Reddening-Free Color-Magnitude Diagrams for Southern Galactic Clusters Containing Cepheids

Details Reddening-Free Color-Magnitude Diagrams for Southern Galactic Clusters Containing Cepheids Reddening-Free Color-Magnitude Diagrams for Southern Galactic Clusters Containing Cepheids

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21442101s&link_type=abstract

American Astronomical Society, AAS Meeting #214, #421.01; Bulletin of the American Astronomical Society, Vol. 41, p.690

Astronomy and Astrophysics

Astronomy

Scientific paper

We are recalibrating the Cepheid Period-Luminosity Relation using Galactic open clusters known to contain one or more classical Cepheids. UBVI data have been obtained for seven southern clusters using the duPont 2.5m telescope at Las Campanas, Chile. For each filter, at least fifteen images were taken consisting of three groups of five exposures, each of 2-8 seconds, 20-80 seconds, and 200-800 seconds. This method gives a large dynamic range over the main sequence (10-12 magnitudes deep), with consistently high signal-to-noise. Preliminary results for the clusters will be presented in the form of standard color-magnitudes plots. These clusters are: NGC 6087, NGC6649, NGC5662, NGC6664, NGC6067, M25, and Lynga 6. In addition, we will introduce a novel method for determining distances using reddening-free W-Q plots, and demonstrate it with its first application to our cluster data.

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