U Monocerotis

U Monocerotis

A visual band light curve for U Monocerotis, adapted from Pollard et al. (2006)[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Monoceros
Right ascension 07h 30m 47.473s[2]
Declination −09° 46′ 36.79″[2]
Apparent magnitude (V) 5.45 - 7.67[3]
Characteristics
Spectral type F8eIb - K0pIb[4]
U−B color index +0.47 - +1.22[5]
B−V color index +0.81 - +1.27[5]
Variable type RVb[6]
Astrometry
Radial velocity (Rv)32[7] km/s
Proper motion (μ) RA: −10.124[2] mas/yr
Dec.: 3.268[2] mas/yr
Parallax (π)0.9161 ± 0.0915 mas[2]
Distance3,600 ± 400 ly
(1,100 ± 100 pc)
Absolute magnitude (MV)−4.516[8]
Details
Mass2.00+1.07
−0.72[8] M☉
Radius100.3+18.9
−13.2[8] R☉
Luminosity5,480+1,753
−882[8] L☉
Surface gravity (log g)0.0[9] cgs
Temperature5,000[8] (4,930-5,830[5]) K
Metallicity−0.8[9]
Other designations
U Mon, HIP 36521, 2MASS J07304746-0946366, BD−09°2085, HD 59693, TYC 5400-4699-1, GCRV 5005, AAVSO 0726-09, IRAS 07284-0940
Database references
SIMBADdata

U Monocerotis (U Mon) is a pulsating variable star and spectroscopic binary in the constellation Monoceros. The primary star is an RV Tauri variable, a cool luminous post-AGB star evolving into a white dwarf.

  1. ^ Cite error: The named reference pollard was invoked but never defined (see the help page).
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ Watson, C.; Henden, A. A.; Price, A. (2015). "AAVSO International Variable Star Index VSX". CDS/ADC Collection of Electronic Catalogues. 1.
  4. ^ Rosino, L. (1951). "The Spectra of Variables of the RV Tauri and Yellow Semiregular Types". Astrophysical Journal. 113: 60. Bibcode:1951ApJ...113...60R. doi:10.1086/145377.
  5. ^ a b c Dawson, D. W. (1979). "A photometric investigation of RV Tauri and yellow semiregular variables". Astrophysical Journal Supplement Series. 41: 97. Bibcode:1979ApJS...41...97D. doi:10.1086/190610.
  6. ^ Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  7. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Washington: 0. Bibcode:1953GCRV..C......0W.
  8. ^ a b c d e Bódi, A.; Kiss, L. L. (2019). "Physical properties of galactic RV Tauri stars from Gaia DR2 data". The Astrophysical Journal. 872 (1): 60. arXiv:1901.01409. Bibcode:2019ApJ...872...60B. doi:10.3847/1538-4357/aafc24. S2CID 119099605.
  9. ^ a b Cite error: The named reference ruyter was invoked but never defined (see the help page).