UX Antliae


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.[8]

UX Antliae

The visual band light curve of UX Antliae, from AAVSO data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis
Right ascension 10h 57m 9.051s[2]
Declination −37° 23′ 55.06″[2]
Apparent magnitude (V) 11.85 - 18.0[3]
Characteristics
Spectral type C(F)[4]
Variable type R CrB[5]
Astrometry
Radial velocity (Rv)27.83[6] km/s
Proper motion (μ) RA: -3.8[2] mas/yr
Dec.: 2.3[2] mas/yr
Distance~25,000[4] pc
Absolute magnitude (MV)~−5[4]
Details
Mass0.722[7] M☉
Surface gravity (log g)0.5[7] cgs
Temperature7,000[7] 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
SIMBADdata

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.[9] It had been suspected of being one since 1940, but had been little-studied and exhibited no characteristic declines between 1975 and 1990.[4]

Assuming that its absolute magnitude is around -5, it has been estimated as lying 25000 parsecs distant from Earth.[4] Kilkenny and Westerhuys noted that its spectrum fit with that of a star of spectral class F, although was deficient in hydrogen.[9] It has around 70% the mass of the Sun and an effective (surface) temperature of around 7000 K.[7]

See also

References
  1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
  2. 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.
  3. Otero, Sebastian (23 November 2012). "UX Antliae". The International Variable Star Index. Retrieved 14 July 2014.
  4. 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.
  5. 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.
  6. 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.
  7. 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.
  8. Otero, Sebastian (23 November 2012). "V4199 Sgr". The International Variable Star Index. Retrieved 14 July 2014.
  9. Kilkenny, D.; Westerhuys, J. E. (1990). "Spectroscopy of 'RCB' stars-IV. UX ANT". The Observatory. 110: 90–92. Bibcode:1990Obs...110...90K.

"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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