UX Antliae

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


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]

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