OS Andromedae

OS Andromedae, known also as Nova Andromedae 1986, is a classical nova that appeared in the constellation Andromeda during 1986. It reached a peak apparent visual magnitude of 6.3 and had an intrinsic decay time (for a three magnitude drop) of 25 days. At the estimated distance of 4.2 kiloparsec, its absolute magnitude at the peak was -7.56.[4]

OS Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  23h 12m 05.9361s[1]
Declination +43° 28′ 19.4899″[1]
Apparent magnitude (V) 6.3 - 18.0[2]
Characteristics
Variable type Nova[3]
Astrometry
Proper motion (μ) RA: −1.944±0.211[1] mas/yr
Dec.: −0.368±0.204[1] mas/yr
Parallax (π)0.1378 ± 0.1377[1] mas
Distance3298+1670
−524[3] pc
Absolute magnitude (MV)−7.56[4] - +3.3[5]
Details
White dwarf
Mass1.0[4] M☉
Luminosity84,000 (max)[4] L☉
Donor star
Other designations
AAVSO 2307+46, Nova And 1986, Gaia DR2 1942264441241366144[3][6]
Database references
SIMBADdata

OS Andromedae was discovered when it was at 8th magnitude on December 5th. It reached its peak brightness two days later[5] A sudden decrease in visual and ultraviolet light, which occurred 30 days after the peak, was due to dust formation during the nova event. It was estimated that 3.5×10−5 M☉ was ejected during the event. The chemical composition is typical of a CO nova.[4]

References
  1. 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.
  2. N. N. Samus; O. V. Durlevich; et al. "OS And database entry". Combined General Catalog of Variable Stars (2017 ed.). CDS. Retrieved 2018-11-12.
  3. Schaefer, Bradley E. (2018). "The distances to Novae as seen by Gaia". Monthly Notices of the Royal Astronomical Society. 481 (3): 3033–3051. arXiv:1809.00180. Bibcode:2018MNRAS.481.3033S. doi:10.1093/mnras/sty2388.
  4. Kato, M.; Hachisu, I. (March 2007). "Modeling of the Super-Eddington Phase for Classical Novae: Five IUE Novae". The Astrophysical Journal. 657 (2): 1004–1012. arXiv:astro-ph/0611594. Bibcode:2007ApJ...657.1004K. doi:10.1086/511058.
  5. Hachisu, Izumi; Kato, Mariko (2014). "The UBV Color Evolution of Classical Novae. I. Nova-giant Sequence in the Color-Color Diagram". The Astrophysical Journal. 785 (2): 97. arXiv:1401.7113. Bibcode:2014ApJ...785...97H. doi:10.1088/0004-637X/785/2/97.
  6. "OS Andromedae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-21.
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