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Category/Subcategory: Natural Sciences/Astronomy

16CygA&B and Kepler Legacy values : Differences between the values of frequencies by different fitters

Author: Ian Roxburgh
The differences between the oscillation frequencies and uncertainty estimates of a star derived by different fitters can be large, sufficiently large so that, were one to find a stellar model that fitted one frequency set ($\chi^ ... more

Views: 956

Technique for observation derived boundary conditions for Space Weather

Author: Paolo Pagano
We propose a new efficient and accurate modelling technique suitable for the next generation of Space Weather predictive tools. Specifically, we put forward an approach that can provide interplanetary Space Weather forecasting mod ... more

Views: 145

The CoMP-S and SCD spectropolarimeters at the Lomnicky Peak Observatory as supporting instrumentation to EST.

Author: Peter Gomory
We present actual status and observing possibilities of the Coronal Multi-channel Polarimeter (CoMP-S) and Solar Chromospheric Detector (SCD) installed at the Lomnicky Peak Observatory. The CoMP-S is a dual beam spectropolarimeter ... more

Views: 257

Spherical Born Kernels for Flows in Time-Distance Helioseismology

Author: Vincent Böning
We extend an existing Born approximation model for calculating the linear sensitivity of helioseismic travel-times to flows from Cartesian to spherical geometry. This development is necessary to use the Born approximation for in ... more

Views: 540

Seismic Inference of 58 Stars using full-length Kepler data sets

Author: Orlagh Creevey
We present stellar properties of 58 stars from a seismic inference using full-length data sets from Kepler (mass, age, radius, distances). These stars comprise active stars, planet-hosts, solar-analogs, and binary systems. By empl ... more

Views: 350

Looking for Magnetic Field in Kepler Red Giants

Author: Jérôme Ballot
Spectropolarimetric measurements allow us to detect and measure magnetic field through Zeeman effect in stellar photospheres. We observed with the spectropolarimeters Narval (at Telescope Bernard Lyot) and ESPADONS (at CFHT) a few ... more

Views: 417

OBSERVATIONAL AND PHYSICAL PARAMETERS OF TYPE I CHAINS AND THEIR ASSOCIATION WITH FLARES IN X-RAY

Author: Zuleika Sodré
We report the analysis of the observational parameters of the two Radio Noise Storms (RNS): one day in the occurrence of the solar flares in X-rays and one day without the presence of the flare. The spectral information about the ... more

Views: 395

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: 328

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: 508

Stell parameters of main sequence turn-off star candidates observed with the LAMOST and Kepler

Author: Yaqian Wu
Main sequence turn-off (MSTO) stars are advantaged indicators of Galactic evo- lution since their ages could be robustly estimated by atmospheric parameters. Hundreds of thousands of MSTO stars have been selected from the LAMOST ... more

Views: 507