Non-LTE Calculation of Helium I line Emission from Cataclysmic Variable Stars

Details Non-LTE Calculation of Helium I line Emission from Cataclysmic Variable Stars Non-LTE Calculation of Helium I line Emission from Cataclysmic Variable Stars

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mst...........n&link_type=abstract

Master Science Thesis, Central Michigan University

Physics

2

Variable Stars: Cataclysmic, Accretion Disks, He I Emission

Scientific paper

We undertook a non-LTE radiative transfer calculation to determine the helium I line strengths from accretion disks of cataclysmic variable stars. Until very recently the helium I line strengths seemed puzzling because it was believed that these accretian disks were too cool to excite this emission. It is now generally accepted that the helium I emissions come from hot "chromospheres" at the top and bottom of the disk. The results obtained show that the helium I emission lines can come from these chromospheres. The results show that the helium lines are indeed potentially the best probes of the temperature and density in these chromospheres.

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