S Coronae Australis

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S Coronae Australis
SCrALightCurve.png
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
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Corona Australis
Right ascension 19h 01m 08.59709s [2]
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  mas [6]
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  mas [8]
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☉
Luminosity0.76 [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

  1. ↑ 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 . Retrieved 14 December 2021.
  2. 1 2 Zacharias, N.; Finch, C. T.; Girard, T. M.; Henden, A.; Bartlett, J. L.; Monet, D. G.; Zacharias, M. I. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.
  3. 1 2 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.
  4. 1 2 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. arXiv: astro-ph/0701208 . Bibcode:2007A&A...464..687C. doi:10.1051/0004-6361:20065509. S2CID   14372262.
  5. ↑ 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. Bibcode:2000A&AS..144....1M. doi:10.1051/aas:2000196.
  6. 1 2 3 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.
  7. ↑ 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. Bibcode:2000A&AS..144....1M. doi:10.1051/aas:2000196.
  8. 1 2 3 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.
  9. 1 2 3 4 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. arXiv: 2408.02374 . Bibcode:2024A&A...690A.123G. doi:10.1051/0004-6361/202451254.
  10. 1 2 Nowacki, H.; Alecian, E.; Perraut, K.; Zaire, B.; Folsom, C. P.; Pouilly, K.; Bouvier, J.; Manick, R.; Pantolmos, G.; Sousa, A. P.; Dougados, C.; Hussain, G. A. J.; Alencar, S. H. P.; Le Bouquin, J. B. (2023). "Star-disk interactions in the strongly accreting T Tauri star S CrA N". Astronomy and Astrophysics. 678: A86. arXiv: 2308.03442 . Bibcode:2023A&A...678A..86N. doi:10.1051/0004-6361/202347145.
  11. 1 2 3 4 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. arXiv: 1303.4804 . Bibcode:2013ApJ...769...21S. doi:10.1088/0004-637X/769/1/21.
  12. ↑ Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C . Retrieved 8 February 2025.
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