Observations and light curve solutions of the W UMa binaries V796 Cep, V797 Cep, CSS J015341.9+381641 and NSVS 3853195

Kjurkchieva, D.; Popov, V.; Ibryamov, S.; Vasileva, D.; Petrov, N.

doi:10.1088/1674-4527/17/5/42

Cited by 1 publication

(1 citation statement)

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“…The creation of a binary evolutional scheme requires knowledge of the fundamental parameters of components in W UMa binaries. The main goal of our intensive study of such targets (Kjurkchieva & Vasileva 2015;Kjurkchieva et al 2015b;Kjurkchieva et al 2015a;Kjurkchieva et al 2016b;Kjurkchieva et al 2016a;Kjurkchieva et al 2016c;Kjurkchieva et al 2017a;Kjurkchieva et al 2017b) is to determine their parameters by light curve solutions of our own data. They can be used also for improving the empirical relations describing W UMa-type systems.…”

Section: Introductionmentioning

confidence: 99%

Observations and light curve solutions of a selection of middle-contact W UMa binaries

Kjurkchieva

Popov

Vasileva

et al. 2018

Res. Astron. Astrophys.

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Photometric observations in Sloan g′ and i′ bands of W UMa binaries NSVS 4340949, T-Dra0–00959, GSC 03950–00707, NSVS 4665041, NSVS 4803568, MM Peg, MM Com and NSVS 4751449 are presented. The light curve solutions revealed that the components of each target are of G and K spectral types. The binaries of the sample have middle-contact configurations whose fillout factors are within the range 0.2–0.4. The only exception is NSVS 4751449 which is in deeper contact (fillout factor of 0.55). It precisely obeys the relation between mass ratio and fillout factor for deep, low mass ratio overcontact binaries. One of the eclipses of almost all targets (except MM Peg) is an occultation and their photometric mass ratios and solutions could be accepted with confidence. We found that the target components have almost equal temperatures but differ considerably in size and mass. The components of the partially-eclipsed MM Peg have close parameters. Our solutions reveal that NSVS 4340949, T-Dra0–00959, NSVS 4803568 and MM Com are of W subtype while GSC 03950–00707, NSVS 4665041, MM Peg and NSVS 4751449 are of A subtype. This subclassification is well-determined for all totally-eclipsed binaries. The targets confirm the trends in which W-subtype systems have smaller periods and lower temperatures than A subtype binaries.

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