) light curve for TY Coronae Australis, adapted from Vaz et al. (1998) [1]
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
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, SAO  210829, CD −37° 13024
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. ^[4]

Robert T. A. Innes announced his discovery that the star is a variable star, in 1916. ^[5]

References

1. 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 .
2. 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.
3. 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. 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 .
5. 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 . Retrieved 8 February 2025.