منابع مشابه
Photometric Modal Discrimination in Δ Scuti and Γ Doradus Stars
Abstract. The potential of photometric methods for the identification of l, the degree of spherical surface harmonic of a pulsating star, is investigated with special emphasis on Strömgren photometry applied to δ Scuti and γ Dor variables. Limitations of actual model atmospheres when fine precision is required for the calculations of partial derivatives and integrals, which depend on limb darke...
متن کاملγ Doradus Stars: Defining a New Class of Pulsating Variables
In this paper we describe a new class of pulsating stars, the prototype of which is the bright, early, F-type dwarf, γ Doradus. These stars typically have between 1 and 5 periods ranging from 0.4 to 3 days with photometric amplitudes up to 0. 1 in Johnson V . The mechanism for these observed variations is high-order, low-degree, non-radial, gravity-mode pulsation. Subject headings: Stars: varia...
متن کاملFrequency ratio method for seismic modeling of γ Doradus stars
A method for obtaining asteroseismological information of a γ Doradus oscillating star showing at least three pulsation frequencies is presented. This method is based on a first-order asymptotic g-mode expression, in agreement with the internal structure of γ Doradus stars. The information obtained is twofold: 1) a possible identification of the radial order n and degree l of observed frequenci...
متن کاملThe Frequency Ratio Method for seismic modelling of γ Doradus stars II . The role of rotation
The effect of rotation on the Frequency Ratio Method (Moya et al. 2005) is examined. Its applicability to observed frequencies of rotating γ Doradus stars is discussed taking into account the following aspects: the use of a perturbative approach to compute adiabatic oscillation frequencies; the effect of rotation on the observational Brunt–Väisälä integral determination and finally, the problem...
متن کاملA Γ Doradus Star Campaign
We report on the results from a large photometric campaign on thirty five γDor star candidates undertaken at the Institute of Astronomy of the University of Leuven in the framework of the Flanders – South-Africa grant. An overview of the data, as well as the results of the analysis of the obtained time series are presented, the main conclusion being that nine stars are thought to be multiperiod...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2016
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stw1038