New M stars in the vicinity of dark nebulae. I.

Details New M stars in the vicinity of dark nebulae. I. New M stars in the vicinity of dark nebulae. I.

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997ap.....40..390m&link_type=abstract

Astrophysics, Volume 40, Issue 4, pp.390-400

Astronomy and Astrophysics

Astrophysics

M Stars: Dark Nebulae, M Stars: Detection, M Stars: Spectroscopy, M Stars: Photometry, M Stars: Finding Charts

Scientific paper

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.

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