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Category/Subcategory: Natural Sciences/Astronomy


Author: Michael Burton
Circinus X-1 exhibited a bright X-ray flare in late 2013. Follow-up observations with Chandra and XMM-Newton from 40 to 80 days after the flare reveal a bright X-ray light echo in the form of four well-defined rings with radii fro ... more

Views: 563

The SpaceInn-SISMA database: characterization of a large sample of variable and active stars by means of HARPS spectra

Author: Monica Rainer
We created a large database of physical parameters and variability indicators by fully reducing and analysing the large number of spectra taken to complement the asteroseismic observations of the CoRoT satellite. 7103 spectra of 2 ... more

Views: 601

Measurement of the VLT pupil motions using a 2 × 2 lenslet evaluated aberrations

Author: Narsireddy Anugu
We present the telescope pupil tracking strategy for the GRAVITY interferometer.

Views: 457

Design of a next generation synoptic solar observing network: solar physics research integrated network group (SPRING)

Author: Markus Roth
Long-term synoptic observations of the Sun in different wavelength regions are essential to understand its secular behavior. Such observations have proven very important for discovery of 11 year solar activity cycle, 22 year magne ... more

Views: 292

The Importance of Long-term Synoptic Observations and Data Sets for Solar Physics and Helioseismology

Author: Markus Roth
A casual single glance at the Sun would not lead an observer to conclude that it varies. The discovery of the 11-year sunspot cycle was only made possible through systematic daily observations of the Sun over 150 years and even to ... more

Views: 496

Spicules and their on-disk counterparts - the main driver for solar chromospheric heating?

Author: Klaus Gerhard Puschmann
The question how the outer solar atmosphere is heated from solar photospheric temperatures of about 5800K up to solar chromospheric and coronal temperatures of about 20.000K and millions of degrees respectively, remained without a ... more

Views: 1027

Meridional Circulation and Global Solar Oscillations

Author: Markus Roth
We investigate the influence of large-scale meridional circulation on solar p-modes by quasi-degenerate perturbation theory, as proposed by Lavely and Ritzwoller (1992). As an input flow we use various models of stationary meridio ... more

Views: 549

A new cosmic coincidence in conjunction with the cosmic expansion.

Author: Christian Nutto
The discovery of the cosmic acceleration (Perlmutter & Riess, 1999; Perlmutter et al., 1999; Riess et al., 1998) along with the presence of dark matter is one of the most intriguing puzzles in modern physics and cosmology. Up to n ... more

Views: 417

Validation of Spherical Born Approximation Sensitivity Functions for Measuring Deep Solar Meridional Flow

Author: Markus Roth
Accurate measurements of deep solar meridional flow are of vital interest for understanding the solar dynamo. In this paper, we validate a recently developed method for obtaining sensitivity functions (kernels) for travel-time mea ... more

Views: 180