Browsing Articles by Subject "Red giants"

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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 ...
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 ...
NLTE AND LTE Lick indices for red giants from [Fe/H] 0.0 TO −6.0 AT SDSS AND IDS spectral resolution

Short, C. Ian (Christopher Ian), 1965-; Young, Mitchell E.; Layden, Nicholas (American Astronomical Society, 2015-09-01)

We investigate the dependence of the complete system of 22 Lick indices on overall metallicity scaled from solar abundances, [M/H], from the solar value, 0.0, down to the extremely metal-poor (XMP) value of −6.0, for ...
Non-local thermodynamic equilibrium 1.5D modeling of red giant stars

Young, Mitchell E.; Short, C. Ian (Christopher Ian), 1965- (IOP Publishing, 2014-05-20)

Spectra for two-dimensional (2D) stars in the 1.5D approximation are created from synthetic spectra of one-dimensional (1D) non-local thermodynamic equilibrium (NLTE) spherical model atmospheres produced by the PHOENIX ...
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 ...
Solar-like oscillations in low-luminosity red giants: first results from Kepler

Gruberbauer, Michael; Bedding, T. R.; Huber, D.; Stello, D.; Elsworth, Y. P.; Hekker, S.; Kallinger, T.; Mathur, S.; Mosser, B.; Preston, H. L. (American Astronomical Society, 2010-04-20)

We have measured solar-like oscillations in red giants using time-series photometry from the first 34 days of science operations of the Kepler Mission. The light curves, obtained with 30 minute sampling, reveal clear ...