28 Result(s)

Chapter and Conference Paper

Dynamical Modeling of the Deep Impact Dust Ejecta Cloud

The collision of Deep Impact with comet 9P/Tempel 1 generated a bright cloud of dust which dissipated during several days after the impact. The brightness variations of this cloud and the changes of its positi...

T. Bonev, N. Ageorges, S. Bagnulo… in Deep Impact as a World Observatory Event: … (2009)

Chapter and Conference Paper

Deep Impact Groundsupport Observations of Comet 9P/Tempel 1: a Student Contribution

The encounter of Deep Impact with comet 9P/Tempel 1 led to an unprecedented coordinated observational ground-based observing campaign which attracted many non-specialists. This paper discusses aspects of obser...

C. Sterken, Y. Bouzid, T. Tuvikene, N. Shafi… in Deep Impact as a World Observatory Event: … (2009)

Chapter and Conference Paper

ESO Spectrophotometry of Comet 9P/Tempel 1

The Deep Impact target comet 9P/Tempel 1 was observed by means of long-slit spectroscopy from two nights before impact up to eight nights after impact, using the ESO VLT UT1, UT2, and ESO NTT telescopes. Spect...

M. Weiler, H. Rauer, C. Sterken… in Deep Impact as a World Observatory Event: … (2009)

Chapter and Conference Paper

The Dusty View of DI from ESO Chile

Around the time of the impact of NASA’s Deep Impact (DI) mission at comet 9P/Tempel 1, in total 6 telescopes with altogether 7 different instruments, located at the La Silla (LSO) and Paranal (VLT) Observatori...

H. Boehnhardt, N. Ageorges, S. Bagnulo… in Deep Impact as a World Observatory Event: … (2009)

Article

On Cross-talk Correction of Images from Multiple-port CCDs

Multi-channel CCD read-out, which is an option offered at most optical observatories, can significantly reduce the time spent on reading the detector. The penalty of using this option is the so-called amplifie...

L. M. Freyhammer, M. I. Andersen, T. Arentoft, C. Sterken… in Experimental Astronomy (2001)

Chapter

The O-C Diagram

We explain the basic principle of the O-C method applied when discussing periodic phenomena. The method is illustrated using observational data of a short-period pulsating variable (BW Vulpeculae, P = 0.020104d),...

C. Sterken in Variable Stars as Essential Astrophysical Tools (2000)

Chapter

Commission 27. Variable Stars (Etoiles Variables)

The three special projects sponsored by Commission 27: the Information Bulletin on Variable Stars (IVBS), the Archives of Unpublished Observations of Variable Stars, and the General Catalogue of Variable Stars...

M. Jerzykiewicz, D. W. Kurtz, L. A. Balona, T. G. Barnes III… in Reports on Astronomy (1997)

Article

Book reviews

R. Mewe, Cornelis de Jager, J. Kleczek, Vincent Icke… in Space Science Reviews (1995)

Chapter and Conference Paper

CCD Photometry: Some Basic Concerns

We review the status of CCD photometry with emphasis on applications in projects that require considerable amounts of observing time at medium-aperture telescopes and at tasks complementing projects carried ou...

C. Sterken in New Developments in Array Technology and Applications (1995)

Chapter

Ten Years of Monitoring Southern Be Stars: Results From the Eso Ltpv Project

A brief description of the brightness and colour variations of 15 southern Be stars, observed between 1982 and 1991 by means of differential photoelectric Strömgren photometry, is given. Seven stars of the sam...

N. Vogt, R. Mennickent, C. Sterken in The Impact of Long-Term Monitoring on Vari… (1994)

Chapter

Long-Term Photometry Of Variables: The Story Of Hd 160529

This paper gives an account of the origin and evolution of the Long-Term Phoiometry of Variables (LTPV) project that, for more than a decade, has been running at the European Southern Observatory in Chile. The LT...

C. Sterken in The Impact of Long-Term Monitoring on Variable Star Research (1994)

Chapter

Photometric Monitoring of Wolf-Rayet Stars Strömgren uvby and narrow-band photometry

We describe our on-going project of photometric monitoring of Wolf-Rayet stars. Our strategy is based on the complementarity between data issued from the Long-Term Photometry of Variables project and data issued ...

E. Gosset, G. Rauw, J. Manfroid, J.-M. Vreux… in The Impact of Long-Term Monitoring on Vari… (1994)

Article

A complete database of photoelectric and photographic multiaperture photometry of Galaxies

We present a complete database of photoelectric and photographic multiaperture photoelectric photometry of galaxies. The database contains all data published prior to 1991, in all standard photometric bands fr...

G. Longo, G. Busarello, A. Rifatto, E. Acampa, A. D’Orsi, P. Paura… in Il Nuovo Cimento C (1992)

Article

β Cephei stars from a photometric point of view

This is an observational review, with an emphasis on photometric data and their interpretation. Two lists are presented, one containing β Cephei stars, and the other, β Cephei suspects. These lists then serve as ...

C. Sterken, M. Jerzykiewicz in Space Science Reviews (1992)

Chapter and Conference Paper

Calibration of Large Batches of Photographic Images

During the 1985–1986 appearance of Comet Halley, hundreds of photographic images were taken by the authors. These images were obtained with several telescopes, using different photographic emulsions and filter...

Z. Liu, C. Sterken, H. Hensberge, J.-P. De Cuyper in Digitised Optical Sky Surveys (1992)

Chapter and Conference Paper

Photometric Variability of Luminous Blue Variables in Quiescent State

This paper reviews the major new facts on microvariability of LBV’s of the last few years, and discusses some observational requirements for the future.

C. Sterken in Physics of Luminous Blue Variables (1989)

Chapter and Conference Paper

Photometry of P/Halley (1982i)

We report the results of photoelectric observations carried out during several weeks between 1985 September 12, and 1986 June 24. All measurements were made using the standard IAU/IHW cometary filters. Large a...

C. Sterken, J. Manfroid, C. Arpigny in Exploration of Halley’s Comet (1988)