Variable Stars in Nearby Galaxies

Details Variable Stars in Nearby Galaxies Variable Stars in Nearby Galaxies

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..237s&link_type=abstract

NOAO Proposal ID #1999A-0237

Physics

Scientific paper

We propose to continue observations for discovering Cepheids in nearby galaxies as part of an ongoing program to obtain distances to 20 galaxies within a nominal distance of 4 Mpc. Such distances are crucial for understanding the morphology, kinematics and dynamics of the Local Group and its environment. It has been shown that Cepheid distances to galaxies out to 7 Mpc can be obtained from the ground when seeing conditions are good. The proposed synoptic observations are ideally suited for the seeing delivered by WIYN, and maximally efficient in queued observing. We also seek to round out the observations for the study of Long Period Variables (LPVs). Our data set, taken over many years, is an ideal basis for such a study, particularly since all our galaxies have or will have Cepheid and/or RR Lyrae distances as well. Our data have identified very large amplitude variables with very long periods (1000 days) that are among the brightest red stars. They are of a type not previously well studied, and we emphasize the need for follow- up observations of such targets.

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