Browsing Articles by Subject "Astroseismology"

Browsing Articles by Subject "Astroseismology"

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    The asteroseismic potential of Kepler: first results for solar-type stars 
    Chaplin, W. J.; Appourchaux, T.; Elsworth, Y.; Garcia, R. A.; Houdek, G.; Karoff, C.; Metcalfe, T. S.; Molenda-Zackowicz, J.; Monteiro, M. J. P. F. G.; Thompson, M. J.; Gruberbauer, Michael (American Astronomical Society, 2010-04-20)
    We present preliminary asteroseismic results from Kepler on three G-type stars. The observations, made at one-minute cadence during the first 33.5 d of science operations, reveal high signal-to-noise solar-like oscillation ...

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    Asteroseismology of red giants from the first four months of Kepler data: fundamental stellar parameters 
    Gruberbauer, Michael; Kallinger, T.; Mosser, B.; Hekker, S.; Huber, D.; Stello, D.; Mathur, S.; Basu, S.; Bedding, T. R.; Chaplin, W. J. (EDP Sciences, 2010-10)
    Context. Clear power excess in a frequency range typical for solar-type oscillations in red giants has been detected in more than 1000 stars, which have been observed during the first 138 days of the science operation of ...

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    Bayesian asteroseismology of 23 solar-like Kepler targets 
    Gruberbauer, Michael; Guenther, David B.; MacLeod, K.; Kallinger, T. (Oxford University Press, 2013-10)
    We study 23 previously published Kepler targets to perform a consistent grid-based Bayesian asteroseismic analysis and compare our results to those obtained via the Asteroseismic Modelling Portal. We find differences in ...

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    Bayesian seismology of the Sun 
    Gruberbauer, Michael; Guenther, David B. (Oxford University PressRoyal Astronomical Society, 2013-04-12)
    We perform a Bayesian grid-based analysis of the solar l = 0, 1, 2 and 3 p modes obtained via BiSON in order to deliver the first Bayesian asteroseismic analysis of the solar composition problem. We do not find decisive ...

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    CINDERELLA: comparison of INDEpendent RELative least-squares amplitudes 
    Gruberbauer, Michael; Reegen, P.; Schneider, L.; Weiss, W. W. (EDP Sciences, 2008-06)
    Context. The identification of smaller and smaller signals from objects observed with a non-perfect instrument in a noisy environment poses a challenge for a statistically clean data analysis. Aims. We compute the probability ...

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    [delta] Ceti is not monoperiodic: seismic modeling of a [beta] Cephei star from MOST space-based photometry 
    Guenther, David B.; Aerts, C.; Marchenko, S. V.; Matthews, J. M.; Kuschnig, R.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H.; Weiss, W. W. (American Astronomical Society, 2006-05)
    The [beta] Cephei star [delta] Ceti was considered one of the few monoperiodic variables in its class. Despite (or perhaps because of) its apparently simple oscillation spectrum, it has been challenging and controversial ...

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    Detection of solar-like oscillations, observational constraints, and stellar models for theta Cyg, the brightest star observed by the Kepler Mission 
    Guzik, J. A.; Houdek, G; Chaplin, W. J.; Smalley, B.; Kurtz, W.; Gilliland, R. L.; Mullally, F.; Rowe, J. F.; Bryson, S. T.; Antoci, V.; Gruberbauer, Michael (The American Astronomical Society, 2016-11-01)
    [Theta] Cygni is an F3 spectral type magnitude V=4.48 main-sequence star that was the brightest star observed by the original Kepler spacecraft mission. Short-cadence (58.8 s) photometric data using a custom aperture were ...

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    Kepler observations of rapidly oscillating Ap, [delta] Scuti and [gamma] Doradus pulsations in Ap stars 
    Balona, L. A.; Cunha, M. S.; Kurtz, D. W.; Brandao, I. M.; Gruberbauer, Michael; Saio, H.; Ostensen, R.; Elkin, V. G.; Borucki, W. J.; Christensen-Dalsgaard, J. (Wiley-Blackwell, 2011-01-01)
    Observations of the A5p star KIC 8677585 obtained during the Kepler 10-d commissioning run with 1-min time resolution show that it is a rapidly oscillating Ap (roAp) star with several frequencies with periods near 10 min. ...

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    Modeling convective core overshoot and diffusion in Procyon constrained by asteroseismic data 
    Guenther, David B.; Demarque, P.; Gruberbauer, Michael (IOP Publishing Limited, 2014-06-01)
    We compare evolved stellar models, which match Procyon’s mass and position in the HR diagram, to current groundbased asteroseismic observations. Diffusion of helium and metals along with two conventional core overshoot ...

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    MOST detects SPBe pulsations in HD 127756 and HD 217543: asteroseismic rotation rates independent of v sin i[superscript 1] 
    Guenther, David B.; Cameron, Chris; Saio, H.; Kuschnig, R.; Walker, G. A. H.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W. (American Astronomical Society, 2008-09)
    The MOST (Microvariability and Oscillations of Stars ) satellite has discovered SPBe (slowly pulsating Be) oscillations in the stars HD 127756 (B1/B2 Vne) and HD 217543 (B3 Vpe). For HD 127756, 30 significant frequencies ...

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    MOST observations of the Herbig Ae [delta]-Scuti star HD 34282 
    Guenther, David B.; Casey, M. P.; Zwintz, K.; Weiss, W. W.; Amado, P. J.; Diaz-Fraile, D.; Rodriguez, E.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J. (Royal Astronomical SocietyOxford University Press, 2013-01)
    Microvariability and Oscillations of STars observations and model analysis of the Herbig Ae star HD 34282 (V1366 Ori) reveal [delta] Scuti pulsations. 22 frequencies are observed, 10 of which confirm those previously ...

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    Oscillating red giants in the CoRoT exofield: asteroseismic mass and radius determination 
    Cameron, C.; Gruberbauer, Michael; Kallinger, T.; Weiss, W. W.; Barban, C.; Baudin, F.; Carrier, F.; De Ridder, J.; Goupil, M.-J.; Hatzes, A. (EDP Sciences, 2010-01)
    Context. Observations and analysis of solar-type oscillations in red-giant stars is an emerging aspect of asteroseismic analysis with a number of open questions yet to be explored. Although stochastic oscillations have ...

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    Oscillation mode frequencies of 61 main sequence and subgiant stars observed by Kepler 
    Appourchaux, T.; Chaplin, W. J.; Garcia, R. A.; Gruberbauer, Michael; Verner, G. A.; Antia, H. M.; Benomar, O.; Campante, T. L.; Davies, G. R.; Deheuvels, S. (EDP Sciences, 2012)
    Context. Solar-like oscillations have been observed by Kepler and CoRoT in several solar-type stars, thereby providing a way to probe the stars using asteroseismology. Aims. We provide the mode frequencies of the oscillations ...

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    Oscillation mode linewidths of main-sequence and subgiant stars observed by Kepler 
    Appourchaux, T.; Benomar, O.; Gruberbauer, Michael; Chaplin, W. J.; Garcia, R. A.; Handberg, R.; Verner, G. A.; Antia, H. M.; Campante, T. L.; Davies, G. R. (EDP Sciences, 2012-01)
    Context. Solar-like oscillations have been observed by Kepler and CoRoT in several solar-type stars. Aims. We study the variations in the stellar p-mode linewidth as a function of effective temperature. Methods. We study ...

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    Pulsation analysis of V 588 MON AND V 589 MON observed with the MOST AND CoRoT satellites 
    Zwintz, K.; Kallinger, T.; Guenther, David B.; Gruberbauer, Michael; Kuschnig, R.; Weiss, W. W.; Auvergne, M.; Jorda, L.; Favata, F.; Matthews, J.; Fischer, M. (American Astronomical SocietyIOP Publishing, 2011-03-01)
    The two pulsating pre-main sequence (PMS) stars V 588 Mon and V 589 Mon were observed by CoRoT for 23.4 days in 2008 March during the Short Run SRa01 and in 2004 and 2006 by MOST for a total of ∼70 days. We present their ...

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    Regular frequency patterns in the classical [delta] Scuti star HD 144277 observed by the MOST satellite 
    Zwintz, K.; Lenz, P.; Breger, M.; Pamyatnykh, A. A.; Zdravkov, T.; Kuschnig, R.; Matthews, J. M.; Guenther, David B.; Moffat, A. F. J.; Rowe, J. F. (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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    Solving the mode identification problem in asteroseismology of F stars observed with Kepler 
    White, Timothy R.; Bedding, Timothy R.; Gruberbauer, Michael; Benomar, Othman; Stello, Dennis; Appourchaux, Thierry; Chaplin, William J.; Christensen-Dalsgaard, Jorgen; Elsworth, Yvonne P.; Garcia, Rafael A. (IOP Publishing Limited, 2012-06-01)
    Asteroseismology of F-type stars has been hindered by an ambiguity in identification of their oscillation modes. The regular mode pattern that makes this task trivial in cooler stars is masked by increased line widths. The ...

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    Sounding open clusters: asteroseismic constraints from Kepler on the properties of NGC 6791 and NGC 6819 
    Gruberbauer, Michael; Basu, Sarbani; Grundahl, Frank; Stello, Dennis; Kallinger, T.; Hekker, Saskia; Mosser, Benoit; Garcia, Rafael A.; Mathur, Savita; Brogaard, Karsten (American Astronomical Society, 2011-03-01)
    We present initial results on some of the properties of open clusters NGC 6791 and NGC 6819 derived from asteroseismic data obtained by NASA’s Kepler mission. In addition to estimating the mass, radius, and log g of stars ...

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