From Wikipedia, the free encyclopedia
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]
Spectral type C(F) [4]
Variable type R CrB [5]
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]
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

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]

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


  1. ^ "Download Data". AAVSO. Retrieved 1 October 2021.
  2. ^ 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. doi: 10.1888/0333750888/2862.
  3. ^ Otero, Sebastian (23 November 2012). "UX Antliae". The International Variable Star Index. Retrieved 14 July 2014.
  4. ^ 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 (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. ^ 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. 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. ^ 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

"Post-AGB Object 279.064 +20.120".
"Light Curve of UX Ant".