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Nova LMC 2009a as observed with XMM-Newton, compared with other novae

Orio, M, Dobrotka, A, Pinto, C, Henze, M, Ness, JU, Ospina, N, Pei, S, Behar, E, Bode, MF, Her, S, Hernanz, M and Sala, G (2021) Nova LMC 2009a as observed with XMM-Newton, compared with other novae. Monthly Notices of the Royal Astronomical Society, 505 (3). pp. 3113-3134. ISSN 0035-8711

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We examine four high-resolution reflection grating spectrometers (RGS) spectra of the February 2009 outburst of the luminous recurrent nova LMC 2009a. They were very complex and rich in intricate absorption and emission features. The continuum was consistent with a dominant component originating in the atmosphere of a shell burning white dwarf (WD) with peak effective temperature between 810 000 K and a million K, and mass in the 1.2-1.4 M⊙range. A moderate blue shift of the absorption features of a few hundred km s-1can be explained with a residual nova wind depleting the WD surface at a rate of about 10-8M⊙yr-1. The emission spectrum seems to be due to both photoionization and shock ionization in the ejecta. The supersoft X-ray flux was irregularly variable on time-scales of hours, with decreasing amplitude of the variability. We find that both the period and the amplitude of another, already known 33.3-s modulation varied within time-scales of hours. We compared N LMC 2009a with other Magellanic Clouds novae, including four serendipitously discovered as supersoft X-ray sources (SSS) among 13 observed within 16 yr after the eruption. The new detected targets were much less luminous than expected: we suggest that they were partially obscured by the accretion disc. Lack of SSS detections in theMagellanic Clouds novae more than 5.5 yr after the eruption constrains the average duration of the nuclear burning phase.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 The Author(s)] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Royal Astronomical Society
SWORD Depositor: A Symplectic
Date Deposited: 07 Nov 2022 14:42
Last Modified: 07 Nov 2022 14:45
DOI or ID number: 10.1093/mnras/stab1391
URI: https://researchonline.ljmu.ac.uk/id/eprint/18048
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