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Category/Subcategory: Natural Sciences/Astronomy

High cadence observations and analysis of spicular-type events using CRISP onboard SST

Author: Juie Shetye
A statistical study of spectral images, taken from the CRISP instrument at the Swedish 1-m Solar Telescope in H-alpha 656.28 nm of fast spicules, present Doppler velocities in the range of -41km/s to +41 km/s. Remarkably, many ... more

Views: 385

Time-series spectroscopy of the pulsating eclipsing binary XX Cephei

Author: Jae-Rim Koo
Oscillating Algol-type eclipsing binaries (oEA) are very interesting objects that have three observational features of eclipse, pulsation, and mass transfer. Direct measurement of their masses and radii from the double-lined radia ... more

Views: 385

Anomalous high-amplitude peaks in the Fourier spectra of Kepler red giants

Author: Isabel Colman
We present an analysis of 93 oscillating red giants from NASA's Kepler mission which exhibit anomalous single-frequency peaks in their amplitude spectra. These peaks may be indicative of binary star systems, with frequencies such ... more

Views: 247

SOLARNET III / HELAS VII / SpaceInn Conference "The Sun, the stars, and solar-stellar relations"

Author: Ariane Schad
SOLARNET III / HELAS VII / SpaceInn Conference "The Sun, the stars, and solar-stellar relations" Freiburg, August 31-September 4, 2015 The 3rd SOLARNET / 7th HELAS / SpaceInn international conference "The Sun, the stars, an ... more

Views: 769

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: 324

Evolutionary states of red-giants stars: how to obtained them from “short” time series data from K2 and Tess

Author: Saskia Hekker
From its surface it can be difficult to determine whether a red-giant star is in its Helium-core-burning phase or only burning Hydrogen in a shell around an inert Helium core. Stars in either of these stage can have simi ... more

Views: 422

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: 453

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: 419

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: 885

Comparison of different populations of granular features in the solar photosphere

Author: Mariachiara Falco
One of the most visible manifestations of convective motions occurring in the uppermost layers of the solar convection zone is the granulation. Strong magnetic fields hinder the convective motions, but the appearance of bright ... more

Views: 18