OS Andromedae

OS Andromedae, known also as Nova Andromedae 1986, is a classical nova that appeared in the constellation Andromeda during 1986. It was discovered at 10:34 UT on 5 December 1986 by Mitsuri Suzuki, a 28-year-old school teacher living in Ena, Japan. He photographed the portion of the Milky Way that passes through northern Andromeda with a 200-mm telephoto lens, and found the nova when its apparent magnitude was 8.0. Two days later it reached a peak apparent visual magnitude of 6.3.[7][5]

OS Andromedae
Location of OS Andromedae (circled in blue)
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 12m 05.936s[1]
Declination +47° 28′ 19.49″[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
The light curve of OS Andromedae, plotted from AAVSO data

OS Andromedae had an intrinsic decay time (for a three magnitude drop) of 25 days, making it a "fast" nova. A sudden decrease in visual and ultraviolet light, which occurred 30 days after the peak, was due to dust formation during the nova event. The mass of the white dwarf has been estimated to be 1.05 M☉[8] and it was estimated that 3.5×10−5 M☉ was ejected during the event. The chemical composition is typical of a CO nova.[4] At the estimated distance of 4.2 kiloparsec, its absolute magnitude at the peak was -7.56.[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. S2CID 118925493.
  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. S2CID 118993608.
  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. S2CID 118536980.
  6. "OS Andromedae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-21.
  7. "OS And (Nova Andromedae 1986)". aavso.org. AAVSO. Retrieved 2 January 2021.
  8. Hachisu, Izumi; Kato, Mariko (June 2019). "A Light-curve Analysis of 32 Recent Galactic Novae: Distances and White Dwarf Masses". The Astrophysical Journal Supplement Series. 242 (2): 18. arXiv:1905.10655. Bibcode:2019ApJS..242...18H. doi:10.3847/1538-4365/ab1b43. S2CID 166228785.
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