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

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

作者： Shanti Priya D. Ravi Raj. 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 obj.cts showed poor metallicities, and some obj.cts 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 obj.cts 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

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The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

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Research in Astronomy and Astrophysics 2023年第2期23卷 205-222页

作者： Ravi Raj. Pothuneni Shanti Priya Devarapalli rukmini j.girdar Department of Astronomy Osmania University500007India

The first photometric,spectroscopic and period variation studies of neglected short-period eclipsing binary V2840Cygni are *** mass ratio contact binaries(HMRCBs),especially those in the weak-contact configuration,are vital when probing the evolutionary models of contact binaries(CBs) using stellar *** photometric solutions reveal the weak-contact nature of V2840 Cygni with a high mass ratio(~1.36),motivating us to investigate the nature of such *** period variation study of V2840 Cygni spanning 15 yr shows a secular period decrease at a rate of ~5.5 × 10^(-7) day yr^(-1),indicating mass transfer between the *** superimposed cyclic variation provides a basic understanding of the possible third body(P_(3)- 8 yr,m_(3)- 0.51 M_(⊙)).Following the derived parameters,the evolution of the system is discussed based on the thermal relaxation oscillation(TRO) *** is found that V2840 Cygni falls in a special category of HMRCBs,which validates *** characterize the nature of HMRCBs,a catalog of 59 CBs with high mass ratios has been compiled along with their derived parameters from the *** all the HMRCBs in the study,a possible correlation between their contact configuration and observed period variations for relative log j.(rel) is *** spectroscopic study of V2840 Cygni provides evidence of the presence of magnetic activity in the system and the existence of ongoing mass transfer which is additionally deduced from the period variation *** LAMOST spectra of 17 HMRCBs are collected to interpret the stellar magnetic activity in such systems.

关键词： (stars:)binaries eclipsing-(stars:)binaries(including multiple) close-stars evolution-techniques photometric-techniques spectroscopic-stars activity

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