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Browsing by Author "Guenther, David B."
Now showing items 61-80 of 91
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(EDP Sciences, 2005-04)In July, 1999, the Hubble Space Telescope (HST) pointed for more than 8 days continuously at the globular cluster 47 Tucanae. Two guide stars were used during this campaign by the Fine Guidance Sensors (FGS). Using more ...
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(American Astronomical Society, 1999-11-01)A grid of stellar evolution models for Procyon A has been calculated. These models include the best physics available to us (including the latest opacities and equation of state) and are based on the revised astrometric ...
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(American Astronomical Society, 2004-09)We analyze the recent ground-based p-mode oscillation observations of [eta] Boo by Kjeldsen and his collaborators using a large and dense grid of stellar model oscillation spectra parameterized by mass, age, and metallicity. ...
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(EDP Sciences S.A., 2011-09)Context. We present high-precision time-series photometry of the classical δ Scuti star HD 144277 obtained with the MOST (Microvariability and Oscillations of STars) satellite in two consecutive years. The observed ...
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(EDP Sciences, 2013-04)Context. The internal structure of pre-main-sequence (PMS) stars is poorly constrained at present. This could change significantly through high-quality asteroseismological observations of a sample of such stars. Aims. We ...
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(American Astronomical Society, 1995-06-10)We have studied the importance of the combined effects of rotation, diffusion, and convective overshoot on the p-mode oscillation spectrum and the neutrino flux of the standard solar model. To isolate the various physical ...
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(American Astronomical Society, 1999-05-20)Kim and Chan have completed a three-dimensional numerical simulation of the interaction between turbulent convection and radiation in and above the highly superadiabatic layer (SAL) in the Sun. They have shown that the ...
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(American Astronomical Society, 1997-01-10)The effect of adjustments to the superadiabatic layer (SAL) in a model of the Sun on the p-mode oscillation frequencies has been studied. Numerical simulations of solar convection by Kim and coworkers have shown that the ...
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(EDP Sciences, 2009-10)Context. Asteroseismology has great potential for the study of metal-poor stars due to its sensitivity to determine stellar ages. Solid detections of oscillation frequencies in stars with well constrained fundamental ...
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(IOP Publishing Limited, 2012-11-01)The GJ 581 system has been amply studied since its discovery in 2005: the number of known planets in the system has increased and their orbital parameters are among the most precisely determined for radial-velocity-detected ...
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(American Astronomical Society, 1997-08)The structure of the deep interior of a variety of standard and nonstandard solar models constrained by the low-l p-mode oscillation data from GONG are presented. For standard models, we show that the effects of both helium ...
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(American Astronomical Society, 1996-01)The p-mode frequencies recently observed by Kjeldsen and coworkers, along with other observables, are used to determine the mass, age, and helium abundance of [eta] Bootis. We show, by direct application, how the p-model ...
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(American Astronomical Society, 2007-12)Nonradial p-mode oscillation spectra, computed from a dense grid of pre-main-sequence models, are fit to observed oscillation spectra of several stars in the young cluster NGC 6530. The five stars we consider, all previously ...
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(Halifax, N.S. : Saint Mary's University, 1996)The mixing length parameter is a free parameter governing convective energy transport in current stellar models, and is poorly constrained by current photometric observations. Theoretical nonradial pulsation spectra have ...
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(American Astronomical Society, 1996-05-20)The OPAL equation-of-state tables and the MHD equation-of-state tables are utilized in the calculation of new standard solar models that also include helium diffusion. The structure of the models and their l = 0-100 p-mode ...
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(American Astronomical SocietyIOP Publishing, 2011-04-20)We compare the simultaneous 2007 space-based MOST photometry and ground-based radial velocity (RV) observations of the F5 star Procyon. We identify slow variations in the MOST data that are similar to those reported in the ...
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(American Astronomical SocietyIOP PUblishing, 2006-01-10)The space telescope MOST is now providing us with extremely accurate low-frequency p-mode oscillation data for the star [eta] Boo.We demonstrate in this paper that these data, when combined with ground-based measurements ...
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Spectroscopy, MOST photometry, and interferometry of MWC 314: is it an LBV or an interacting binary? (Oxford University Press, 2016)MWC 314 is a bright candidate luminous blue variable (LBV) that resides in a fairly close binary system, with an orbital period of 60.753 [plus or minus] 0.003 d. We observed MWC 314 with a combination of optical spectroscopy, ...
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Stable and unstable accretion in the classical T Tauri stars IM Lup and RU Lup as observed by MOST (Oxford University Press, 2016-03-11)Results of the time variability monitoring of the two classical T Tauri stars, RU Lup and IM Lup, are presented. Three photometric data sets were utilized: (1) simultaneous (same field) MOST satellite observations over ...
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(Oxford University Press, 2014-10-11)We present an analysis of the 2011 photometric observations of TW Hya by the MOST satellite; this is the fourth continuous series of this type. The large-scale light variations are dominated by a strong, quasi-periodic ...
Now showing items 61-80 of 91