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A grid of NLTE corrections for magnesium and calcium in late-type giant and supergiant stars: application to Gaia
formation radiative transfer stars late-type atmospheres abundances
2011/10/18
We investigate NLTE effects for magnesium and calcium in the atmospheres of late-type giant and supergiant stars. The aim of this paper is to provide a grid of NLTE/LTE equivalent width ratios W/W* of...
The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities
Planetary systems – Stars: activity – Stars: chromospheres – Line: profi les – Techniques: radial velocities – Techniques:spectroscopic
2011/10/17
Context. Searching for extrasolar planets through radial velocity measurements relies on the stability of stellar photospheres. Aims. We aim at characterizing the statistical properties of magnetic ac...
Dynamical Opacity-Sampling Models of Mira Variables. II: Time-Dependent Atmospheric Structure and Observable Properties of 4 M-Type Model Series
stars: AGB and post-AGB, stars: atmospheres, stars: variables: other, stars: mass loss
2011/10/11
We present 4 model series of the CODEX dynamical opacity-sampling models of Mira variables with solar abundances, designed to have parameters similar to $o$ Cet, R Leo and R Cas. We demonstrate that t...
Modeling of differential rotation in rapidly rotating solar-type stars
Modeling differential rotation rapidly rotating solar-type stars
2011/10/9
We investigate differential rotation in rapidly rotating solar-type stars by means of an axisymmetric mean field model that was previously applied to the sun. This allows us to calculate the latitudin...
A photometric study of the w uma type eclipsing binary v376 and
photometric eclipsing binary v376 w uma type
2009/7/10
A photometric study of the w uma type eclipsing binary v376 and。
Infrared Imaging and Optical Imaging and Spectroscopy of (mostly) type I Planetary Nebulae II
Planetary Nebulae II Optical Imaging Spectroscopy Infrared Imaging
2009/6/16
Infrared Imaging and Optical Imaging and Spectroscopy of (mostly) type I Planetary Nebulae II。
The Extreme Type I Planetary Nebula M2-52。
Expansion velocities from different ions of planetary nebulae with [wc]-type central stars
different ions planetary nebulae [wc]-type central stars
2009/6/11
Expansion velocities from different ions of planetary nebulae with [wc]-type central stars。
Implications of dust for the radiation spectrum of shell-type pn models
radiation spectrum shell-type pn models
2009/6/11
Implications of dust for the radiation spectrum of shell-type pn models。
PN G291.4-00.3：a new type i planetary nebula。