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Photometric study of eclipsing binaries in the Large Magellanic Cloud--I.W UMa type binaries in the Large Magellanic Cloud

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Research in Astronomy and Astrophysics 2011年第2期11卷 175-180页

作者： devarapalli shanti priya Kandulapati Sriram Pasagada Vivekananda Rao Department of Astronomy Osmania University Korea Astronomy and Space Science Institute

Eclipsing binaries are among the most important sources of information on stellar parameters like radii,masses,luminosities,*** present the analysis of six W UMa systems discovered in the Large Magellanic Cloud using ... 详细信息

关键词： binaries: eclipsing -- binaries: close

Photometric study of an eclipsing binary in the field of M37

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Research in Astronomy and Astrophysics 2014年第9期14卷 1166-1172页

作者： devarapalli shanti priya Kandulapati Sriram Pasagada Vivekananda Rao Department of Astronomy Osmania University Hyderabad 500 007 India

CCD photometric observations with B and V passbands were performed on the contact binary V3 in the field of open cluster M37. The solutions were obtained for data from both B and V passbands along with R passband given by Hartman et al. using the Wilson-Devinney code. The positive O＇Connell effect was observed in all the three passbands and its associated cool spot parameters were derived. The results indicate that the spot parameters have not shown any significant variability during the last four years. The spot radius was found to be 40° and located close to the equator of the secondary component. The absolute parameters of the system were derived using the empirical relations given by Gazeas et al.

关键词： binaries: eclipsing -- binaries: close

Photometric study of an eclipsing binary in Praesepe

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Research in Astronomy and Astrophysics 2013年第4期13卷 465-470页

作者： devarapalli shanti priya Kandulapati Sriram Pasagada Vivekananda Rao Department of Astronomy Osmania University Korea Astronomy and Space Science Institute

We present CCD photometric observations of an eclipsing binary in the direction of the open cluster Praesepe using the 2 m telescope at IUCAA Girawali Observatory, India. Though the system was classified as an eclipsing binary by Pepper et al., detailed investigations have been lacking. The photometric solutions using the Wilson-Devinney code suggest that it is a W-type W UMa system and, interestingly, the system parameters are similar to another contact binary system SW Lac.

关键词： binaries: eclipsing - binaries: close -open clusters: Praesepe

Photometric investigation of eight ultra-short period eclipsing binaries from OGLE

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Research in Astronomy and Astrophysics 2020年第8期20卷 113-120页

作者： shanti priya D. Ravi Raja P. Rukmini J. Raghu Prasad M. Vineet S.Thomas Department of Astronomy Osmania UniversityHyderabad-500007TelanganaIndia The University of Akron AkronOH44325USA

We performed a detailed photometric analysis of eight ultra-short period eclipsing binaries(USPEBs) using the Wilson-Devinney method. We present the modeled light curves and derived photometric solutions. The USPEBs with period(P)≤0.21 d considered in our study belong to W-subtype having shallow contact factor(f)~0.7 and later spectral types. The absolute parameters for these short-period binaries were derived applying empirical relations. We discuss the evolutionary stage of these USPEBs using the mass-radius, color-density and period-color diagrams. The objects showed poor metallicities, and some objects were even found to be existing around fully convective limits. The period distribution of USPEBs exhibited a sharp cut-off at 0.22 d;however, we observed significant deficits for our objects in the literature. We examined the statistics of USPEBs studied to date(in terms of the distribution of period, mass ratio and component temperatures of USPEBs) and observed that a dominant distribution of component temperatures for these USPEBs was towards lower temperatures.

关键词： stars:low-mass stars:evolution stars:low-mass binaries:eclipsing binaries:close