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Category/Subcategory: Natural Sciences/Astronomy

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

Time-series spectroscopy of the eclipsing binary AB Cas with a pulsating component

Author: Kyeongsoo Hong
We present high resolution spectra of the eclipsing binary AB Cas with a δ Sct-type pulsating star, which were obtained using the Bohyunsan Optical Echelle Spectrograph in Korea. The radial velocities (RVs) for the primary and se ... more

Views: 300

Kepler – K2: A Search for Very Red Variables

Author: Mag. Erich Hartig
The NASA Kepler K2 mission offers new opportunities to search for long period variables (LPVs) along the ecliptic plane. We present first results of our observing proposals for ‘Super-Red-Targets’ in the Kepler K2 Campaigns ... more

Views: 444

Validating Spherical Born Kernels for Meridional Flows

Author: Vincent Böning
We present the current status of an undergoing validation of a recently developed model for computing spherical Born approximation sensitivity functions for flows. In a first step, power spectra and reference cross-correlations fr ... more

Views: 563

RR Lyrae in M4

Author: Charles Kuehn
Observations by Kepler/K2 have revolutionized the study of RR Lyrae stars by allowing the detection of new phenomena, such as low amplitude additional modes and period doubling, which had not previously been seen from the ground. ... more

Views: 214

Forecasting the arrival of Coronal Mass Ejections: The Drag-Based Model

Author: Bojan Vrsnak
We present a new space weather online forecast-tool for predicting the arrival of Interplanetary Coronal Mass Ejections (ICMEs). The forecast-tool is based on the “Drag-Based Model” (DBM), developed in the frame of the Europea ... more

Views: 787

WP80: Synoptic Observations: Solar Physics Research Network Group (SPRING)

Author: Markus Roth
High-resolution telescopes (such as SST, GREGOR and the future EST and ATST) allow observations of only a small fraction of the solar surface. Real-time context data showing the large-scale dynamics and magnetism at different l ... more

Views: 296

Non-LTE inversion of spectropolarimetric and spectroscopic observations of a small active-region filament observed at the VTT

Author: Pavol Schwartz
An active-region filament in the active region NOAA 12159 (at solar disk coordinates [x,y] = [225,-440] arcsec) was observed with the Vacuum Tower Telescope at Tenerife on 11 September 2014. Full-Stokes spectropolarimetric observa ... more

Views: 631

Effects of the HeII ionization zones on oscillation frequencies Applications to Kepler and CoRoT stars

Author: mutlu yildiz
Solar-like oscillation frequencies of 93 target stars of Kepler and CoRoT are analyzed. In the present study, we present results for two of them. Recently, two new reference frequencies nu_min1 and nu_min2 are found in the spacin ... more

Views: 469