C. Sterken

Vrije Universiteit Brussel

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T. Arentoft

Aarhus University

Jean Manfroid

University of Liège

A. M. van Genderen

Leiden University

H. W. Duerbeck

Vrije Universiteit Brussel

M. de Groot

Armagh Observatory & Planetarium

T. Tuvikene

University of Tartu

Amy Abercrombie King

Urology San Antonio

H. Hensberge

Royal Observatory of Belgium

Makram Bouzid

Nokia (France)

L. M. Freyhammer

University of Central Lancashire

Cooperative Institutions

Centre National de la Recherche Scientifique

Max Planck Society

Consejo Nacional de Investigaciones Científicas y Técnicas

University of Sydney

University of Liège

Australian National University

European Southern Observatory

Commonwealth Scientific and Industrial Research Organisation

Institute of Astronomy

European Southern Observatory

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Springer biographies (2020)

C. Sterken Amy Abercrombie King

Memorandum

10.1007/978-3-030-46538-4_4

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Book Review: ASTRONOMICAL HERITAGES: ASTRONOMICAL ARCHIVES AND HISTORIC TRANSITS OF VENUS

C. Sterken H. W. Duerbeck I. S. Glass

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Monitoring Variable Stars From the Southern Hemisphere

R. E. Mennickent E. Unda C. Sterken

Variable star

Western hemisphere

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Mass Loss of B1Ia-O Supergiants and Evolutionary Consequences

Springer eBooks (1979)

B. Wolf C. Sterken

Blue supergiant

Table (database)

10.1007/978-94-009-9452-2_5

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The contact binary GSC 04778-00152 with a visual companion

arXiv (Cornell University) (2008)

T. Tuvikene T. Eenmäe C. Sterken Erik Brogt

Photometric and spectroscopic observations of the unstudied 12th-magnitude eclipsing binary GSC 04778-00152 are presented. We report the discovery of a visual companion about 1 mag fainter and 2 arcsec away from the binary. By subtracting the light contribution of the visual companion, we obtain the UBVRI light curves of the binary system alone. The shape of the light curve indicates that GSC 04778-00152 is an A-type W UMa contact binary. From light-curve modeling, we derive parameters of the binary system.

Contact binary

10.48550/arxiv.0809.1970

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Astronomical heritages : astronomical archives and historic transits of venus : a selection of papers prepared by working groups "Astronomical Archives and Transits of Venus" of Commission 41 of the International Astronomical Union

C. Sterken H. W. Duerbeck

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Spectroscopy of HD 77581 and the mass of Vela X-1

arXiv (Cornell University) (1995)

M. H. van Kerkwijk J.A. van Paradijs E. J. Zuiderwijk G. Hammerschlag–Hensberge L. Kaper

We present new high-resolution, high signal-to-noise optical spectra of HD 77581, the optical counterpart of the X-ray source Vela X-1, and determine radial velocities from these spectra, as well as from high-resolution IUE spectra and from digitized photographic spectra. The measured velocities show strong deviations from a pure Keplerian radial-velocity curve, which are autocorrelated within one night, but not from one night to another. Since lines of different ions exhibit very similar changes in profile, these deviations most likely reflect largescale motions of the stellar surface akin to non-radial pulsations. A possible cause could be that the varying tidal force exerted by the neutron star in its eccentric orbit excites high-order pulsation modes in the optical star which interfere constructively for short time intervals. The effect of such velocity excursions on the orbital solution is estimated by means of a Monte-Carlo simulation technique. We investigate sources of systematic error, due to, e.g., the tidal deformation of the star, and find, in particular, evidence for a systematic perturbation of the radial velocity near the time of velocity minimum. This possible distortion severely compromises the accuracy of the radial-velocity amplitude, leading to a 95% confidence range of 18.0-28.2kms(-1) The corresponding 95% confidence limits of the masses are given by M(x) = 1.9(-0.5)(+0.7) M. and M(opt) = 23.5(-1.5)(+2.2) M..

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Vela

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The Rise and Fall of V4334 Sagittarii (Sakurai’s Object)

The Astronomical Journal (2000)

H. W. Duerbeck W. Liller C. Sterken S. Benetti A. M. van Genderen

CCD UBVRi photometry of the final helium flash object V4334 Sgr (Sakurai's object) carried out during 1997–1999 is presented, and the light curve from its prediscovery rise to the dust obscuration phase is constructed. The optical light curve can be divided into four sections, the rise to maximum, the maximum, the dust onset, and the massive dust shell phase. The color indices show a general increase with time, first because of the photospheric expansion and cooling and later because of the dust-forming events. The energy distributions for the years 1996–1999 show that an increasing part of the energy is radiated at infrared wavelengths. In 1996 the infrared excess is likely caused by free-free radiation in the stellar wind. Starting from 1997 or 1998 at the latest, carbon dust grains are responsible for the more and more dramatic decrease of optical radiation and the growing infrared excess. Its photometric behavior in 1998–1999 mimics the "red declines" of R CrB variables; the amplitude, however, is more extreme than any fading ever observed in an R CrB star. Evidence is given that a complete dust shell has formed around V4334 Sgr. It therefore shows similarities with dust-forming classical novae, although it is evolving ∼20 times more slowly. Its luminosity increased by a factor 4 between 1996 and 1998. A comparison of timescales of the final helium flash objects FG Sge, V605 Aql, and V4334 Sgr shows that the observed photometric and spectroscopic features are similar, while V4334 Sgr is the most rapidly evolving object to date.

Circumstellar dust

Infrared excess

10.1086/301349

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Citations (42)

Stellar variability in Trumpler 24. II

Astronomische Nachrichten (2005)

Jian-Ning Fu Makram Bouzid C. Sterken

We present a second season of CCD time-series observations of Trumpler 24 in Johnson B and V obtained in 2004. 18 new variable stars are found, 15 variables discovered in Paper I are discussed, and the variability class of 5 of them is given. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Variable star

10.1002/asna.200410354

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Preface

EAS Publications Series (2011)

C. Sterken

10.1051/eas/1149000

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