The Light Curve Analysis of AW Cam

Details The Light Curve Analysis of AW Cam The Light Curve Analysis of AW Cam

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jass...12...21k&link_type=abstract

Journal of Astronomy and Space Science, vol. 12, no. 1, p. 21-29.

Astronomy and Astrophysics

Astronomy

Scientific paper

The α Lyrae-type eclipsing binary AW Cam was observed photoelectrically in three wavelength regions. The obtained UBV light curves of AW Cam were analyzed with two separate modes (mode 2 for detached systems and mode 5 for semi-detached ones) of the Wilson-Devinney binary model. It is intended to resolve the discrepancy in AW Cam system that the photometric mass ratio (q = 0.21) derived by Russo and Milano (1983) is not consistent with the spectroscopic result (q = 0.43) by Mammano et al. (1967). Our photometric solutions derived with mode 2 are fitted better to the observed light curves than those of mode 5, supporting that AW Cam may be not a normal semi-detached system but a detached with the derived one. Three dimensional Roche configuration of AW Cam system calculated with the derived mass ratio (q = 0.43) reveals that the less massive secondary is well confined within its inner Roche lobe, while the more massive primary is in marginally contact. From the Roche geometry, the constancy of the orbital period and other photometric evidences of AW Cam, it is provisionally concluded that the system is an unevolved detached binary in the phase of case A evolution toward 'contact phase' rather than an evolved one in 'broken-contact phase' suggested by Giuricin and Mardrossian (1981).

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