TY Coronae Borealis, also known as Ross 808, is a variable white dwarf star of the DAV (or ZZ Ceti) type in the constellation Corona Borealis. It has a surface temperature of 11,213 ± 130 K and a mass around 70% times that of the Sun, but only 1.1% of its diameter.[5] It is 107 light-years distant from Earth.[2] It was confirmed as a variable star in 1976.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h 01m 23.187s[2] |
| Declination | +36° 48′ 34.29″[2] |
| Apparent magnitude (V) | 14.53[3] |
| Characteristics | |
| Evolutionary stage | White dwarf |
| Spectral type | DA4.4[4] |
| Astrometry | |
| Proper motion (μ) | RA: 101.113[2] mas/yr Dec.: −545.353[2] mas/yr |
| Parallax (π) | 30.4668 ± 0.0187 mas[2] |
| Distance | 107.05 ± 0.07 ly (32.82 ± 0.02 pc) |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
edit- ^ Bognár, Zs.; Paparó, M.; Sódor, Á.; Jenei, D. I.; Kalup, Cs.; Bertone, E.; Chavez-Dagostino, M.; Montgomery, M. H.; Gyõrffy, Á.; Molnár, L.; Ollé, H.; Pápics, P. I.; Plachy, E.; Verebélyi, E. (January 2019). "Wandering near the red edge: photometric observations of three cool ZZ Ceti stars". Monthly Notices of the Royal Astronomical Society. 482 (3): 4018–4031. arXiv:1810.09711. Bibcode:2019MNRAS.482.4018B. doi:10.1093/mnras/sty2884.
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ Watson, Christopher (4 January 2010). "TY Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 23 November 2014.
- ^ a b "TY CrB". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 5 December 2016.
- ^ Romero, A. D.; Córsico, A. H.; Althaus, L. G.; Kepler, S. O.; Castanheira, B. G.; Miller Bertolami, M. M. (2012). "Toward ensemble asteroseismology of ZZ Ceti stars with fully evolutionary models". Monthly Notices of the Royal Astronomical Society. 420 (2): 1462–80. arXiv:1109.6682. Bibcode:2012MNRAS.420.1462R. doi:10.1111/j.1365-2966.2011.20134.x. S2CID 55018129.
- ^ McGraw, John T.; Robinson, Edward L. (1976). "High-speed photometry of luminosity-variable DA dwarfs: R808, GD 99, and G 117-B15A". Astrophysical Journal Letters. 205: L155-58. Bibcode:1976ApJ...205L.155M. doi:10.1086/182112.
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