Ground-based and airborne instrumentation for astronomy
- J. Vandersteen, G. Raskin, C. Aerts
- Physics
- 2010
HERMES: a high-resolution fibre-fed spectrograph for the Mercator telescope
- G. Raskin, H. Winckel, J. Winkler
- Physics
- 1 November 2010
The HERMES high-resolution spectrograph project aims at exploiting the specific potential of small but flexible telescopes in observational astrophysics. The optimised optical design of the…
Atmospheric parameters of 169 F-, G-, K- and M-type stars in the Kepler field
- J.Molenda-Zakowicz, S. Sousa, G. Raskin
- Physics, Geology
- 25 June 2013
The asteroseismic and planetary studies, like all research related to stars, need precise and accurate stellar atmospheric parameters as input. We aim at deriving the effective temperature (Teff),…
GRAVITY-MODE PERIOD SPACINGS AS A SEISMIC DIAGNOSTIC FOR A SAMPLE OF γ DORADUS STARS FROM KEPLER SPACE PHOTOMETRY AND HIGH-RESOLUTION GROUND-BASED SPECTROSCOPY
- T. V. Reeth, A. Tkachenko, H. Winckel
- Physics
- 8 April 2015
Gamma Doradus stars (hereafter γ Dor stars) are gravity-mode pulsators of spectral type A or F. Such modes probe the deep stellar interior, offering a detailed fingerprint of their structure.…
Post-AGB stars with hot circumstellar dust: binarity of the low-amplitude pulsators
- H. Winckel, T. Evans, W. Zima
- Physics, Geology
- 24 June 2009
Context. The influence of binarity on the late stages of stellar evolut ion. Aims. While the first binary post-AGB stars were serendipitously d iscovered, the distinct characteristics of their…
Long term photometric monitoring with the Mercator telescope. Frequencies and mode identification of
- P. D. Cat, M. Briquet, L. Decin
- Physics
- 1 February 2007
Aims. We selected a large sample of O-B stars that were considered as (candidate) slowly pulsating B, beta Cep, and Maia stars after the analysis of their hipparcos data. We analysed our new seven…
Photometric multi-site campaign on the open cluster NGC 884 I. Detection of the variable stars
- S. Saesen, F. Carrier, J. Debosscher
- Physics
- 7 January 2010
Context. Recent progress in the seismic interpretation of field β Cep stars has resulted in improvements of the physics in the stellar structure and evolution models of massive stars. Further…
Mass ratio from Doppler beaming and Rømer delay versus ellipsoidal modulation in the Kepler data of KOI-74
- S. Bloemen, T. Marsh, S. V. Eck
- Physics, Geology
- 24 February 2012
We present a light curve analysis and radial velocity study of KOI-74, an eclipsing A star\(+\) white dwarf binary with a 5.2 day orbit. Aside from new spectroscopy covering the orbit of the system,…
Binary central stars of planetary nebulae with long orbits: the radial velocity orbit of BD+33°2642 (PN G052.7+50.7) and the orbital motion of HD 112313 (PN LoTr5)
- H. Winckel, A. Jorissen, F. Merges
- Physics
- 1 March 2014
Aims. We study the impact of binary interaction processes on the evolution of low- and intermediate-mass stars using long-term monitoring of their radial velocity. Here we report on our results on…
Close binary and other variable stars in the solar-age Galactic open cluster M 67
We present multi-colour time-series CCD photometry of the solar-age galactic open cluster M 67 (NGC 2682). About 3600 frames spread over 28 nights were obtained with the 1.5 m Russian-Turkish and 1.2…
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