Photometric Study of the W UMA Type Eclipsing Binary AK Herculis

Details Photometric Study of the W UMA Type Eclipsing Binary AK Herculis Photometric Study of the W UMA Type Eclipsing Binary AK Herculis

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jass...16...21p&link_type=abstract

Journal of Astronomy and Space Sciences, vol. 16, no. 1, p. 21-30.

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We perform CCD observations in V RI lters for AK Her during 3 nights in Feb 1997 and Mar 1998 at Mt. Sobaek National Observatory, and obtained 236 images in V, 198 in R, and 197 in I lter. From the data, we construct light curves which contain a pair primary and secondary minima and (O-C) diagram. We analyzed the obtained light curves of AK Her using the Wilson-Devinney code. From the analyses, we find that AK Her is more likely detached or semi-detached than contact system. From the (O-C) diagram, we nd that the (O-C) residuals increases out of accordance with the expectation of Borkovits & Hegedus since 1990. However, we cannot identify cause of the periodic variation of the (O-C) residuals.

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