Spectral types of four binaries based on photometric observations |
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| Authors: | V V Shimanskii I F Bikmaev N V Borisov V V Vlasyuk A I Galeev N A Sakhibullin O I Spiridonova |
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| Institution: | (1) Kazan State University, Kazan, Russia;(2) Special Astrophysical Observatory, Russian Academy of Sciences, Karachai-Cherkessian Republic, Nizhnii Arkhyz, Russia |
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| Abstract: | We present results of photometric and spectroscopic observations of four close binaries with subdwarf B components: PG 0918+029, PG 1000+408, PG 1116+301, PG 0001+275. We discovered that PG 1000+408 is a close binary, with the most probable orbital period being P orb = 1.041145 day. Based on a comparison of the observed light curves at selected orbital phases and theoretical predictions for their variations, all the systems are classified as doubly degenerate binaries with low-luminosity white-dwarf secondaries. |
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