14 new eclipsing white dwarf plus main-sequence binaries from the SDSS and Catalina surveys

被引：38

作者：

Parsons, S. G. ^{[1
]}

Agurto-Gangas, C. ^{[1
]}

Gaensicke, B. T. ^{[2
]}

Rebassa-Mansergas, A. ^{[3
]}

Schreiber, M. R. ^{[1
,4
]}

Marsh, T. R. ^{[2
]}

Dhillon, V. S. ^{[5
]}

Littlefair, S. P. ^{[5
]}

Drake, A. J. ^{[6
]}

Bours, M. C. P. ^{[2
]}

Breedt, E. ^{[2
]}

Copperwheat, C. M. ^{[7
]}

Hardy, L. K. ^{[5
]}

Buisset, C. ^{[8
]}

Prasit, P. ^{[8
]}

Ren, J. J. ^{[9
]}

机构：

[1] Univ Valparaiso, Dept Fis & Astron, Valparaiso 2360102, Chile

[2] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[3] Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China

[4] Univ Valparaiso, Millenium Nucleus Protoplanetary Disks ALMA Early, Valparaiso 2360102, Chile

[5] Univ Sheffield, Dept Phys & Astron, Sheffield S3 7RH, S Yorkshire, England

[6] CALTECH, Pasadena, CA 91225 USA

[7] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England

[8] Natl Astron Res Inst Thailand, Chiang Mai 50200, Thailand

[9] Peking Univ, Dept Astron, Beijing 100871, Peoples R China

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 449卷 / 02期

基金：

中国国家自然科学基金; 美国国家科学基金会; 英国科学技术设施理事会; 欧洲研究理事会;

关键词：

binaries: close; binaries: eclipsing; stars: low mass; white dwarfs; COMMON-ENVELOPE BINARIES; DIGITAL-SKY-SURVEY; LOW-MASS STARS; DATA RELEASE; MAGNETIC ACTIVITY; NN SERPENTIS; COMPANIONS; RADIUS; QUEST; SPECTROSCOPY;

D O I：

10.1093/mnras/stv382

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the search for neweclipsing white dwarf plusmain-sequence (WDMS) binaries in the light curves of the Catalina surveys. We use a colour-selected list of almost 2000 candidate WDMS systems from the Sloan Digital Sky Survey, specifically designed to identify WDMS systems with cool white dwarfs and/or early M-type main-sequence stars. We identify a total of 17 eclipsing systems, 14 of which are new discoveries. We also find three candidate eclipsing systems, two main-sequence eclipsing binaries and 22 non-eclipsing close binaries. Our newly discovered systems generally have optical fluxes dominated by the main-sequence components, which have earlier spectral types than the majority of previously discovered eclipsing systems. We find a large number of ellipsoidally variable binaries with similar periods, near 4 h, and spectral types M2-3, which are very close to Roche lobe filling. We also find that the fraction of eclipsing systems is lower than found in previous studies and likely reflects a lower close binary fraction among WDMS binaries with early M-type main-sequence stars due to their enhanced angular momentum loss compared to fully convective late M-type stars, hence causing them to become cataclysmic variables quicker and disappear from the WDMS sample. Our systems bring the total number of known detached, eclipsing WDMS binaries to 71.

引用

页码：2194 / 2204

页数：11

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