A&A 431, 321-328 (2005)
DOI: 10.1051/0004-6361:20041396

Modeling CHANDRA low energy transmission grating spectrometer observations of classical novae with PHOENIX

I. V4743 Sagittarii

A. Petz¹, P. H. Hauschildt¹, J.-U. Ness¹ and S. Starrfield<sup>2

1</sup>  Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
    e-mail: [apetz;yeti;jness]@hs.uni-hamburg.de
²  Department of Physics and Astronomy, Arizona State University, Tempe, AZ 58287-1504, USA
    e-mail: starrfield@asu.edu

(Received 3 June 2004 / Accepted 1 October 2004 )

Abstract
We use the PHOENIX code package to model the X-ray spectrum of Nova V4743 Sagittarii observed with the LETGS onboard the Chandra satellite 19 March 2003. Our atmosphere models are 1D spherical, expanding, line blanketed, and in full non-local thermodynamic equilibrium. To analyze nova atmospheres and related systems with an underlying nuclear burning envelope at X-ray wavelengths, it was necessary to update the code with new microphysics, as discussed in this paper. We demonstrate that the X-ray emission is dominated by thermal bremsstrahlung and that the hard X-rays are dominated by Fe and N absorption. The best fit to the observation is provided at a temperature of  = 5.8  10⁵ K, with  = 50 000  . The models are calculated for solar abundances. It is shown that the models can be used to determine abundances in the nova ejecta.

Key words: stars: novae, cataclysmic variables -- X-rays: individuals: V4743 Sgr -- stars: atmospheres -- atomic data

SIMBAD Objects

© ESO 2005

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

• If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
• You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
• You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.