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Category/Subcategory: Natural Sciences/Astronomy

Simulations of the Visible Tunable Filter for the Daniel K. Inouye Solar Telescope

Author: Wolfgang Schmidt
The Visible Tunable Filter (VTF) is a narrowband tunable filter system for imaging spectroscopy and spectropolarimetry based. The instrument will be one of the first-light instruments of the Daniel K. Inouye Solar Telescope that i ... more

Views: 397

Filaments data since 1919: A basis for statistics

Author: Jean Aboudarham
From 1919 to 2002, Paris-Meudon Observatory published synoptic maps of the Solar activity. Together with maps, tables were provided, containing some information concerning at least filaments. The board of Paris Observatory funded ... more

Views: 415

Stellar Ages and Galactic Evolution

Author: Saskia Hekker
There is no one observable that is sensitive to age and age alone. However, some combinations of parameters such as large frequency separation and small frequency separation are more sensitive to age. The age can be better constra ... more

Views: 471

Quasi-periodic pulsations in stellar flares

Author: Anne-Marie Broomhall
Quasi-periodic pulsations (QPPs) are a common feature of solar flares that are observed in many different wavelengths. Although QPPs appear not to be as abundant in white light Kepler flare light curves as they are in solar flar ... more

Views: 417

Observations of Red Giants with SONG

Author: Pere L. Pallé
One of the outstanding and unforeseen results from the Kepler mission is our new insight and understanding of red giant stars. These highly evolved stars, which are in the last stages of their life, provide extremely useful inform ... more

Views: 391

Introducing SISMA, the HARPS archive of the CoRoT asteroseismic targets

Author: Ennio Poretti
The online archive SISMA (Spectroscopic Indicators in a SeisMic Archive) was created in the framework of the SpaceInn project, with the goal of providing to the scientific community the results of the CoRoT ground-based asterosei ... more

Views: 308

Measurements of helioseismic travel times

Author: Markus Roth
In time-distance helioseismology wave travel times are measured from the cross-correlation between Doppler velocities recorded at any two locations on the solar surface. All local helioseismology inferences rely critically on the ... more

Views: 416

20 Years of GONG: p Mode Parameters and the Solar Cycle

Author: René Kiefer
The properties of solar acoustic oscillations are known to vary with the solar cycle. With 20 years of continuous observations by GONG, we are now in the position to carry out a comparison of the variation of the p mode parameters ... more

Views: 416

Improving 1D Stellar Models with 3D Atmospheres

Author: Jakob Mosumgaard
How to improve traditional 1D models of stellar structure and evolution using results from sophisticated 3D simulations of stellar atmospheres. More specifically, how T-tau relations from Trampedach et al. (2014, MNRAS, 442, 805) ... more

Views: 501

Efficient solar scene wavefront estimation with reduced systematic and RMS centroid errors

Author: Narsireddy Anugu
Wave front sensing for solar telescopes is commonly implemented with Shack-Hartmann sensors. The Shack-Hartmann lenslet sub-aperture solar image shifts/slopes are usually estimated with correlation algorithms. The sub-pixel precis ... more

Views: 480