Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems

  title={Extremely Low Mass Ratio Contact Binaries. I. The First Photometric and Spectroscopic Investigations of Ten Systems},
  author={Kai Li and Xiang Gao and Xin-Yi Liu and Xing Gao and Ling Li and Xinfa Chen and Guoyou Sun},
  journal={The Astronomical Journal},
The photometric and spectroscopic investigations of ten contact binaries were presented for the first time. It is discovered that the mass ratios of all the ten targets are smaller than 0.15, they are extremely low mass ratio contact binaries. Seven of them are deep contact binaries, two are medium contact binaries, while only one is a shallow contact system. Five of them show the O’Connell effect, and a dark spot on one of the two components can lead to a good fit of the asymmetric light… 



Contact binaries at the short period cut-off – I. Statistics and the first photometric investigations of 10 totally eclipsing systems

  • Kai LiQ. Xia D. Gao
  • Physics
    Monthly Notices of the Royal Astronomical Society
  • 2019
The period distribution of contact binaries exhibits a very sharp short period cut-off at 0.22 days. In order to provide valuable information on this short period limit, we observed ten totally

Photometric Study and Absolute Parameter Estimation of Six Totally Eclipsing Contact Binaries

High precision CCD observations of six totally eclipsing contact binaries were presented and analyzed. It is found that only one target is an A-type contact binary (V429 Cam), while the others are

The first photometric and spectroscopic analysis of the extremely low mass-ratio contact binary NSVS 5029961

We performed photometric and spectroscopic investigations of NSVS 5029961 for the first time. The new BV(RI)c-band light curves were obtained with the 1.0-m telescope at Weihai Observatory of

The First Light Curve Modeling and Orbital Period Change Investigation of Nine Contact Binaries around the Short-period Cutoff

In this paper, we present the first light curve synthesis and orbital period change analysis of nine contact binaries around the short-period limit. It is found that all these systems are W-subtype


A sample of 46 deep, low mass ratio (DLMR) overcontact binaries (i.e., q ≤ 0.25 ?> and f ≥ 50 % ?> ) is statistically analyzed in this paper. It is found that five relations possibly exist among some

Two W-subtype contact binaries: GQ Boo and V1367 Tau

Two contact binaries, GQ Boo and V1367 Tau, were observed and analysed with a new method to obtain the absolute parameters. The light-curve analysis shows that both of them are obvious W-subtype

A Single-lined Spectroscopic Binary Companion to an Active and Deep Contact Binary in a Quintuple Stellar System

V410 Aur is a known deep and low-mass-ratio contact binary with a spectroscopically tertiary component and a visual companion. However, the physical and orbital properties of the tertiary are

The Photometric Amplitude and Mass Ratio Distributions of Contact Binary Stars

The distribution of the light variation amplitudes A(a), in addition to determining the number of undiscovered contact binary systems falling below photometric detection thresholds and thus lost to

Two Contact Binaries with Mass Ratios Close to the Minimum Mass Ratio

The cutoff mass ratio is under debate for contact binaries. In this paper, we present the investigation of two contact binaries with mass ratios close to the low mass ratio limit. It is found that

On the origin of W UMa type contact binaries – a new method for computation of initial masses

W UMa type binaries have two defining characteristics. These are (i) the effective temperatures of both components are very similar, and (ii) the secondary (currently less massive) component is