International Journal of Astronomy and Astrophysics

Volume 3, Issue 2 (June 2013)

ISSN Print: 2161-4717   ISSN Online: 2161-4725

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Photometric Study of Three Short-Period Eclipsing Binaries from the ASAS Catalogue

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DOI: 10.4236/ijaa.2013.32014    4,969 Downloads   7,249 Views  Citations
Author(s)

ABSTRACT

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.

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Obu, J. and Okeke, P. (2013) Photometric Study of Three Short-Period Eclipsing Binaries from the ASAS Catalogue. International Journal of Astronomy and Astrophysics, 3, 123-130. doi: 10.4236/ijaa.2013.32014.

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