Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.201..421m&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 201, Nov. 1982, p. 421-427. Research supported by the Science and Engin
Astronomy and Astrophysics
Astronomy
18
Eclipsing Binary Stars, Stellar Spectra, Variable Stars, Digital Techniques, Line Spectra, Radial Velocity, Spectral Line Width
Scientific paper
Spectroscopic data on the eclipsing binary system ER Vul are analyzed to derive radial velocity curves and the relative spectrum strength of each component. Coude spectrograms were made during the period of Aug. 21-24, 1980, using baked IIa-O plates and an average exposure time of 20 min. Microdensitometry was performed on the plates to obtain radial velocities with a 3-4 km/sec standard deviation. A phase-dependent change in the broadening spectrum was observed. The strength of the secondary lines remained relatively constant while the primary displayed a steady decrease in strength with phase. It is suggested that Thomson scattering in the ionized gas surrounding the stars takes place among free electrons, thus perturbing the observed light curves. Further studies to examine additional effects by sunspots using photometry and spectroscopy simultaneously are indicated.
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