References of "Kaufer, A"
     in
Bookmark and Share    
Full Text
Peer Reviewed
See detailModelling the Fringing of the FORS2 CCD
Walsh, J. R.; Kuntschner, H.; Jehin, Emmanuel ULg et al

in Kaufer, A. (Ed.) The 2007 ESO Instrument Calibration Workshop (2008)

Thinned CCD detectors display fringing which arises from the interference of multiply reflected light in the layers of the CCD. If the layer construction - the thicknesses and refractive indexes of the ... [more ▼]

Thinned CCD detectors display fringing which arises from the interference of multiply reflected light in the layers of the CCD. If the layer construction - the thicknesses and refractive indexes of the layers - is known, then the observed fringing can be accurately modelled and used to correct imaging and spectroscopic data for its effects. In practice the specifications on the actual deposited layer thicknesses may not be known to sufficient accuracy to predict the fringe behaviour. Thus calibration data, in the form of monochromatic flat fields, is required and can be modelled using the technique outlined by Malamuth et al. 2003, which has been applied to ACS CCDs. [less ▲]

Detailed reference viewed: 4 (0 ULg)
Full Text
Peer Reviewed
See detailNew insights into the nature of the SMC WR/LBV binary HD 5980
Foellmi, C.; Koenigsberger, G.; Georgiev, L. et al

in Revista Mexicana de Astronomía y Astrofísica (2008), 44(1), 3-27

We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004-2005. Radial velocity curves for the erupting LBV/WR object (star A ... [more ▼]

We present the results of optical wavelength observations of the unusual SMC eclipsing binary system HD 5980 obtained in 1999 and 2004-2005. Radial velocity curves for the erupting LBV/WR object (star A) and its close WR-like companion (star B) are obtained by deblending the variable emission-line profiles of NIV and NV lines. The derived masses M-A = 58 - 79 M-circle dot and M-B = 51 - 67 M-circle dot, are more consistent with the the stars' location near the top of the HRD than previous estimates. The presence of a wind-wind interaction region is inferred from the orbital phase-dependent behavior of He I P Cygni absorption components. The emission-line intensities continued with the declining trend previously seen in UV spectra. The behavior of the photospheric absorption lines is consistent with the results of Schweickhardt (2000) who concludes that the third object in the combined spectrum, star C, is also a binary system with P-starC similar to 96.5 days, e=0.83. [less ▲]

Detailed reference viewed: 25 (3 ULg)
Full Text
See detailThe Polarization Evolution of the Optical Afterglow of GRB 030329
Greiner, J.; Klose, S.; Reinsch, K. et al

in GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY (2004, September 01)

We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has small coherence length and ... [more ▼]

We report 31 polarimetric observations of the afterglow of GRB 030329 with high signal-to-noise and high sampling frequency. The data imply that the afterglow magnetic field has small coherence length and is mostly random, probably generated by turbulence. [less ▲]

Detailed reference viewed: 8 (0 ULg)
See detailLong-term photometry of Variables IV (Sterken+, 1995)
Sterken, C.; Manfroid, Jean ULg; Beele, D. et al

Report (1996)

This is the fourth catalogue of photometric data in the Stroemgren system obtained during the period June 18, 1992 - August 23, 1994 in the framework of the Long-Term Photometry of Variables (LTPV ... [more ▼]

This is the fourth catalogue of photometric data in the Stroemgren system obtained during the period June 18, 1992 - August 23, 1994 in the framework of the Long-Term Photometry of Variables (LTPV) program at the European Southern Observatory. Since our goal is not absolute (all-sky) photometry, the observations should be used for differential photometry only. The mean values of the r.m.s. deviations of the differential measurements of comparison stars are around (from Table 3 of paper) ------------------------------ y b-y m1 c1 ------------------------------ 0.005 0.002 0.004 0.007 ------------------------------ (2 data files). [less ▲]

Detailed reference viewed: 6 (1 ULg)
Full Text
Peer Reviewed
See detailLong-term photometry of variables at ESO. IV. The fourth data catalogue (1992-1994).
Sterken, C.; Manfroid, Jean ULg; Beele, D. et al

in Astronomy and Astrophysics. Supplement Series (1995), 113

In this paper we present the fourth catalogue of photometric data in the Stroemgren system obtained during the period June 18, 1992-August 23, 1994 in the framework of the Long-Term Photometry of ... [more ▼]

In this paper we present the fourth catalogue of photometric data in the Stroemgren system obtained during the period June 18, 1992-August 23, 1994 in the framework of the Long-Term Photometry of Variables (LTPV) program at the European Southern Observatory. The catalogue is available in computer readable form at the Centre de Donnees de Strasbourg via anonymous ftp 130.79.128.5. [less ▲]

Detailed reference viewed: 7 (0 ULg)
See detailFourth Catalogue of Stars Measured in the Long-Term Photometry of Variables Project (1992 - 1994).
Sterken, C.; Manfroid, Jean ULg; Beele, D. et al

in Fourth Catalogue of Stars Measured in the Long-Term Photometry of Variables Project (1992 - 1994)., by Sterken, C.; Manfroid, J.; Beele, D.; de Koff, S.; Eggenkamp, I. M. M. G.; Göcking, K.; Jorissen, A.; Kaufer, A.; Kuss, C.; Schoenmakers, A. P.; Stil, J. M.; van Loon, J.; Vink, J.; Vrielmann, S.; Wälde, E.. European Southern Observatory, Garching (Germany), Apr 1995, 198 p., (1995)

In this catalogue the authors present the photometric data in the Strömgren photometric system obtained during the period June 18, 1992 - August 23, 1994 in the framework of the Long-Term Photometry of ... [more ▼]

In this catalogue the authors present the photometric data in the Strömgren photometric system obtained during the period June 18, 1992 - August 23, 1994 in the framework of the Long-Term Photometry of Variables (LTPV) program at the European Southern Observatory. The catalogue is available in computer readable form at the Centre de Données de Strasbourg. [less ▲]

Detailed reference viewed: 7 (0 ULg)
See detail1995, Fourth Catalogue of stars measured in the Long-Term Photometry of Variables project.
Sterken, C.; Manfroid, Jean ULg; Beele, D. et al

Book published by ESO (1995)

Not Available

Detailed reference viewed: 5 (0 ULg)