Interstellar dust clouds in the direction of the globular cluster M 71.

Details Interstellar dust clouds in the direction of the globular cluster M 71. Interstellar dust clouds in the direction of the globular cluster M 71.

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26as..108..581s&link_type=abstract

Astronomy and Astrophysics Suppl. 108, 581-584 (1994)

Astronomy and Astrophysics

Astrophysics

4

Globular Clusters: M 71, Ism: Dust, Extinction

Scientific paper

Two-dimensional classification of 65 stars up to 3.2kpc based on their seven-color CCD photometry in the Vilnius system has been obtained in a field of 7.3x4.5' size in the direction of the globular cluster M 71. In this paper we have used 43 stars up to 2.0kpc. The photometric classification has been performed by an automated method which uses positions of the program stars in special Q-Q, Q-color index or two color diagrams. Errors of spectral type, M_V_ and E(B-V) have been determined using the signal-to-noise ratios for each magnitude of a star. The dependence of E(B-V) on distance shows a dispersion which appears to be significantly larger than the observational errors. Assuming that this scattering is mainly caused by the cloudy structure of interstellar dust, a statistical analysis of the data permits to determine the reddening caused by the single cloud and the frequency of clouds. Our mean E(B-V) and the neutral hydrogen column density from the radio measurements give the gas-to-dust ratio in the direction M 71.

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