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11 papers · 2 filters
Extended-Source Effect and Chromaticity in Two-Point-Mass Microlensing
Ondrej Pejcha, David Heyrovsky
We explore the sensitivity of two-point-mass gravitational microlensing to the extended nature of the source star, as well as the related sensitivity to its limb darkening. We demo…
Combining astrometry with the light-time effect: The case of VW Cep, zeta Phe and HT Vir
P. Zasche, M. Wolf
Three eclipsing binary systems with astrometric orbit have been studied. For a detailed analysis two circular-orbit binaries (VW Cep and HT Vir) and one binary with an eccentric or…
Upper Limits from HESS AGN Observations in 2005-2007
HESS Collaboration, F. Aharonian
AIMS: Very high energy (VHE; E>100 GeV) gamma-ray studies were performed for 18 active galactic nuclei (AGN) from a variety of AGN classes. METHODS: VHE observations of a sample of…
Eclipsing Binaries with Possible Light-Time Effect
Zasche Petr, Zejda Miloslav, Brat Lubos
The period changes of six eclipsing binaries have been studied with focus on the light-time effect. With the least squares method we also calculated parameters of such an effect an…
Eclipsing Binaries Showing Light Time Effect
Petr Zasche
Four eclipsing binaries, which show apparent changes of period, have been studied with respect to a possible presence of the light time effect. With a least squares method we calcu…
New constraints on the Mid-IR EBL from the HESS discovery of VHE gamma rays from 1ES 0229+200
HESS Collaboration, F. Aharonian
AIMS: To investigate the very high energy (VHE: >100 GeV) gamma-ray emission from the high-frequency peaked BL Lac 1ES 0229+200. METHODS: Observations of 1ES 0229+200 at energies a…