UX Antliae

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UX Antliae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis
Right ascension 10h 57m 9.051s[1]
Declination −37° 23′ 55.06″[1]
Apparent magnitude (V) 11.85 - 18.0[2]
Characteristics
Spectral type C(F)[3]
Variable type R CrB[4]
Astrometry
Radial velocity (Rv) 27.83[5] km/s
Proper motion (μ) RA: -3.8[1] mas/yr
Dec.: 2.3[1] mas/yr
Distance ~25,000[3] pc
Absolute magnitude (MV) ~−5[3]
Details
Mass 0.722[6] M
Surface gravity (log g) 0.5[6] cgs
Temperature 7,000[6] 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 post-AGB star. It is an R Coronae Borealis variable star that has a base apparent magnitude of around 11.85, with irregular dimmings down to below magnitude 18.0.[2]

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.[7] It had been suspected of being one since 1940, but had been little-studied and exhibited no characteristic declines between 1975 and 1990.[3]

Assuming that its absolute magnitude is around -5, it has been estimated as lying 25000 parsecs distant from Earth.[3] Kilkenny and Westerhuys noted that its spectrum fit with that of a star of spectral class F, although was deficient in hydrogen.[7] It has around 70% the mass of the Sun and a effective (surface) temperature of around 7000 K.[6]

See also[edit]

R Coronae Borealis

References[edit]

  1. ^ a b c d 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. 
  2. ^ a b Otero, Sebastian (23 November 2012). "UX Antliae". The International Variable Star Index. Retrieved 14 July 2014. 
  3. ^ a b c d e 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: 919–23. Bibcode:1994MNRAS.271..919L. 
  4. ^ 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. Bibcode:2012ApJ...747..102H. doi:10.1088/0004-637X/747/2/102. 
  5. ^ 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. Bibcode:2007AJ....133.2524W. doi:10.1086/514336. 
  6. ^ a b c d 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. Bibcode:2006A&A...450..701S. doi:10.1051/0004-6361:20053553. 
  7. ^ a b Kilkenny, D.; Westerhuys, J. E. (1990). "Spectroscopy of 'RCB' stars-IV. UX ANT". The Observatory 110: 90–92. Bibcode:1990Obs...110...90K. 

External links[edit]

"Post-AGB Object 279.064 +20.120". www.ncac.torun.pl. 
"Light Curve of UX Ant". www.kusastro.kyoto-u.ac.jp.