Astronomy:W Coronae Borealis
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Short description: Star in the constellation Corona Borealis
| Observation data Equinox J2000.0]] (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[2] mas |
| 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 | |
| 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. https://www.aavso.org/data-download.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 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.
- ↑ 3.0 3.1 3.2 Samus, N. N. 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. doi:10.1051/0004-6361/202556118. Bibcode: 2025A&A...704A.186G.
- ↑ 5.0 5.1 5.2 Khalatyan, A.; Anders, F.; Chiappini, C.; Queiroz, A. B. A.; Nepal, S.; Dal Ponte, M.; Jordi, C.; Guiglion, G. et al. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics 691: A98. doi:10.1051/0004-6361/202451427. Bibcode: 2024A&A...691A..98K.
- ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ "W Coronae Borealis". SIMBAD Astronomical Database. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-id?Ident=W+CrB&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id. Retrieved 9 March 2015.
- ↑ VSX (4 January 2010). "W Coronae Borealis". AAVSO Website. American Association of Variable Star Observers. http://www.aavso.org/vsx/index.php?view=detail.top&oid=10605. Retrieved 9 March 2015.
External links
- W CrB lightcurve at AAVSO
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