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1988•Monthly Notices of the Royal Astronomical SocietyOpen access

US 943: a 19th mag eclipsing cataclysmic variable with a period of Formula

Steve B. Howell, K. O. Mason, G. A. Reichert, A. Warnock, T. J. Kreidl

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Abstract

The high-latitude, V∼19.5, blue variable star US 943 is found to be an eclipsing binary with an orbital period of 2.06 hr. The light curve is dominated by an orbital hump which has an amplitude of 0.9 mag in V and is centred about 0.17 orbital cycles before the 1.5-mag deep eclipse. There is evidence that the eclipse has at least two components. The overall appearance of the star is that of a dwarf nova in quiescence, a conclusion that is supported by the observation of a subsequent bright state (V∼15) suggesting a dwarf nova outburst.

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What this paper is about

The high-latitude, V∼19.5, blue variable star US 943 is found to be an eclipsing binary with an orbital period of 2.06 hr. The light curve is dominated by an orbital hump which has an amplitude of 0.9 mag in V and is centred about 0.17 orbital cycles before the 1.5-mag deep eclipse. There is evidence that the eclipse has at least two components. The overall appearance of the star is that of a dwarf nova in quiescence, a conclusion that is supported by the observation of a subsequent bright state (V∼15) suggesting a dwarf nova outburst.

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Available abstract

The high-latitude, V∼19.5, blue variable star US 943 is found to be an eclipsing binary with an orbital period of 2.06 hr. The light curve is dominated by an orbital hump which has an amplitude of 0.9 mag in V and is centred about 0.17 orbital cycles before the 1.5-mag deep eclipse. There is evidence that the eclipse has at least two components. The overall appearance of the star is that of a dwarf nova in quiescence, a conclusion that is supported by the observation of a subsequent bright state (V∼15) suggesting a dwarf nova outburst.

Key concepts: Physics, Eclipse, Cataclysmic variable star, Dwarf nova, Orbital period, Astrophysics, Light curve, Astronomy

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