RADIUS CONSTRAINTS FROM HIGH-SPEED PHOTOMETRY OF 20 LOW-MASS WHITE DWARF BINARIES

被引：36

作者：

Hermes, J. J. ^{[1
,2
]}

Brown, Warren R. ^{[3
]}

Kilic, Mukremin ^{[4
]}

Gianninas, A. ^{[4
]}

Chote, Paul ^{[5
]}

Sullivan, D. J. ^{[5
]}

Winget, D. E. ^{[2
]}

Bell, Keaton J. ^{[2
]}

Falcon, R. E. ^{[2
]}

Winget, K. I. ^{[2
]}

Mason, Paul A. ^{[6
]}

Harrold, Samuel T. ^{[2
]}

Montgomery, M. H. ^{[2
]}

机构：

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

[2] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[3] Smithsonian Astrophys Observ, Cambridge, MA 02138 USA

[4] Univ Oklahoma, Homer L Dodge Dept Phys & Astron, Norman, OK 73019 USA

[5] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6140, New Zealand

[6] Univ Texas El Paso, Dept Phys, El Paso, TX 79968 USA

来源：

ASTROPHYSICAL JOURNAL | 2014年 / 792卷 / 01期

基金：

美国国家科学基金会; 欧洲研究理事会;

关键词：

binaries: close; Galaxy: stellar content; stars: variables: general; white dwarfs; INITIAL MASS; NLTT; 11748; KEPLER OBSERVATIONS; ECLIPSING BINARY; MERGER SYSTEMS; METAL-RICH; HELIUM; EVOLUTION; STARS; COMPANION;

D O I：

10.1088/0004-637X/792/1/39

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We carry out high-speed photometry on 20 of the shortest-period, detached white dwarf binaries known and discover systems with eclipses, ellipsoidal variations (due to tidal deformations of the visible white dwarf), and Doppler beaming. All of the binaries contain low-mass white dwarfs with orbital periods of less than four hr. Our observations identify the first eight tidally distorted white dwarfs, four of which are reported for the first time here. We use these observations to place empirical constraints on the mass-radius relationship for extremely low-mass (<= 0.30 M-circle dot) white dwarfs. We also detect Doppler beaming in several of these binaries, which confirms their high-amplitude radial-velocity variability. All of these systems are strong sources of gravitational radiation, and long-term monitoring of those that display ellipsoidal variations can be used to detect spin-up of the tidal bulge due to orbital decay.

引用

页数：12

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