| Issue |
A&A
Volume 439, Number 1, August III 2005
|
|
|---|---|---|
| Page(s) | 205 - 211 | |
| Section | Stellar structure and evolution | |
| DOI | https://doi.org/10.1051/0004-6361:20052688 | |
| Published online | 22 July 2005 | |
Classical novae in outburst: evolution of the ultraviolet emission lines in CO novae
1
INAF, Istituto di Fisica dello Spazio Interplanetario, Via del Fosso del Cavaliere 100, 00133 Rome, Italy e-mail: cassatella@fis.uniroma3.it
2
Dipartimento di Fisica E. Amaldi, Università Roma Tre, Via della Vasca Navale 84, 00146 Rome, Italy
3
XMM Science Operation Centre, ESAC, Villafranca Satellite Tracking Station, PO Box 50727, 28080 Madrid, Spain
Received:
12
January
2005
Accepted:
11
March
2005
A comparative study is made of the temporal changes of the
ionization level in seven CO novae well monitored with the IUE
satellite at low resolution. The investigation is based on the
evolution of the fluxes in eight strong ultraviolet emission lines
covering a wide range of ionization potentials, from 
(7.6 eV) to 
(77.5 eV). We find that the rate of increase of the
ionization conditions in the emitting regions is uniform in the sample
of novae considered, provided the time scale is normalized to the
optical decay time t3. The implications of this result for the nova
ejected masses and for the nuclear turnoff time are discussed.
Key words: stars: novae, cataclysmic variables / techniques: image processing / ultraviolet: stars / methods: data analysis
© ESO, 2005
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