Browsing by Subject "Stellar oscillations"

Browsing by Subject "Stellar oscillations"

Sort by: Order: Results:

  • Thumbnail
    [alpha] Centauri AB 
    Guenther, David B.; Demarque, P. (American Astronomical Society, 2000-03)
    Detailed models of [alpha] Centauri A and B based on the Hipparcos, Yale, and Soderhjelm parallaxes are compared. The consequences of the uncertainty in mass, luminosity, surface temperature, and composition on the structure ...

  • Thumbnail
    Asteroseismic analysis of the pre-main-sequence stars in NGC 2264 
    Guenther, David B.; Kallinger, T.; Zwintz, K.; Weiss, W. W.; Kuschnig, R.; Casey, M. P.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H. (American Astronomical Society, 2009-10-20)
    NGC 2264 is a young open cluster lying above the Galactic plane in which six variable stars have previously been identified as possible pre-main-sequence (PMS) pulsators. Their oscillation spectra are relatively sparse ...

  • Thumbnail
    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 ...

  • Thumbnail
    Asteroseismology of hybrid pulsators made possible: simultaneous MOST space photometry and ground-based spectroscopy of [gamma] PEG 
    Handler, G.; Matthews, J. M.; Eaton, J. A.; Daszynska-Daszkiewicz, J.; Kuschnig, R.; Lehmann, H.; Rodriguez, E.; Pamyatnykh, A. A.; Zdravkov, T.; Lenz, P.; Guenther, David B. (American Astronomical Society, 2009-06-10)
    We have acquired simultaneous high-precision space photometry and radial velocities of the bright hybrid [beta] Cep/Slowly Pulsating B pulsator [gamma] Peg. Frequency analyses reveal the presence of six gravity (g) modes ...

  • Thumbnail
    Asteroseismology of intermediate mass stars : pre-main sequence evolution 
    Tanner, Joel (Halifax, N.S. : Saint Mary's University, 2007)
    We investigate in detail the potential of asteroseismology in exploring the structure of intermediate mass (1.6 ≤ M⊙ ≤ 5.0) pre-main sequence stars. It is expected that pre- and post-main sequence ...

  • Thumbnail
    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 ...

  • Thumbnail
    Bayesian asteroseismology 
    Gruberbauer, Michael (Halifax, N.S. : Saint Mary's University, 2013)
    This thesis presents a new probabilistic method for the asteroseismic analysis of stellar structure and evolution with the goal of providing a universal tool to improve our knowledge of stellar modelling. This new method ...

  • Thumbnail
    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 ...

  • Thumbnail
    The connection between stellar granulation and oscillation as seen by the Kepler mission 
    Kallinger, T.; De Ridder, J.; Hekker, S.; Mathur, S.; Mosser, B.; Gruberbauer, Michael; Garcia, R. A.; Karoff, C.; Ballot, J. (EDP Sciences, 2014-10)
    Context. The long and almost continuous observations by Kepler show clear evidence of a granulation background signal in a large sample of stars, which is interpreted as the surface manifestation of convection. It has been ...

  • Thumbnail
    [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 ...

  • Thumbnail
    Detection of long-period variations in the subdwarf B star PG 0101+039 on the basis of photometry from the MOST satellite 
    Randall, S. K.; Matthews, J. M.; Fontaine, G.; Rowe, J.; Kuschnig, R.; Green, E. M.; Brassard, P.; Chayer, P.; Guenther, David B.; Moffat, A. F. J. (American Astronomical Society, 2005-11-01)
    We report the detection of three discrete pulsation frequencies in the long-period variable subdwarf B star PG 0101+039 on the basis of ~400 hr of MOST wide-band photometry. The periodicities uncovered lie at 7235, 5227, ...

  • Thumbnail
    Detection of solar-like oscillations in the red giant star [Epsilon] Ophiuchi by MOST spacebased photometry 
    Barban, C.; Matthews, J. M.; De Ridder, J.; Baudin, F.; Kuschnig, R.; Mazumdar, A.; Samadi, R.; Guenther, David B.; Moffat, A. F. J.; Rucinski, S. M. (EDP Sciences, 2007-06)
    Context. Solar-like oscillations have been discovered in a few red giants, including e Oph, through spectroscopy. Acoustic modes around 60 μHz were clearly seen in this star, but daily aliasing of the groundbased data ...

  • Thumbnail
    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 ...

  • Thumbnail
    Discovery of the new slowly pulsating B star HD 163830 (B5 II/III) from MOST space-based photometry 
    Guenther, David B.; Aerts, C.; De Cat, P.; Kuschnig, R.; Matthews, J. M.; Moffat, A. F. J.; Rucinski, S. M.; Sasselov, D.; Walker, G. A. H.; Weiss, W. W. (American Astronomical SocietyIOP Publishing, 2006-05-10)
    We report the discovery of a new slowly pulsating B star, with the largest number of detected frequencies to date by more than a factor of 3, based on 37 days of MOST (Microvariability and Oscillations of STars) satellite ...

  • Thumbnail
    Effects of uniform and differential rotation on stellar pulsations 
    Deupree, Robert G. (Robert Gaston), 1946-; Lovekin, C. C.; Clement, M. J. (American Astronomical SocietyIOP Publishing, 2009-03-01)
    We have investigated the effects of uniform rotation and a specific model for differential rotation on the pulsation frequencies of 10 M[subscript circled dot] stellar models. Uniform rotation decreases the frequencies for ...

  • Thumbnail
    Evolution, structure, and seismology of intermediate-mass stars 
    Guenther, David B. (American Astronomical Society, 2002-04)
    The interior structure, the evolution, and the p-mode oscillation spectra of stellar models between 2.0 and 5 M[subscript circled dot] are presented. Interior details, including convective core and envelope growth and ...

  • Thumbnail
    Evolutionary influences on the structure of red-giant acoustic oscillation spectra from 600d of Kepler observations 
    Guenther, David B.; Gruberbauer, Michael; Kallinger, T.; Hekker, S.; Mosser, B.; De Ridder, J.; Bedding, T. R.; Elsworth, Y. P.; Stello, D.; Basu, S. (EDP Sciences, 2012-05)
    Context. It was recently discovered that the period spacings of mixed pressure/gravity dipole modes in red giants permit a distinction between the otherwise unknown evolutionary stage of these stars. The Kepler space mission ...

  • Thumbnail
    Evolutionary model and oscillation frequencies for [alpha] Ursae Majoris: a comparison with observations 
    Guenther, David B.; Demarque, P.; Buzasi, D.; Catanzarite, J.; Laher, R.; Conrow, T.; Kreidl, T. (American Astronomical Society, 2000-02)
    Inspired by the observations of low-amplitude oscillations of [alpha] Ursae Majoris A by Buzasi et al. using the WIRE satellite, a grid of stellar evolutionary tracks has been constructed to derive physically consistent ...

  • Thumbnail
    Evolutionary models and pulsation analysis of selected MOST and MONS target stars : [Epsilon] Eridani, [Beta] Hydri, and [Beta] Geminorum 
    MacDonald, Peter A. (Halifax, N.S. : Saint Mary's University, 2001)
    Stellar evolution models and their associated non-radial pulsation spectra are presented for the nearby stars [varepsilon] Eridani (K2 V), β Hydri (G2 IV), β Geminorum (K2 III). This analysis was performed in preparation ...

  • Thumbnail
    The first evidence for multiple pulsation axes: a new rapidly oscillating Ap star in the Kepler field, KIC 10195926 
    Gruberbauer, Michael; Kurtz, D. W.; Cunha, M. S.; Saio, H.; Bigot, L.; Balona, L. A.; Elkin, V. G.; Shibahashi, H.; Brandao, I. M.; Uytterhoeven, K. (Royal Astronomical Society, 2011-07-01)
    We have discovered a new rapidly oscillating Ap (roAp) star among the Kepler mission target stars, KIC 10195926. This star shows two pulsation modes with periods that are amongst the longest known for roAp stars at 17.1 ...