A new search technique for M and C stars

Details A new search technique for M and C stars A new search technique for M and C stars

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982aj.....87.1739p&link_type=abstract

Astronomical Journal, vol. 87, Dec. 1982, p. 1739-1750.

Astronomy and Astrophysics

Astronomy

23

Astronomical Photography, Carbon Stars, M Stars, Star Distribution, Stellar Spectrophotometry, Color Photography, Cool Stars, Globular Clusters, Image Filters, Infrared Astronomy, Red Giant Stars

Scientific paper

A method is described for identifying cool stars of types M and C by means of direct photography through narrowband interference filters. The relative magnitudes in filters centered at 7780 and 8120 A reveal the presence of absorption by TiO or CN, respectively, while a third filter at 10,400 A allows the definition of a color index. Photographs of selected globular cluster fields have been taken through the 2-in.-diam filters with an S-1 image tube. Results are presented here for the central region of 47 Tucanae in which 14 new M stars, including five in the range M3-M5, have been found; no carbon stars were found.

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