Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2010-04-14
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
4 pages, proceedings from HELAS IV meeting 2010, Lanzarote
Scientific paper
We present preliminary observational results of the multi-site STEPHI campaign on the cluster NGC 1817. The three observatories involved are San Pedro Martir (Mexico), Xing Long (China) and the Observatorio del Teide (Spain) - giving an ideal combination to maximise the duty cycle. The cluster has 12 known delta Scuti stars and at least two detached eclipsing binary systems. This combination of characteristics is ideal for extracting information about global parameters of the targets, which will in turn impose strict constraints on the stellar models. From an initial comparison with stellar models using the known fundamental parameters, and just the observed pulsation frequencies and measured effective temperatures, it appears that a lower value of initial helium mass fraction will most likely explain the observations of these stars.
Alvarez Marcelo
Belmonte Juan Antonio
Creevey Orlagh L.
Fu Jian-Ning
Gyorffy A.
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