منابع مشابه
γ 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 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...
متن کاملLine profile variations in γ Doradus
We present data from high-dispersion echelle spectra and simultaneous uvby photometry for γ Doradus. These data were obtained from several sites during 1994 November as part of the MUSICOS-94 campaign. The star has two closely-spaced periods of about 0.75 d and is the brightest member of a new class of variable early F-type stars. A previously suspected third period, very close to the other two...
متن کاملSMEI observations of previously unseen pulsation frequencies in γ Doradus
Aims. As g-mode pulsators, gamma-Doradus-class stars may naı̈vely be expected to show a large number of modes. Taking advantage of the long photometric time-series generated by the Solar Mass Ejection Imager (SMEI) instrument, we have studied the star gamma Doradus to determine whether any other modes than the three already known are present at observable amplitude. Methods. High-precision photo...
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...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2020
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/staa2905