 The visual band light curve of UX Antliae, from AAVSO data | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Corona Borealis |
| Right ascension | 10 57 9.051 |
| Declination | −37° 23′ 55.06″ |
| Apparent magnitude (V) | 11.85 - 18.0 |
| Characteristics | |
| Spectral type | C(F) |
| Variable type | R CrB |
| Astrometry | |
| Radial velocity (Rv) | 27.83 km/s |
| Proper motion (μ) | RA: -3.8 mas/yr Dec.: 2.3 mas/yr |
| Distance | ~25,000 pc |
| Absolute magnitude (MV) | ~−5 |
| Details | |
| Mass | 0.722 M☉ |
| Surface gravity (log g) | 0.5 cgs |
| Temperature | 7,000 K |
| Other designations | |
| 2MASS J10570905-3723550, TYC 7212-77-1, HV 10108, DENIS-P J105709.0-372354, GSC 07212-00077, GSC2 S1303203939, AAVSO 1052-36 | |
| Database references | |
| SIMBAD | data |
UX Antliae is a post-AGB and R Coronae Borealis variable star that has a base apparent magnitude of around 11.85, with irregular dimmings down to below magnitude 18.0.
Researchers David Kilkenny and J.E. Westerhuys of the South African Astronomical Observatory confirmed that UX Antliae was an R Coronae Borealis variable in 1990 after noting the similarity of its spectrum to the RCB star W Mensae. It had been suspected of being one since 1940, but had been little-studied and exhibited no characteristic declines between 1975 and 1990.
Assuming that its absolute magnitude is around -5, it has been estimated as lying 25000 parsecs distant from Earth. Kilkenny and Westerhuys noted that its spectrum fit with that of a star of spectral class F, although was deficient in hydrogen. It has around 70% the mass of the Sun and an effective (surface) temperature of around 7000 K.
See also
References
- "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
- ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862.
- Otero, Sebastian (23 November 2012). "UX Antliae". The International Variable Star Index. Retrieved 14 July 2014.
- ^ Lawson, W. A.; Cottrell, P. L.; Kilkenny, D.; Gilmore, A. C.; Kilmartin, P. M.; Marang; Roberts; Van Wyk (1994). "The Variability of the R-Coronae Star Ux-Antliae at Maximum Light". Mon. Not. R. Astron. Soc. 271 (4): 919–23. Bibcode:1994MNRAS.271..919L. doi:10.1093/mnras/271.4.919.
- Hema, B. P.; Pandey, Gajendra; Lambert, David L. (2012). "The Galactic R Coronae Borealis Stars: The C2 Swan Bands, the Carbon Problem, and the 12C/13C Ratio". The Astrophysical Journal. 747 (2): 102. arXiv:1201.1357. Bibcode:2012ApJ...747..102H. doi:10.1088/0004-637X/747/2/102. S2CID 118653032.
- White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. (2007). "High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun". The Astronomical Journal. 133 (6): 2524. arXiv:0706.0542. Bibcode:2007AJ....133.2524W. doi:10.1086/514336. S2CID 122854.
- ^ Stasińska, G.; Szczerba, R.; Schmidt, M.; Siódmiak, N. (2006). "Post-AGB stars as testbeds of nucleosynthesis in AGB stars". Astronomy and Astrophysics. 450 (2): 701. arXiv:astro-ph/0601504. Bibcode:2006A&A...450..701S. doi:10.1051/0004-6361:20053553. S2CID 12040452.
- Otero, Sebastian (23 November 2012). "V4199 Sgr". The International Variable Star Index. Retrieved 14 July 2014.
- ^ Kilkenny, D.; Westerhuys, J. E. (1990). "Spectroscopy of 'RCB' stars-IV. UX ANT". The Observatory. 110: 90–92. Bibcode:1990Obs...110...90K.
External links
"Post-AGB Object 279.064 +20.120". www.ncac.torun.pl.
"Light Curve of UX Ant". www.kusastro.kyoto-u.ac.jp.
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