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Distant Milky Way M Giants（图）
The Milky Way. Stars Distant Astrophysics. The telescope. Red dwarfs galaxy
2014/7/18
The distant outskirts of the Milky Way harbor valuable clues for understanding the formation and evolution of our Galaxy. Yet, due to overwhelming distances and an extremely sparse population of star...
The metallicity distribution of bulge clump giants in Baade's Window
Galaxy: bulge – Galaxy: formation – Galaxy: abundances – Stars: abundances – Stars: atmosphere
2011/10/20
We seek to constrain the formation of the Galactic bulge by means of analysing the detailed chemical composition of a large sample of red clump stars in Baade's window. We measure [Fe/H] in a sample o...
Identification of field dwarfs and giants in RAVE
surveys–catalogues–techniques: photometric
2011/10/13
The second RAdial Velocity Experiment (RAVE) Data Release (DR2) derives log g values but we present a simpler and cleaner method of identifying dwarfs and giants using only magnitudes, which does not ...
An asteroseismic membership study of the red giants in three open clusters observed by Kepler: NGC6791, NGC6819, and NGC6811
asteroseismic membership study red giants clusters observed Kepler
2011/9/29
Studying star clusters offers significant advances in stellar astrophysics due to the combined power of having many stars with essentially the same distance, age, and initial composition. This makes c...
Amplitudes of solar-like oscillations: constraints from red giants in open clusters observed by Kepler
Amplitudes solar-like oscillations: constraints clusters observed Kepler
2011/9/27
Scaling relations that link asteroseismic quantities to global stellar properties are important for gaining understanding of the intricate physics that underpins stellar pulsation. The common notion t...
Thermohaline Mixing: Does It Really Govern the Atmospheric Chemical Composition of Low-Mass Red Giants?
stars abundances — stars evolution — stars interiors
2010/11/12
First results of our 3D numerical simulations of thermohaline convection driven by 3He burning in a low-mass RGB star at the bump luminosity are presented. They confirm our previous conclusion that th...
Asteroseismology of red giants from the first four months of Kepler data: Fundamental parameters
red giants from Kepler data Fundamental parameters
2011/1/10
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 o...
Asteroseismology of red giants from the first four months of Kepler data: Global oscillation parameters for 800 stars
Asteroseismology red giants the first four months
2011/1/10
We have studied solar-like oscillations in ~800 red-giant stars using Kepler long-cadence photometry. The sample includes stars ranging in evolution from the lower part of the red-giant branch to the ...
Classification of field dwarfs and giants in RAVE and its use in stellar stream detection
Galaxy Astrophysics (astro-ph.GA)
2011/1/7
An efficient separation between dwarfs and giants in surveys of bright stars is important, especially for studies in which distances are estimated through photometric parallax relations.
Surface convection and red giants radii measurements
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/7
The phenomenological models of convection use characteristic length scales they do not determine but that are chosen to fit solar or stellar observations. We investigate if changes of these length sca...
Chemical abundances in metal-poor giants: limitations imposed by the use of classical 1D stellar atmosphere models
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/29
In this work we have used 3D hydrodynamical (CO5BOLD) and 1D hydrostatic (LHD) stellar atmosphere models to study the importance of convection and horizontal temperature inhomogeneities in stellar abu...
3D hydrodynamical CO5BOLD model atmospheres of late-type giants: chemical abundances from molecular lines
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/28
We investigate the influence of convection on the formation of molecular spectral lines in the atmospheres of late-type giants. For this purpose we use the 3D hydrodynamical CO5BOLD and classical 1D L...
The Solar System underwent a violent shake-up during its teenage years slinging millions of dark primitive rocks and ice from beyond Neptune into the main asteroid belt, which lies between Mars and Ju...
Kinematics and velocity ellipsoid of m giants。
Spectroscopic binaries among a complete sample of hip- parcos m giants
Spectroscopic binaries hip- parcos m giants
2009/6/16
Spectroscopic binaries among a complete sample of hip- parcos m giants。