A method for estimating masses ofWUrsaeMajoris-type binaries

Lu, Lina; Liu, Jinzhong; Jiang, Dengkai; Wang, Yahui

doi:10.1088/1674-4527/20/12/196

Cited by 4 publications

(2 citation statements)

References 103 publications

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“…Sun et al (2020) used 𝛼 = 4.216 (Yildiz & Doğan 2013) to infer the mass of the primary. Lu et al (2020) suggested a method that combined the PARSEC code (PAdova and TRieste Stellar Evolution Code; Bressan et al 2012) with the Roche geometric model to determine the masses of EWs. They applied their method on a sample of 140 spectroscopic studied binaries, and found it to be efficient in high-mass ratio and short-period systems with low effective temperatures.…”

Section: Absolute Parametersmentioning

confidence: 99%

New low mass ratio contact binaries in the Catalina Sky Survey

Christopoulou,

Lalounta,

Papageorgiou

et al. 2022

Preprint

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We present the identification and photometric analysis of 30 new low mass ratio (LMR) totally eclipsing contact binaries found in Catalina Sky Survey data. The LMR candidates are identified using Fourier coefficients and visual inspection. We perform a detailed scan in the parameter plane of mass-ratio (𝑞) versus inclination (𝑖) using Phoebe-0.31 scripter to derive the best (𝑞, 𝑖) pair for the initial models. The relative physical parameters are determined from the final model of each system. A Monte-Carlo approach was adopted to derive the parameter errors. The resulting parameters confirm the identification. The approximate absolute physical parameters of the systems are estimated based on the light curve solutions and Gaia early Data Release 3 distances. Twelve out of 30 new systems have fill-out factors 𝑓 > 50% and 𝑞 ≤ 0.25 (deep contact LMR systems), and 8 of them, to within errors, are extreme LMR deep systems with 𝑞 ≤ 0.1. We discuss the evolutionary status of the 30 LMR systems in comparison with the most updated catalog of LMR systems from the literature. The scenario of the LMR systems as pre-merger candidates forming fast rotating stars is investigated for all systems, new and old, based both on Hut's stability criteria and critical instability mass ratio (𝑞 inst ) relation. CSS_J075848.2+125656, with 𝑞/𝑞 inst = 1.23 ± 0.23, and CSS_J093010.1-021624, with 𝑞/𝑞 inst = 1.25 ± 0.23, can be considered as merger candidates.

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Section: Absolute Parametersmentioning

confidence: 99%

New low mass ratio contact binaries in the Catalina Sky Survey

Christopoulou,

Lalounta,

Papageorgiou

et al. 2022

Preprint

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“…According to the definition introduced by Binnendijk (1970), late-type (or W UMa-type) contact binaries (CBs) are classified into two classes: A type and W type. We use "subtype" instead of "type," as some new literature has used (Li et al 2020;Lu et al 2020;Qian et al 2020;Alton & Stepień 2021;Li et al 2021;Panchal & Joshi 2021). For A-subtype contact systems, the more massive component has a higher effective temperature compared to the less massive component, while for W-subtype systems, the less massive component has the higher temperature (Yildiz & Doğan 2013;Li et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of TESS Photometry and Radial Velocities on Six Early K-type Contact Binaries with Similar Periods around 0.268 Day

Liu

Qian

Liao

et al. 2023

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High-precision light curves were extracted from TESScut images. Together with APOGEE and LAMOST medium-resolution spectra, a joint study was made for six early K-type contact binary candidates selected unbiasedly with orbital periods around 0.268 day. It is found that all of them (RV CVn, EK Com, V384 Ser, V1038 Her, EH CVn, and CSS_J125403.7+503945) are W-subtype shallow contact systems, though with different mass ratios (1/q = 0.27–0.62). The effective temperature differences between the binary components are around a few hundred kelvins. The original definitions of the A and W subtypes were compared with the customarily used methods, which rely on the shape or photometric solutions of the light curves. The latter two methods are not always reliable; therefore, the radial velocity analysis is strongly recommended. Through a collection of all available K-type contact binaries with both photometric and spectroscopic measurements, it is found that almost all of them are W-subtype systems, except for a few objects that have nearly identical temperatures for binary components. This W-subtype phenomenon for K-type contact binaries should be further checked with more samples in the future. Finally, the physical parameters of the targets were determined with joint data analysis, and the multiplicity is discussed for these targets. Objects V384 Ser and RV CVn are confirmed to very likely be triple systems from comprehensive analysis, while V1038 Her is a candidate of a triple system based on photometric and spectroscopic solutions.

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A Photometric Study of Two Contact Binaries: CRTS J025408.1+265957 and CRTS J012111.1+272933

Ma¹,

Liu²,

Zhang³

et al. 2022

Res. Astron. Astrophys.

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We performed new photometric observations for two contact binaries (i.e., CRTS J025408.1+265957 and CRTS J012111.1+272933), which were observed by the 1.0-m telescope at Xingjiang Astronomical Observatory. From our light curves and several survey data, we derived several sets of photometric solutions. We found that CRTS J025408.1+265957 and CRTS J012111.1+272933 were A- and W-type W UMa, respectively. The results imply that the spot migrates or disappears in two contact binaries, which were identified by chromospheric activity emissions (e.g. Hα emission) from LAMOST spectra. From the O-C curves, the orbital periods of two contact binaries may be increasing, which is interpreted by the mass transfer from the less massive component to the more massive one. With mass transferring, two contact binaries may evolve from the contact configurations to semi-detected ones as predicted by the theory of thermal relaxation oscillation.

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A method for estimating masses ofWUrsaeMajoris-type binaries

Cited by 4 publications

References 103 publications

New low mass ratio contact binaries in the Catalina Sky Survey

New low mass ratio contact binaries in the Catalina Sky Survey

Comparative Study of TESS Photometry and Radial Velocities on Six Early K-type Contact Binaries with Similar Periods around 0.268 Day

A Photometric Study of Two Contact Binaries: CRTS J025408.1+265957 and CRTS J012111.1+272933

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