Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasp..117..601a&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 117, Issue 832, pp. 601-614.
Astronomy and Astrophysics
Astronomy
14
Stars: Individual (Δ Scuti), Stars: Oscillations, Open Clusters And Associations: Individual (Ngc 1817)
Scientific paper
We obtained high-precision time-series observations of stars in the open cluster NGC 1817 in order to find δ Scuti stars among the cluster members. The detection of 12 δ Scuti stars, of which our data suggest that 11 are cluster members, makes NGC 1817 a key target for asteroseismology of 1.5-2.5 Msolar stars. One of the cluster member δ Scuti stars is also an eclipsing binary, potentially offering very strong constraints for theoretical modeling. In addition, we find one δ Scuti star candidate, a γ Dor candidate, two variables of currently unknown type, and two eclipsing binary systems. We also describe a method for combining the oscillation frequencies of several δ Scuti stars in a single cluster to obtain information about the order n of the excited modes. This method will eventually be used to constrain the theoretical models to be compared with precise oscillation frequencies determined from a future multisite campaign (asteroseismology).
Arentoft Torben
Bouzid M. Y.
Frandsen Soeren
Freyhammer Lars Michael
Sterken Christiaan
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