Pulsating Pre-Main Sequence Stars In Young Open Clusters

Author(s)

Konstanze Zwintz, Werner W. Weiss, Thomas Kallinger

Abstract

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.

Organisation(s)

Department of Astrophysics

Journal

NOAO Proposal ID 2002B-0070

Publication date

08-2002

Peer reviewed

Yes

Austrian Fields of Science 2012

103004 Astrophysics

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