Evolution of X-ray spectra and light curves of V1494 Aquilae
J.G. Rohrbach, J.-U. Ness, S. Starrfield

TL;DR
This study analyzes multiple Chandra X-ray observations of nova V1494 Aql, revealing spectral evolution, elemental abundances, and a transient flare, providing insights into the nova's outburst and post-outburst behavior.
Contribution
First detailed X-ray spectral and light curve analysis of V1494 Aql over several months, highlighting spectral changes, elemental abundances, and flare characteristics.
Findings
Increased N and O abundances in spectra
Detection of a transient flare with spectral line enhancements
Absence of significant periodicity in initial observations
Abstract
We present six Chandra X-ray spectra and light curves obtained for the nova V1494 Aql (1999 #2) in outburst. The first three observations were taken with ACIS-I on days 134, 187, and 248 after outburst. The count rates were 1.00, 0.69 and 0.53 cps, respectively. We found no significant periodicity in the ACIS light curves. The X-ray spectra show continuum emission and lines originating from N and O. We found acceptable spectral fits using isothermal APEC models with significantly increased elemental abundances of O and N for all observations. On day 248 after outburst a bright soft component appeared in addition to the fading emission lines. The Chandra observations on days 300, 304, and 727 were carried out with the HRC/LETGS. The spectra consist of continuum emission plus strong emission lines of O and N, implying a high abundance of these elements. On day 300, a flare occurred and…
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