First Hα and Revised Photometric Studies of Contact Binary KP101231

Devarapalli, Shanti Priya; Rukmini, J.

doi:10.1007/s12036-016-9394-9

Cited by 3 publications

(1 citation statement)

References 15 publications

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“…The chromospheric activity on the binary components can be studied using the spectral line analysis (Barden 1985;Devarapalli & Jagirdar 2016). The normalized spectra of V2840 Cygni with respect to the standard star is as depicted in Figure 3.…”

Section: Spectral Line Analysismentioning

confidence: 99%

The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

POTHUNENI¹,

Devarapalli²,

Rukmini³

2023

Res. Astron. Astrophys.

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The first photometric, spectroscopic, and period variation studies of neglected short-period eclipsing binary V2840 Cygni are presented. High Mass Ratio Contact Binaries, especially those in the weak-contact configuration are vital while probing into the evolutionary models of CBs using stellar parameters. The photometric solutions reveal the weak-contact nature of V2840 Cygni with a high mass ratio ($\sim1.36$), motivating us to investigate the nature of such binaries. The period variation study of V2840 Cygni spanning for 15 years shows a secular period decrease at a rate of \begin{math}\sim5.5\times10^{-7}\end{math}d/yr indicating mass transfer between the components. The superimposed cyclic variation provides a basic understanding of the possible third body (\emph{P$_3$}$\sim8$ yr, \emph{m$_3$}$\sim0.51$M$_\odot$). Following the derived parameters, the evolution of the system is discussed based on Thermal Relaxation Oscillation (TRO) model. It is found that V2840 Cygni falls in a special category of HMRCBs, that validates TRO. To characterise the nature of HMRCBs, a catalog of 114 CBs with high mass ratios has been compiled along with their derived parameters from the literature. For all the HMRCBs in the study, a possible correlation between their contact configuration and observed period variations for relative log\emph{J$_{rel}$} is discussed. The 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 study. The LAMOST spectra of 30 HMRCBs are collected to interpret the stellar magnetic activity in such systems.

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Section: Spectral Line Analysismentioning

confidence: 99%

The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

POTHUNENI¹,

Devarapalli²,

Rukmini³

2023

Res. Astron. Astrophys.

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First investigations of 14 neglected, late-type contact binaries

Jagirdar,

Devarapalli

2023

Astrophys Space Sci

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Comprehensive study of a neglected contact binary TYC 5532-1333-1

Devarapalli

Rukmini

Prasad

et al. 2020

Monthly Notices of the Royal Astronomical Society

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A comprehensive photometric and spectroscopic analysis of the variable TYC 5532-1333-1 (TYC) along with an investigation of its orbital period variation is presented for the first time. The B- and V-band photometric study indicates that TYC is an intermediate contact binary with degree of contact and mass ratio of 34 per cent and ∼0.24, respectively. The derived equivalent widths from the spectroscopic study of Hα and Na-I lines reveal phase-dependent variation and mutual correlation. Using the available times of minimum light, an investigation of orbital period variation shows a long-term decrease at a rate of 3.98 × 10 −6 d yr−1. Expected causes for such decline in the orbital period could be angular momentum loss and a quasi-sinusoidal variation due to light-time effect probably caused by a third-body companion. The minimum mass of the third body (M3) was derived to be $0.65 \, \mathrm{M}_{\odot }$. Our presented study is an attempt to evaluate and understand the evolutionary state of above-mentioned neglected contact binary.

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First Hα and Revised Photometric Studies of Contact Binary KP101231

Cited by 3 publications

References 15 publications

The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

The First Photometric and Spectroscopic Study of Contact Binary V2840 Cygni

First investigations of 14 neglected, late-type contact binaries

Comprehensive study of a neglected contact binary TYC 5532-1333-1

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