OS Andromedae

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 mas[1]
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, 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 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]

  1. ^ a b c d e Cite error: The named reference Gaia DR2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference GCVS was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Schaefer2018 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Kato2007 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference hachisu2014 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aavso was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference hach was invoked but never defined (see the help page).