Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...268..694r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 268, no. 2, p. 694-704.
Astronomy and Astrophysics
Astrophysics
17
Dwarf Novae, Stellar Spectrophotometry, Absorption Spectra, Emission Spectra, Power Spectra, Radial Velocity, Spectral Line Width, Stellar Orbits
Scientific paper
We present spectroscopic observations of the dwarf nova KT Per in the red spectral range during outburst, and in the red and blue in quiescence. Radial velocity measurements of the emission lines yield an orbital period of 3h 55.l m. The structure and the phase dependent behavior of the lines in both photometric states is quite complicated, and many but not all features are modulated with the binary orbit. We conclude that the distribution of the emission within the KT Per system is not well described by a symmetric accretion disk. In particular, we see a region of enhanced emission under an angle of 45 deg (in quiescence) from the line connecting the components as seen from the white dwarf in the direction opposite to that of the location of the hot spot. This angle increases to 120 deg in outburst. Moreover, there appears to be an emission component which is always redshifted with respect to the observer and which can thus not be tied to the binary orbit. As a most unexpected feature, KT Per exhibits absorption lines of Na D and of unclear origin close to 6280 A during outburst. These lines could not be seen in quiescence.
Bruch Albert
Díaz Marco
Ratering C.
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