Is the ROSAT Wide Field Camera EUV source and AM eclipsing binary, Delta Capricorni, also a Delta Scuti variable?

Details Is the ROSAT Wide Field Camera EUV source and AM eclipsing binary, Delta Capricorni, also a Delta Scuti variable? Is the ROSAT Wide Field Camera EUV source and AM eclipsing binary, Delta Capricorni, also a Delta Scuti variable?

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.266l..13l&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 266, p. L13-L16

Astronomy and Astrophysics

Astronomy

3

Eclipsing Binary Stars, Variable Stars, Light Curve, Periodic Variations, Stellar Spectra, Astronomical Photometry, Ultraviolet Astronomy

Scientific paper

No. The eclipsing binary light curve of Delta Cap shows unexpectedly large scatter which in the past has been assumed to be due to a Delta Scuti-like variation. However, an analysis of the published photometry finds no evidence to support a short-period variation in this system. The upper limit of any periodic variation is less than 0.008 mag in B and less than 0.007 mag in V. The dominant cause of the observed scatter in the photometry is most probably a combination of random noise and instrumental differences between observers. Although there is no direct evidence to support it, there is a possibility that spots on the active secondary contribute to the scatter in the broadband photometry. Phase-dependent H-alpha variations may require an explanation, and material held in magnetic loops or plages on the secondary are likely candidates. Reports of the period being variable are found to be misplaced. Delta Cap is probably a constant metallic-lined A star with a mildly chromospherically active cool companion.

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