Pulsating Pre-Main Sequence Stars In Young Open Clusters

Details Pulsating Pre-Main Sequence Stars In Young Open Clusters Pulsating Pre-Main Sequence Stars In Young Open Clusters

Aug 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop...70z&link_type=abstract

NOAO Proposal ID #2002B-0070

Physics

Scientific paper

For the search for pre-main sequence (PMS) stars in the young open cluster NGC 6383, 14 nights were granted last year at the CTIO 0.9m telescope. In a preliminary analysis of the data we found ~30% variable stars among the cluster members. We also detected (delta) Scuti like pulsation in a PMS star with an amplitude of ~ 14.8 mmag which could be the 11^th PMS star of which pulsation has been detected. The goal of the project is to determine observationally the boundaries of the PMS instability strip. Only 10 (11 or more by March 2002) pulsating PMS stars are known. This small sample is insufficient for a profound theoretical investigation of the structure of PMS stars using asteroseismic techniques. Additional telescope time is necessary to improve on this situation. We therefore apply for observing time for photometric time series of the open clusters IC 4996 and NGC 6530. Both clusters contain members with spectral types of interest (A-F) which lie between the birthline and the zero-age main sequence (ZAMS). Hence, they are perfect targets for our project.

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