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Category/Subcategory: Natural Sciences/Astronomy

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: 406

Radial mode widths in red giant star spectra observed by Kepler

Author: Mathieu Vrard
The Kepler space mission has observed many solar-like pulsators, and helped to decipher their main characteristics (e.g: mass, radius, rotation). Most of the achievements recently obtained in that domain consist of the analysis of ... more

Views: 193

Photosphere and chromosphere telescope at Hvar Observatory

Author: Jaša Čalogović
The double solar telescope at the Hvar Observatory consists of two Carl Zeiss refractors, attached as one unit on a German parallax mounting. The photosphere telescope has an objective diameter of 217 mm and the chromosphere teles ... more

Views: 356

Roles of Ground-based Solar Observations of Hida Observatory toward the Solar-C Era

Author: Satoru UENO
For the realization of the Solar-C satellite, discussions about scientific themes and preliminary observations are internationally carried out now. At Hida Observatory of Kyoto University, we will play the following roles toward t ... more

Views: 328

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: 477

Numerical simulations of magneto-acoustic wave propagation from the upper convection zone into the chromosphere.

Author: Christian Nutto
The contribution of acoustic waves to the chromospheric heating is still an open question. To discuss this Issue, it is crucial to understand the propagation of waves from the convection zone, where the waves are excited, into the ... more

Views: 485

The Seismic Plus Portal

Author: Kevin Belkacem
The wealth of seismic data available from space borne missions (SOHO, CoRoT, Kepler, SDO,…), and from ground-based observations (GONG, Bison, ground-based large programmes…), is stimulating solar and stellar structure and evo ... more

Views: 485

The additional-mode garden of RRab stars

Author: László Molnár
Space-based photometric missions revealed a surprising abundance of millimagnitude-level additional modes in RR Lyrae stars. The modes that appear in the modulated fundamental-mode (RRab) stars can be ordered into four major categ ... more

Views: 391

Revisiting the Instability Strip for rapidly oscillating Ap stars

Author: Maragrida Cunha
Chemically peculiar stars are stage to a wide variety of physical phenomena. Progress in the understanding of these objects, through the study of their oscillations, can help us characterize these physical phenomena and better und ... more

Views: 356

Asteroseismic signature of a starspot

Author: Emanuele Papini
Stellar acoustic oscillations are affected by magnetic activity, however it is unclear how a single starspot would affect the power spectrum of oscillations. Since the starspot rotates with the star, it causes a perturbation that ... more

Views: 343