Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..349b&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 3, July 1980, p. 349-353.
Astronomy and Astrophysics
Astrophysics
29
Binary Stars, Novae, Stellar Spectra, White Dwarf Stars, X Ray Stars, Balmer Series, Emission Spectra, Spectral Line Width
Scientific paper
Spectroscopic observations of the dwarf nova and X-ray binary EX Hydrae were obtained with a dispersion of 124 A/mm and high time resolution (15 min). The spectrum is characterised by the emission lines of the Balmer Series, of He I and He II. The strongest lines show duplicity, with a separation of 1,000-1,400 km/sec. The Balmer emission line profiles are superimposed by a narrow S-wave component which apparently originates in the gas stream from L1. The equivalent widths of all emission lines are variable and correlated with the phase of the recently detected 67-min cycle, which is mainly a periodic modulation of the visual continuum flux. Maximal equivalent width closely coincides with maximal continuum intensity and with maximal X-ray flux, which is shown also to vary with the 67-min period.
Breysacher Jacques
Vogt Nicolas
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