Computer Science – Sound
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.292..385m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 292, p. 385
Computer Science
Sound
8
Cataclysmic Variables, Accretion Disks, H Lines, Spectral Line Width, Balmer Series, Metallicity, Line Shape, Calcium, Doppler Effect, Interpolation, Supersonic Speed
Scientific paper
We present a new test of the widths of the local line profiles from the accretion disks of cataclysmic variable stars. Our method is based on the near coincidence of the Ca II H line at 3968.5 A and the H-epsilon line at 3970.1 A. If at any point in the disk the profiles of these lines overlap, the total flux seen will in general not be the sum of the individual fluxes; if the profiles do not overlap, the fluxes will add linearly. This diagnostic applies independently of the Doppler broadening from the disk. We estimate the 'true' H-epsilon flux from interpolation between neighboring members of the Balmer series. Subtracting this flux from the combined flux of the He/Ca II H blend leaves the Ca II H flux, which can be compared with the flux of the isolated Ca II K line. We find that the Ca II IR triplet lines at 8498, 8542 and 8662 A show optically thick flux ratios close to 1, implying that the H/K ratio should also be close to 1, whereas the observed ratios are close to 0.5. Our results show that although H-epsilon is separated by 120 km/s from Ca II H, compared with a sound speed of only about 10 km/s, the lines are overlapping so that the Ca II H emission is suppressed.
Dhillon Vik S.
Marsh Thomas R.
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