Astronomy:S Coronae Australis
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Short description: Variable star in the constellation Corona Australis
250px A visual band light curve for S Coronae Australis, adapted from Mundt (1979).[1] The error bar shown on the left-most point applies to all points. | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Corona Australis |
| Right ascension | {{{ra}}} |
| Declination | −36° 57′ 19.8950″[2] |
| Apparent magnitude (V) | 10.49 - 13.20[3] |
| Characteristics | |
| Spectral type | G0Ve + K0Ve[4] |
| Variable type | T Tau[3] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | 0.0[5] km/s |
| Proper motion (μ) | RA: +7.054[6] mas/yr Dec.: −26.511[6] mas/yr |
| Parallax (π) | 6.2291 ± 0.0683[6] mas |
| Distance | 524 ± 6 ly (161 ± 2 pc) |
| B | |
| Radial velocity (Rv) | +6.0[7] km/s |
| Proper motion (μ) | RA: +2.477[8] mas/yr Dec.: −28.079[8] mas/yr |
| Parallax (π) | 6.7857 ± 0.0745[8] mas |
| Distance | 481 ± 5 ly (147 ± 2 pc) |
| Details | |
| A | |
| Mass | 0.8[9] M☉ |
| Radius | 2.3[9] R☉ |
| Luminosity | 1.7[9] L☉ |
| Surface gravity (log g) | 3.6[10] cgs |
| Temperature | 4,300[11] K |
| Rotation | 7.3[9] days |
| Rotational velocity (v sin i) | 10[10] km/s |
| B | |
| Mass | 0.6[11] M☉ |
| Luminosity | 0.76[11] L☉ |
| Temperature | 3,800[11] K |
| Other designations | |
S CrA, S Coronae Australis, HH 82 | |
| Database references | |
| SIMBAD | data |
S Coronae Australis (S CrA), is a young binary star system estimated to be around 2 million years old located in the constellation Corona Australis. It is composed of a G-type main sequence star that is about as luminous as and just over twice as massive as the Sun, and a smaller K-type main sequence star that has around 50-60% of the Sun's luminosity and 1.3 times its mass. Both stars are T Tauri stars and both show evidence of having circumstellar disks. The system is around 140 parsecs distant.[4]
Johann Friedrich Julius Schmidt discovered that the star is a variable star, in 1866. It appeared with its variable star designation in Annie Jump Cannon's 1907 work Second Catalogue of Variable Stars.[12]
References
- ↑ Mundt, R. (April 1979). "Spectroscopic and photometric variations of the YY Orionis star S CrA". Astronomy & Astrophysics 74: 21–29. Bibcode: 1979A&A....74...21M. https://ui.adsabs.harvard.edu/abs/1979A&A....74...21M. Retrieved 14 December 2021.
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedUCAC4 - ↑ 3.0 3.1 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.
- ↑ 4.0 4.1 Carmona, A.; van den Ancker, M. E.; Henning, Th. (2007). "Optical spectroscopy of close companions to nearby Herbig Ae/Be and T Tauri stars". Astronomy and Astrophysics 464 (2): 687–95. doi:10.1051/0004-6361:20065509. Bibcode: 2007A&A...464..687C.
- ↑ Malaroda, S.; Levato, H.; Morrell, N.; García, B.; Grosso, M.; Bolzicco, G. J. (2000). "Bibliographic catalogue of stellar radial velocities: (1991-1994)". Astronomy and Astrophysics Supplement Series 144: 1. doi:10.1051/aas:2000196. Bibcode: 2000A&AS..144....1M.
- ↑ 6.0 6.1 6.2 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.
- ↑ Malaroda, S.; Levato, H.; Morrell, N.; García, B.; Grosso, M.; Bolzicco, G. J. (2000). "Bibliographic catalogue of stellar radial velocities: (1991-1994)". Astronomy and Astrophysics Supplement Series 144: 1. doi:10.1051/aas:2000196. Bibcode: 2000A&AS..144....1M.
- ↑ 8.0 8.1 8.2 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.
- ↑ 9.0 9.1 9.2 9.3 GRAVITY Collaboration et al. (2024). "The GRAVITY young stellar object survey. XIV. Investigating the magnetospheric accretion-ejection processes in S CrA N". Astronomy and Astrophysics 690: A123. doi:10.1051/0004-6361/202451254. Bibcode: 2024A&A...690A.123G.
- ↑ 10.0 10.1 Nowacki, H.; Alecian, E.; Perraut, K.; Zaire, B.; Folsom, C. P.; Pouilly, K.; Bouvier, J.; Manick, R. et al. (2023). "Star-disk interactions in the strongly accreting T Tauri star S CrA N". Astronomy and Astrophysics 678: A86. doi:10.1051/0004-6361/202347145. Bibcode: 2023A&A...678A..86N.
- ↑ 11.0 11.1 11.2 11.3 Salyk, Colette; Herczeg, Gregory J.; Brown, Joanna M.; Blake, Geoffrey A.; Pontoppidan, Klaus M.; Van Dishoeck, Ewine F. (2013). "Measuring Protoplanetary Disk Accretion with H I Pfund β". The Astrophysical Journal 769 (1): 21. doi:10.1088/0004-637X/769/1/21. Bibcode: 2013ApJ...769...21S.
- ↑ 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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