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A remarkable recurrent nova in M 31: The optical observations
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SYSNO ASEP 0429426 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title A remarkable recurrent nova in M 31: The optical observations Author(s) Darnley, M.J. (GB)
Williams, S.C. (GB)
Bode, M.F. (GB)
Henze, M. (DE)
Ness, J.-U. (ES)
Shafter, A.W. (US)
Hornoch, Kamil (ASU-R) ORCID
Votruba, Viktor (ASU-R) RIDSource Title Astronomy & Astrophysics. - : EDP Sciences - ISSN 0004-6361
Roč. 563, March (2014), L9/1-L9/4Number of pages 4 s. Publication form Print - P Language eng - English Country FR - France Keywords galaxies: individual: M 31 ; novae ; cataclysmic variables Subject RIV BN - Astronomy, Celestial Mechanics, Astrophysics R&D Projects LG12001 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support ASU-R - RVO:67985815 UT WOS 000333798000154 DOI 10.1051/0004-6361/201423411 Annotation In this Letter we address the optical lightcurve and progenitor system of M 31N 2008-12a. Photometry of the 2013 eruption, combined with three previous eruptions, enabled construction of a template lightcurve of a very fast nova (t2(V)~=4 days). The archival data allowed recovery of the progenitor system in optical and near-UV data, indicating a red-giant secondary with bright accretion disk, or alternatively a system with a sub-giant secondary but dominated by a disk. The eruptions of M 31N 2008-12a, and a number of historic X-ray detections, indicate a unique system with a recurrence timescale of ~1 yr. This implies the presence of a very high-mass white dwarf and a high accretion rate. The recovered progenitor system is consistent with such an elevated rate of accretion. We encourage additional observations, especially towards the end of 2014. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2015
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