Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apjs...39..513h&link_type=abstract
Astrophysical Journal Supplement Series, vol. 39, Apr. 1979, p. 513-535. Research supported by the Ministere de l'Education du
Astronomy and Astrophysics
Astrophysics
63
Binary Stars, Stellar Mass Accretion, Stellar Spectrophotometry, Variable Stars, Balmer Series, Continuous Spectra, Dwarf Stars, H Lines, Novae, Spectral Line Width, Stellar Models
Scientific paper
We present the results of an exploratory calculation of the theoretical photometric and spectroscopic properties of viscous accretion disks in cataclysmic variable systems. We use the theoretical α-model disks of Shakura and Sunyaev along with LTE model atmosphere calculations for plane-parallel geometry to obtain both continuum fluxes and hydrogen absorption line profiles for a variety of disk models. Our results are presented for mass-transfer rates ranging from 10-9 to 10-7 Msun yr-1, inclination angles ranging from 0° to 75°, and outer-disk radii ranging from 8.6 × 109 to 2.0 × 1010 cm. We tabulate line profiles and equivalent widths of Hα, Hβ, and Hγ the Balmer jump; bolometric correction; and both broad-band and Strömgren colors for most models. These results are then applied to a preliminary analysis of the Hγ absorption line profile in the nova-like variable CD 42°14462. The lack of agreement between the observed and theoretical profiles suggests that the observed line profile is predominantly pressure-broadened. This may possibly indicate that, in contrast to the results of our calculations, the observed profile originates in the innermost region of the disk and that this region contributes significantly to the visual light from the system.
Herter Terry
Lacasse Marc G.
Wesemael François
Winget Don E.
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