TITLE:
Photometric Study of Three Short-Period Eclipsing Binaries from the ASAS Catalogue
AUTHORS:
J. A. Obu, P. N. Okeke
KEYWORDS:
Binaries; Eclipsing—Stars; Starspots—Stars; Fundamental Parameters—Individual; ASAS 110609 ? 2045.3; ASAS 105331 ? 7424.7; ASAS 130057 + 2120.3
JOURNAL NAME:
International Journal of Astronomy and Astrophysics,
Vol.3 No.2,
June
7,
2013
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.