Extreme Ultraviolet Explorer investigation of three short-period binary stars

Details Extreme Ultraviolet Explorer investigation of three short-period binary stars Extreme Ultraviolet Explorer investigation of three short-period binary stars

Jan 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115..303r&link_type=abstract

Astronomical Journal, vol. 115, p. 303

Astronomy and Astrophysics

Astronomy

12

Extreme Ultraviolet Explorer Satellite, Binary Stars, Astronomical Photometry, Light Curve, Software Development Tools, Neutral Gases, Hydrogen

Scientific paper

Extreme Ultraviolet Explorer spectroscopic observations and photometric observations have been obtained for two contact binaries, 44i Boo B and VW Cep, and one close but detached binary, ER Vul. All three systems have orbital periods shorter than one day and thus are expected to show 'saturated' levels of chromospheric, transition region, and lower corona emissions. Only moderate flaring activity was seen in the DSS light curves of all three stars. The phased DSS light curve of 44i Boo B shows one minimum at the eclipse of the hotter, smaller component, while the phased light curve of ER Vul has a slightly higher level at the first maximum, following the deeper eclipse. An unsuccessful attempt has been made to determine the temperature dependence of the differential emission measure (DEM) of the coronal plasma for 44i Boo B on the basis of iron ion emission lines. It utilized the singular value decomposition formalism developed by Schmitt et al. (1996) to handle the inverse problem of the spectrum-to-DEM mapping. Implementation of this formalism suffered from the low number of available spectral features and possibly also inconsistencies in the line strengths, which become amplified in the mathematical inversion process. However, experiments with the direct reconstruction of the spectra favor the distribution of Dupree et al. (1996) in preference to the two-temperature model of McGale et al. (1996).

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