UX Antliae

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UX Antliae
UXAntLightCurve.png
The visual band light curve of UX Antliae, from AAVSO data [1]
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Antlia
Right ascension 10h 57m 09.059s [2]
Declination −37° 23′ 55.13″ [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: −2,012 [2] mas/yr
Dec.: +0.487 [2] mas/yr
Parallax (π)0.0445±0.0197  mas
Distance approx. 70,000  ly
(approx. 22,000  pc)
Absolute magnitude  (MV)~−5 [4]
Details
Mass 0.722 [7]   M☉
Surface gravity (log g)0.5 [7]   cgs
Temperature 7,000 [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
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. [8]

Contents

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. 1 2 3 4 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. ↑ Otero, Sebastian (23 November 2012). "UX Antliae". The International Variable Star Index. Retrieved 14 July 2014.
  4. 1 2 3 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. 1 2 3 4 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. 1 2 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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