High-speed photometry of AM CVn stars

被引：0

作者：

Woudt, PA ^{[1
]}

Warner, B ^{[1
]}

Patterson, J ^{[1
]}

Espaillat, C ^{[1
]}

机构：

[1] Univ Cape Town, Dept Astron, ZA-7700 Rondebosch, South Africa

来源：

Interacting Binaries: Accretion, Evolution, and Outcomes | 2005年 / 797卷

关键词：

accretion; accretion disks binary stars : cataclysmic variables; QUASI-PERIODIC OSCILLATIONS; DWARF NOVA OSCILLATIONS; FAINT CATACLYSMIC VARIABLES; DOUBLE-DEGENERATE BINARY; CANUM-VENATICORUM; WHITE-DWARF; TELESCOPE OBSERVATIONS; RX J1914.4+2456; ORBITAL PERIOD; X-RAY;

D O I：

暂无

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present high-speed photometry of three AM CVn stars discovered in the last few years (ES Cet, '2003aw' and SDSS J1240). ES Cet has a very stable photometric modulation with a single period of 620.2117 (+/- 0.0002) s (Espaillat et al. 2005) which is identical to its sFectroscopic period. The 2-sigma upper limit on the period derivative (15) of ES Cet is < 1.5 x 10(-11), based on a 3-year observational baseline. Since the discovery of '2003aw' in a supernova search, this AM CVn star has been observed during two outbursts and has a superhump modulation of P-sh = 2041.5 +/- 0.3 s. At quiescence, 2003aw is fairly faint (V similar to 20.4 mag) and no orbital period has yet been derived for this system. Two of the AM CVn stars (V803 Cen and CR Boo) show rapid oscillations similar to the (longer-period) dwarf nova oscillations and quasi-periodic oscillations seen in hydrogen-rich high-M CVs (Warner 2004).

引用

页码：287 / 294

页数：8

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