Other
Scientific paper
Feb 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000noao.prop...15h&link_type=abstract
NOAO Proposal ID #2000A-0015
Other
Scientific paper
Open clusters play important roles as natural laboratories containing uniform populations of coevolving stars and as tracers of Galactic structure and star formation. To date, the most comprehensive color-magnitude diagram (CMD) of the rich open cluster NGC 3532 reaches only V=13.5 and contains just 700 stars - modern CCD observations of NGC 3532 are lacking. We will observe NGC 3532 with the CTIO 0.9-m in order to: (1) Obtain CMDs in multiple colors with limiting magnitude V=19 to provide the first complete census of its stellar population and allow us to more accurately derive its distance and other properties. (2) Obtain multiple epoch V images to identify stellar variability on timescales of ≲1 day to several months. The presence of eclipsing binaries in NGC 3532 would provide another means of determining the cluster distance. Several independent distance measurements to NGC 3532 exist, so this will also provide a means of verifying the accuracy of the eclipsing binary distance method, which is now used to determine distances to the Magellanic Clouds and, hence, calibrate the crucial first rung of the cosmic distance scale.
Hoard Donald Wayne
Landolt Arlo U.
Wachter Stefanie
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