Computer Science
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982esasp.176..201s&link_type=abstract
In ESA 3rd European IUE Conf. p 201-202 (SEE N83-11889 02-88)
Computer Science
Near Ultraviolet Radiation, Novae, Stellar Spectra, Variations, Accretion Disks, Chromosphere, Line Spectra, Stellar Coronas, Stellar Envelopes, Stellar Mass Accretion
Scientific paper
One high resolution spectrum and five low resolution ones of nova Aql, taken by IUE, are discussed. All the emission lines, being so wide and shallow that they cannot be detected in the high resolution spectrum, are very probably formed in the accretion disk. There is no contribution from the chromospheric transition region of the red companion, nor is there any trace of any nebular contribution from the envelope ejected at the time of the outburst. Coronal lines might be present. There are variations in the lines (by a factor of 2) and in the continuum (by a factor of 1.3) among spectra taken in close sequence. It is questionable, however, whether these variations are intrinsically phase related. The observed maximum of the Mg II emission and of the continuum around phase = 0 might be attributed to a transient phenomenon. This might explain the disagreement with the visible data and the previous far UV observations.
Cassatella Angelo
Selvelli Pier Luigi
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