Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983japa....4..235b&link_type=abstract
Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 4, Dec. 1983, p. 235-252.
Astronomy and Astrophysics
Astronomy
7
Hertzsprung-Russell Diagram, Milky Way Galaxy, Open Clusters, Gratings (Spectra), Sky Surveys (Astronomy), Stellar Spectra
Scientific paper
Low-dispersion spectra of the order of 1000 A/mm have been obtained for stars in several faint galactic clusters with a transmission grating placed in front of the photographic plate at the Cassegrain focus of the Kavalur 102-cm telescope. The intensity distribution in the shorter wavelengths has been taken as the principal criterion for the spectral classification of the individual stars in the area covered by the photographic plate. The uncertainty in this procedure has been found to be about two spectral subclasses. A combination of these spectral classes with the visual magnitudes derived from the image diameters on the Palomar Observatory Sky Survey charts provide the HR diagrams for each cluster area. These diagrams are adequate to establish the cluster membership of any star to a first approximation. This technique has been tested on six galactic open clusters. Good agreement both in terms of the ages of the clusters and individual stellar membership is found.
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