Photometric Study of Three Short-Period Eclipsing Binaries from the ASAS Catalogue (original) (raw)

2013, International Journal of Astronomy and Astrophysics

We present the results of our study of three previously unstudied short-period eclipsing binaries, namely: ASAS 110609 − 2045.3, ASAS105331 − 7424.7, and ASAS 130057 + 2120.3. Using the visual (V)-band data obtained from the ASAS catalogue, the orbital and physical parameters of the systems were derived for the first time using the Wilson-Divenney (WD) codes. Our investigation revealed that ASAS 110609 − 2045.3 is a near-contact binary star of the W Uma type having an angle of inclination of 80˚ ± 1, a mass ratio of about 0.5, an orbital period of 0.2933 ± 0.0130 days, and an effective temperature in the range of 5800 K-6200 K, making it a G2V-F7V spectral system. ASAS 105331 − 7424.7 was established to be an over-contact binary system of the W Uma type, inclined at 86˚ ± 2 to the line of sight, having a mass ratio of about 0.9, a period of 0.4825 ± 0.0002, and an effective temperature in the range of 5200 K-5300 K, making it a K2V-K0V spectral system. A third light factor of just 0.1 was established for the system, however, no evidence of starspots or discs was inferred for either component. ASAS 130,057 + 2120.3 is a W Uma binary having a mass ratio of about 0.6 in a state of marginal contact. Its orbital inclination is 55˚ ± 1; the effective temperature is in the range of 6200 K-6500 K, making it a F7V-F5V stellar system. The system showed evidence of third light, with a third light factor of 0.6, however, the presence of spots or discs could not be established for either component. The deduced period was 0.8930 ± 0.0014 days. None of the systems showed any evidence of the O'Connell effect on either component.