Hopkins Ultraviolet Telescope Observations of EX Hydrae

Details Hopkins Ultraviolet Telescope Observations of EX Hydrae Hopkins Ultraviolet Telescope Observations of EX Hydrae

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.7906g&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #79.06; Bulletin of the American Astronomical Society, Vol. 27, p.1398

Astronomy and Astrophysics

Astronomy

Scientific paper

We observed the intermediate polar EX Hya with the Hopkins Ultraviolet Telescope during the Astro-2 shuttle mission in 1995 March. The observation provides good signal to noise spectra on time scales of the order of 1 minute of the spectral region from the Lyman Limit to 1860 Angstroms with a resolution of about 3 Angstroms. The total observation time was 32 minutes, and covers phase phi_ {67} = 0.94 to 0.39 of the 67 minute white dwarf rotational period. At phi_ {67} = 0.0, the spectrum shows strong emission by C {IV} lambda1549 , C {III} lambda977 , lambda1176 , N V lambda1240 , Si IV lambda1394 , and a blend of lines including Ly beta . The observed FWHM of the lines is about 2400 km s(-1) , and decreases with phase. Weaker emission from C {II} lambda1335 , He {II} lambda1640 , and a blend of lines from 916-960 Angstroms is also apparent. As the phase increases to 0.39, the average continuum level decreases by about 20%, while the line emission decreases by more than a factor of 4. The profile of the C IV lambda1549 line changes considerably over the course of the observation, with a strong absorption appearing on the blue wing of the line from phi_ {67} = 0.25 to the end of the observation. The ratios C IV/N V and C IV/C III do not show any significant trend with phase. We also see fluctuations in the continuum flux of +/- 30% on timescales of about 2 minutes during the second half of the observation. This work was supported by NASA contract NAS 5-27000 to the Johns Hopkins University.

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