W Coronae Borealis
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 16h 15m 24.549s[2] |
| Declination | +37° 47′ 44.21″[2] |
| Apparent magnitude (V) | 7.8 - 14.3[3] |
| Characteristics | |
| Evolutionary stage | AGB[4] |
| Spectral type | M2e-M5e[3] |
| Variable type | mira[3] |
| Astrometry | |
| Proper motion (μ) | RA: −9.527[2] mas/yr Dec.: −6.275[2] mas/yr |
| Parallax (π) | 0.4201±0.0447 mas[2] |
| Distance | approx. 7,800 ly (approx. 2,400 pc) |
| Details | |
| Mass | 3.9[5] M☉ |
| Radius | 404[2] R☉ |
| Luminosity | 6,088[6] L☉ |
| Surface gravity (log g) | 1.38[5] cgs |
| Temperature | 3,981[5] K |
| Other designations | |
| HD 146560[7] | |
| Database references | |
| SIMBAD | data |
W Coronae Borealis (W CrB) is a Mira-type long period variable star in the constellation Corona Borealis located about 7,800 light-years away. Its apparent magnitude varies between 7.8 and 14.3 over 238 days (8 months),[8] representing about a 400–fold change in brightness. W Coronae Borealis enters solar conjunction and becomes hidden by the Sun's glare in late November. It reaches opposition in late April, when it is visible all night.
References
- ↑ "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- 1 2 3 4 5 6 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.
- 1 2 3 Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/GCVS. Bibcode:2009yCat....102025S.
- ↑ Gérard, E.; Van Driel, W.; Matthews, L. D.; Le Bertre, T.; Martin, J.-M.; Riêu, N. Q. (2025). "H I line observations of 151 evolved stars made with the Nançay Radio Telescope: II. Analysis of the H I and H2 content of AGB star circumstellar envelopes". Astronomy and Astrophysics. 704. Bibcode:2025A&A...704A.186G. doi:10.1051/0004-6361/202556118.
- 1 2 3 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G.; Valentini, M.; Torralba Elipe, G.; Steinmetz, M.; Pantaleoni-González, M.; Malhotra, S.; Jiménez-Arranz, Ó.; Enke, H.; Casamiquela, L.; Ardèvol, J. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics. 691: A98. arXiv:2407.06963. Bibcode:2024A&A...691A..98K. doi:10.1051/0004-6361/202451427.
- ↑ 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.
- ↑ "W Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. Retrieved 9 March 2015.
- ↑ VSX (4 January 2010). "W Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. Retrieved 9 March 2015.
External links
- W CrB lightcurve at AAVSO
