SIMBAD references

2016ApJ...818..145B - Astrophys. J., 818, 145 (2016/February-3)

Pan-chromatic observations of the recurrent nova LMC 2009a (LMC 1971b).

BODE M.F., DARNLEY M.J., BEARDMORE A.P., OSBORNE J.P., PAGE K.L., WALTER F.M., KRAUTTER J., MELANDRI A., NESS J.-U., O'BRIEN T.J., ORIO M., SCHWARZ G.J., SHARA M.M. and STARRFIELD S.

Abstract (from CDS):

Nova LMC 2009a is confirmed as a recurrent nova (RN) from positional coincidence with nova LMC 1971b. The observational data set is one of the most comprehensive for any Galactic or extragalactic RN: optical and near-IR photometry from outburst until over 6 years later; optical spectra for the first 6 months, and Swift satellite ultraviolet (UV) and X-ray observations from 9 days to almost 1 year post-outburst. We find MV= -8.4±0.8r± 0.7s and expansion velocities between 1000 and 4000 km/s. Coronal line emission before day 9 indicates shocks in the ejecta. Strengthening of He iiλ4686 preceded the emergence of the super-soft source (SSS) in X-rays at ∼63-70 days, which was initially very variable. Periodic modulations, P = 1.2 days, most probably orbital in nature, were evident in the UV and optical from day 43. Subsequently, the SSS shows an oscillation with the same period but with a delay of 0.28P. The progenitor system has been identified; the secondary is most likely a sub-giant feeding a luminous accretion disk. Properties of the SSS infer a white dwarf (WD) mass 1.1 M≲ MWD≲ 1.3 M. If the accretion occurs at a constant rate, {dot}Macc ~= 3.6–2.5+4.7 x 10–7 M/yr is needed, consistent with nova models for an inter-eruption interval of 38 years, low outburst amplitude, progenitor position in the color-magnitude diagram, and spectral energy distribution at quiescence. We note striking similarities between LMC 2009a and the Galactic nova KT Eri, suggesting that KT Eri is a candidate RN.

Abstract Copyright:

Journal keyword(s): galaxies: individual: LMC - novae, cataclysmic variables - stars: individual: (Nova LMC 2009a, Nova LMC 1971b) - white dwarfs

Simbad objects: 16

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2020.02.19-09:30:01

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