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DN Geminorum or Nova Geminorum 1912 was a classical nova which lit up in 1912 in the constellation Gemini. It was discovered by Norwegian variable star observer Sigurd Einbu[3] on March 12, 1912 before reaching peak brightness, which allowed early-stage spectra to be collected by Yerkes Observatory.[5] The nova reached a maximum brightness of around 3.5 mag before declining,[6] which means it was visible to the naked eye. Its brightness decreased over the following 36 days by 3 magnitudes as it gradually faded from sight. The light curve saw two maxima a few months after the outburst, along with strong oscillations.[6] Today its brightness is visual magnitude 15.5.[2]

DN Geminorum
Location of DN Geminorum (circled in red)
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 06h 54m 54.34929s[1]
Declination +32° 08′ 27.9247″[1]
Apparent magnitude (V) 15.5±0.5[2]
Astrometry
Proper motion (μ) RA: −0.794[1] mas/yr
Dec.: −4.323[1] mas/yr
Parallax (π)0.7288 ± 0.0807 mas[1]
Distanceapprox. 4,500 ly
(approx. 1,400 pc)
Absolute magnitude (MV)5.02±0.60[2]
Details
White dwarf
Mass0.93±0.15[2] M☉
Other designations
Nova Gem 1912, Nova Geminorum II[3], DN Gem, HD 50480[4]
Database references
SIMBADdata
The light curve of DN Geminorum, plotted from AAVSO data
The light curve of DN Geminorum, plotted from AAVSO data

This is a close binary star system consisting of a white dwarf with 93%[2] of the Sun's mass – the source for the nova explosion – and a lower mass red dwarf[6] companion from which the white dwarf is accreting matter.[2] The system is located approximately 4,500 light years from the Sun based on parallax, with its visual magnitude being diminished by an extinction of 0.53±0.12 due to interstellar dust.[2] Observations of this system showed a sinusoidal variation in luminosity with a period of 3.06840 ± 0.00012 h, which is likely the orbital period for the pair. This oscillation may be caused by irradiation of the companion star by the white dwarf.[6]


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. Selvelli, Pierluigi; Gilmozzi, Roberto (February 2019), "A UV and optical study of 18 old novae with Gaia DR2 distances: mass accretion rates, physical parameters, and MMRD", Astronomy & Astrophysics, 622: 16, arXiv:1903.05868, Bibcode:2019A&A...622A.186S, doi:10.1051/0004-6361/201834238, S2CID 119234563, A186.
  3. Pettersen, Bjørn Ragnvald (November 2012), "Sigurd Enebo and Variable Star Research: Nova Geminorum 1912 and the RV Tauri Stars", Journal of Astronomical History and Heritage, 15 (3): 246–254, Bibcode:2012JAHH...15..246P.
  4. "DN Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-08-15.
  5. Yerkes Observatory (June 14, 1912), "Note on Nova Geminorum 1912", Monthly Notices of the Royal Astronomical Society, 72 (8): 675–676, doi:10.1093/mnras/72.8.675.
  6. Retter, A.; et al. (September 1999), "An irradiation effect in Nova DN GEM 1912 and the significance of the period gap for classical novae", Monthly Notices of the Royal Astronomical Society, 308 (1): 140–146, arXiv:astro-ph/9905375, Bibcode:1999MNRAS.308..140R, doi:10.1046/j.1365-8711.1999.02704.x, S2CID 14377631.

На других языках

[de] Nova Geminorum 1912

DN Geminorum oder Nova Geminorum 1912 war eine Nova im Sternbild Zwillinge, die am 13. März 1912 von Sigurd Enebo im norwegischen Dombås entdeckt wurde. Sie erreichte eine Helligkeit von 3,5 mag. Ihre Helligkeit nahm in 36 Tagen um 3 mag ab. Heute ist ihre Helligkeit 15 mag.
- [en] DN Geminorum

[ru] DN Близнецов

DN Близнецов (лат. DN Geminorum, HD 50480) — медленная новая, двойная катаклизмическая переменная звезда в созвездии Близнецов на расстоянии (вычисленном из значения параллакса) приблизительно 4 475 световых лет (около 1 372 парсек) от Солнца. Видимая звёздная величина звезды — от +15,76m до +3,6m[4]. Орбитальный период — около 3,0684 часов.


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