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Evidence for enhanced chromospheric Ca II H & K emission in stars with close-in extrasolar planets
Planets and satellites magnetic fields Planet star interactions chromospheres
2012/2/23
The planet-star interaction is manifested in many ways. It was found out that a close-in exoplanet causes small but measurable variability in the cores of a few lines in the spectra of several stars w...
Origins of the H, He I, and Ca II Line Emission in Classical T Tauri Stars
Solar and Stellar Astrophysics (astro-ph.SR)
2011/1/6
We perform local excitation calculations to obtain line opacities and emissivity ratios and compare them with observed properties of H, He I, O I, Ca II, and Na I lines to determine the density, tempe...
Radiative emission of solar features in Ca II K
Sun full-disk observations Sun atmosphere Sun magnetic fields
2010/3/9
We investigated the radiative emission of different types of solar features in the spectral range of the Ca II K line.
We analyzed full-disk 2k x 2k observations from the PSPT Precision Solar Photom...
STARK BROADENING PARAMETER TABLES FOR Ca II LINES OF ASTROPHYSICAL INTEREST
STARK BROADENING PARAMETER TABLES ASTROPHYSICAL INTEREST Ca II LINES
2009/4/23
STARK BROADENING PARAMETER TABLES FOR Ca II LINES OF ASTROPHYSICAL INTEREST。
MEASURED STARK WIDTH AND SHIFT OF 393.367 nm Ca II RESONANCE SPECTRAL LINE
MEASURED STARK WIDTH RESONANCE SPECTRAL LINE Ca II
2009/4/21
MEASURED STARK WIDTH AND SHIFT OF 393.367 nm Ca II RESONANCE SPECTRAL LINE。
Using a semiclassical approach, we have calculated electron−, proton−,
and He III−impact line widths and shifts for 4 Ca IX and 48 Ca X multiplets
as a function of temperature and ...