Výsledky vyhledávání - "W. Verschueren"

Accuracy of radial-velocity measurements for early-type stars

Autor: M. David, R. E.M. Griffin, W. Verschueren

Publikováno v: ResearcherID

The accuracy with which radial velocities of early-type stars can be measured is limited in practice by the existence of asymmetrical dierences between object and template spectrum, constituting \spectrum mismatch". Our studies of the magnitude of sp

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::370ffe5bbc8ec81ab622406e8bf614d2
https://doi.org/10.1051/aas:2000109

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Minimizing Radial-velocity Errors caused by Spectral-type Mismatch in Early-type Stars

Autor: Myriam Vrancken, W. Verschueren, Marc David

Publikováno v: International Astronomical Union Colloquium. 170:108-112

We present the first results of a long-term study to increase the external accuracy of (relative and absolute) radial velocities of early-type stars below the 1 km/s level. The accuracy suffers mainly from important systematic errors caused by intrin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::57f6c6f36d99156b9031a56d8aba7348
https://doi.org/10.1017/s0252921100048442

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ChemInform Abstract: Discovery of a Series of New Non-Indole 5HT1D Agonists

Autor: M. De Bruyn, G. Van Lommen, W. J. Janssens, Jan Verrelst, M. Schroven, J. E. Leysen, W. Verschueren

Publikováno v: ChemInform. 27

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e66d1bdc64c1a9cbd9ef140581d47228
https://doi.org/10.1002/chin.199612175

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A detailed photometric study of the young stellar cluster NGC 2244

Autor: W. Verschueren, H. Hensberge, C. De Loore

Publikováno v: Astrophysics and Space Science. 170:245-250

We present a brief status report on our ongoing extensive and detailed Walraven photometric observations of the young stellar cluster NGC 2244 in the Rosette Nebula. The observational and reduction procedure is described together with the first resul

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::07fa4a5d33c869a5dd7f49772b7c70dd
https://doi.org/10.1007/bf00652675

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Random-error minimization during cross-correlation of early-type spectra

Autor: M. David, W. Verschueren

Publikováno v: Astronomy and astrophysics: supplement series
ResearcherID

Owing to the typical morphology of spectra of early-type stars, random errors play a much more impor- tant role in the derivation of their radial velocities than in the case of late-type spectra. We derive a generalised lower bound of the random erro

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fee018c9366f9cfb143ce7dcb1195211
https://hdl.handle.net/10067/279020151162165141

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High S/N Echelle Spectroscopy in Young Stellar Groups. I. Observations and Data Reduction

Autor: Anthony G. A. Brown, W. Verschueren, E. de Geus, P. T. de Zeeuw, H. Hensberge, M. David, R. S. Le Poole

Publikováno v: Publications of the Astronomical Society of the Pacific. 109:868

This is the first paper in a series in which we study the kinematical structure and dynamical evolution of OB associations and young stellar clusters. By means of high-resolution high-S/N spectroscopic observations, we aim at obtaining accurate stell

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2fe6e73b9b1dbf8e80dc775ba74ad5cf
https://doi.org/10.1086/133957

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Stellar structure with a Boltzmann factor: An extension to chemically heterogeneous H?He-stars

Autor: W. Verschueren, D. K. Callebaut

Publikováno v: Astrophysics and Space Science. 137:257-266

We present an attempt for an extension of the modified Boltzmann model, which was introduced by Callebautet al. (1982) as an improvement of the polytropic models, to the case of chemically-heterogeneous stars in equilibrium, containing H and He, by p

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c66f717b06f7a4b0e963d8b7b36a5f8f
https://doi.org/10.1007/bf00639993

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Accuracy of radial-velocity measurements for early-type stars I. Spectral-type mismatch in A-type synthetic spectra

Autor: R. E.M. Griffin, W. Verschueren, M. David

Publikováno v: ResearcherID

Measuring accurate radial velocities of rotating early-type (O-B-A) stars using cross-correlation techniques is hampered by the fact that object-template spectrum mismatch causes systematic errors that do not cancel out suciently in these spectra. Th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e1ca6abce7beab646dad8d6e0afd3226
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=ORCID&SrcApp=OrcidOrg&DestLinkType=FullRecord&DestApp=WOS_CPL&KeyUT=WOS:000083979500011&KeyUID=WOS:000083979500011

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