Preliminary results from the STEPHI2009 campaign on the open cluster NGC 1817 - Astrophysics > Solar and Stellar AstrophysicsReport as inadecuate




Preliminary results from the STEPHI2009 campaign on the open cluster NGC 1817 - Astrophysics > Solar and Stellar Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present preliminary observational results of the multi-site STEPHIcampaign on the cluster NGC 1817. The three observatories involved are SanPedro Martir Mexico, Xing Long China and the Observatorio del Teide Spain- giving an ideal combination to maximise the duty cycle. The cluster has 12known delta Scuti stars and at least two detached eclipsing binary systems.This combination of characteristics is ideal for extracting information aboutglobal parameters of the targets, which will in turn impose strict constraintson the stellar models. From an initial comparison with stellar models using theknown fundamental parameters, and just the observed pulsation frequencies andmeasured effective temperatures, it appears that a lower value of initialhelium mass fraction will most likely explain the observations of these stars.



Author: O.L. Creevey, J.N. Fu, L. Fox Machado, M. Alvarez, J.A. Belmonte, A. Gyorffy, E. Michel, R. Michel, H. Parvianinen, J.H. Pena, W.

Source: https://arxiv.org/



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