Physics
Scientific paper
Feb 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..224z&link_type=abstract
NOAO Proposal ID #2007A-0224
Physics
Scientific paper
The discovery of pulsating pre-main sequence (PMS) stars, e.g. in young open clusters, has recently triggered the development of non- radial pulsation theory for such young stars, hence, increasing dramatically the eigenfrequency spectrum accessible for an asteroseismic analysis. Inaccurate stellar models and observed frequencies usually provide unsatisfying results. This problem can be alleviated by confining temperatures and luminosities using spectroscopic measurements. As pulsating PMS stars in young clusters are generally quite faint, for only few of them spectral classes, temperatures and luminosities are available. Hence, we propose to obtain classification spectra with S/N ≥ 100 for the known pulsating cluster members and candidates in NGC 6383, NGC 6530 and NGC 6611 using the R-C spectrograph at the CTIO 1.5m telescope. This program will allow us to determine the position of the previously discovered variable stars in the HR diagram, to investigate their cluster membership and to obtain the indispensable input for their asteroseismic analysis.
Nesvacil Nicole
Pollack Susanne
Weiss Werner W.
Zwintz Konstanze
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