Spectral Classification of "Photometric Subgiants" in Open Clusters

Details Spectral Classification of "Photometric Subgiants" in Open Clusters Spectral Classification of "Photometric Subgiants" in Open Clusters

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1039s&link_type=abstract

Astronomical Journal v.113, p. 1039-1044 (1997)

Astronomy and Astrophysics

Astronomy

4

Scientific paper

Color-magnitude diagrams of several intermediate-age open clusters contain apparent post-main-sequence stars which are fainter than predicted by standard evolutionary tracks. We have obtained classification spectra for such stars in eight clusters. Some of these are reddened background early-type stars, and several of the late-type stars turn out to have luminosities indicative of being foreground to the cluster. A few stars appear to be cluster members but do not fit the theoretical tracks. We find that the Bahcall-Soneira Galaxy model, modified for low galactic latitudes, can give statistically useful predictions of the numbers of field stars.

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