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Title:
The Early X-Ray Emission from V382 Velorum (Nova Velorum 1999): An Internal Shock Model
Authors:
Mukai, Koji; Ishida, Manabu
Affiliation:
AA(NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771), AB(Institute of Space and Astronautical Science, 3-3-1 Yoshinodai, Sagamihara-shi, Kanagawa 229-8510, Japan)
Publication:
The Astrophysical Journal, Volume 551, Issue 2, pp. 1024-1030. (ApJ Homepage)
Publication Date:
04/2001
Origin:
UCP
ApJ Keywords:
Stars: Novae, Cataclysmic Variables, stars: individual (V382 Velorum), X-Rays: Stars
DOI:
10.1086/320220
Bibliographic Code:
2001ApJ...551.1024M

Abstract

We present the results of ASCA and RXTE observations of the early X-ray emission from the classical nova V382 Velorum. Its ASCA spectrum was hard (kT~10 keV) with strong (1023 cm-2) intrinsic absorption. In the subsequent RXTE data, the spectra became softer, because of both a declining temperature and a diminishing column. We argue that this places the X-ray emission interior to the outermost ejecta produced by V382 Vel in 1999, and therefore it must have been the result of a shock internal to the nova ejecta. The weakness of the Fe Kα lines probably indicates that the X-ray-emitting plasmas are not in ionization equilibrium.
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