New m stars in the vicinity of dark nebulae. I |
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| Authors: | N D Melikian A A Karapetian |
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| Institution: | (1) Byurakan Astrophysical Observatory, Armenia |
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| Abstract: | The results of a spectroscopic survey of late-type M stars in three regions of dark nebulae are given. The observations were
made on the 1-m Schmidt telescope of Byurakan Observatory with a 4° preobjective prism. A method of detecting late-type M
giants is developed on the basis of the presence of TiO absorption bands in their spectra. The area of the regions studied
is 48 sq. deg. We found 96 new late-type M stars, 22 of which exhibited brightness variability during our observations and
are new variable stars. The limiting magnitude on the plates obtained in red light is 16m.0, which enables us to state confidently that all late-type M stars (starting with M4) brighter than R = 15m.0 have been detected.
Translated from Astrofizika, Vol. 40, No. 4, pp. 595–607, October-December, 1997. |
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