2 UNUSUAL CATACLYSMIC VARIABLES AT HIGH GALACTIC LATITUDE - CP ERIDANI AND AL COMAE

被引：44

作者：

ABBOTT, TMC ^{[1
]}

ROBINSON, EL ^{[1
]}

HILL, GJ ^{[1
]}

HASWELL, CA ^{[1
]}

机构：

[1] UNIV TEXAS,DEPT ASTRON,AUSTIN,TX 78712

来源：

ASTROPHYSICAL JOURNAL | 1992年 / 399卷 / 02期

关键词：

BINARIES; CLOSE; NOVAE; CATACLYSMIC VARIABLES; STARS; INDIVIDUAL (CP ERDANI; AL COMAE); WHITE DWARFS;

D O I：

10.1086/171960

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present time-series photometry of two faint, interacting binary stars at high Galactic latitude: CP Eridani and AL Comae Berenices. We also present spectroscopy of CP Eri. CP Eri has a long-lived photometric periodicity near 28 minutes. Its spectrum has lines of helium that are sometimes in emission and sometimes in absorption; there are no lines of hydrogen in the spectrum. We identify CP Eri as a binary star consisting of a pair of white dwarfs undergoing mass transfer. AL Com has an unstable, high-amplitude photometric modulation with a period between 87 and 90 minutes. The previously identified photometric period at 41 minutes is also unstable. Some of the properties of AL Com are similar to the dwarf nova WZ Sge and others are similar to the intermediate polar EX Hya, but overall AL Com is unlike any other well-studied cataclysmic variable.

引用

页码：680 / 685

页数：6

共 28 条

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Abbott T. M. C., 1988, Instrumentation for Ground-Based Optical Astronomy Present and Future. The Ninth Santa Cruz Summer Workshop in Astronomy and Astrophysics, P386

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