Zobrazeno 1 - 10
of 113
pro vyhledávání: '"K. A. van der Hucht"'
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 449:1834-1844
We present analyses of new optical spectra of three WC9 stars, WR 88, WR 92 and WR 103 to test the suggestion that they exemplify an evolutionary sequence amongst the WC9 stars. The spectrum of WR 88 shows conspicuous lines of N iii and N iv, leading
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b6dc6fbe7c28e5b00fdf7f874c7f5a2
https://doi.org/10.1093/mnras/stv409
https://doi.org/10.1093/mnras/stv409
Publikováno v:
Astrophysics and Space Science. 345:133-145
We discuss a collection of archival multi-colour photometric data of the variable WC9-type Wolf-Rayet star WR 103 = HD 164270 observed over a time interval of eleven years. The photometric systems used are Walraven VBLUW, Bessel UBV and Stromgren uvb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ee9f86a8183c8143cc1ab2f4ccfa4fae
https://doi.org/10.1007/s10509-013-1381-x
https://doi.org/10.1007/s10509-013-1381-x
Autor:
Peredur M. Williams, Yaël Nazé, Jean-Marie Vreux, Hugues Sana, K. A. van der Hucht, Eric Gosset, Paul A. Crowther, Grégor Rauw, M. De Becker
Publikováno v:
Astronomy & Astrophysics, 432(3), 985-998. EDP Sciences
We analyse the optical spectrum of the very massive binary system WR 20a (WN6ha + WN6ha). The most prominent emission lines, Halpha and He ii lambda 4686, display strong phase-locked profile variability. From the variations of their equivalent widths
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72ff8364bfa820f06f20144a81504439
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005A&A...432..985R&db_key=AST&high=3ed1d2904228012
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2005A&A...432..985R&db_key=AST&high=3ed1d2904228012
Autor:
H. Schild, M. Güdel, R. Mewe, W. Schmutz, A. J. J. Raassen, M. Audard, T. Dumm, K. A. van der Hucht, M. A. Leutenegger, S. L. Skinner
Publikováno v:
Astronomy & Astrophysics. 422:177-191
We present XMM-Newton observations of 2 Velorum (WR11, WC8+O7.5III, P =78.53 d), a nearby Wolf-Ray binary system, at its X-ray high and low states. At high state, emission from a hot collisional plasma dominates from about 1 to 8 keV. At low state, p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9250bc44e1d198a296a76718f2cba0eb
https://doi.org/10.1051/0004-6361:20047035
https://doi.org/10.1051/0004-6361:20047035
Autor:
Manuel Güdel, Werner Schmutz, A. J. J. Raassen, H. Schild, Stephen L. Skinner, Marc Audard, R. Mewe, Maurice A. Leutenegger, T. Dumm, K. A. van der Hucht
Publikováno v:
Nuclear Physics B - Proceedings Supplements. 132:697-700
The spectrum of the binary system γ 2 Velorum (WC8 + O7.5III) has been observed with RGS and EPIC-MOS aboard XMM-Newton. The system shows a 'high state' when the O-star is between the Wolf-Rayet star and the observer (near periastron) and a 'low sta
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e4b1ef2d1e989075c06983928ae5d13
https://doi.org/10.1016/j.nuclphysbps.2004.04.124
https://doi.org/10.1016/j.nuclphysbps.2004.04.124
Autor:
N.A. Miller, Manuel Güdel, A. J. J. Raassen, R. Mewe, Joseph P. Cassinelli, K. A. van der Hucht
Publikováno v:
Advances in Space Research. 32:1167-1173
The first high-resolution X-ray spectra of the B0.2V star τ Scorpii obtained during 22.5ks on Aug. 20, 2001 with the RGS Grating and the epic-mos ccd spectrometers on board XMM-Newton exhibit bright emission lines of the H- and He-like ions of C, N,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eb6c30368caccbf080602aa964d5d2bc
https://doi.org/10.1016/s0273-1177(03)00324-7
https://doi.org/10.1016/s0273-1177(03)00324-7
Autor:
Manuel Güdel, K. A. van der Hucht, A. J. J. Raassen, N.A. Miller, R. Mewe, Joseph P. Cassinelli
Publikováno v:
Astronomy & Astrophysics, 398, 203-211. EDP Sciences
We report the analysis of the first high-resolution X-ray spectrum of the B0.2V star τ Scorpii obtained with the Reflection Grating Spectrometers ( )a nd the- spectrometers on board XMM-Newton. The spectrum ex
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e241a8ca897b303393fa047f99329005
https://doi.org/10.1051/0004-6361:20021577
https://doi.org/10.1051/0004-6361:20021577
Autor:
R. Mewe, Manuel Güdel, A. J. J. Raassen, Jean-Marie Vreux, Igor I. Antokhin, Werner Schmutz, Grégor Rauw, K. A. van der Hucht
Publikováno v:
Astronomy & Astrophysics, 402, 653-666. EDP Sciences
We report the analysis of the first high-resolution X-ray spectra of the Wolf-Rayet (WR) object WR 25 (HD 93162, WN6ha+O4f) obtained with the reflection grating spectrometers (rgs )a nd theeuropean photon imaging cameras (epic-mos and pn) ccd spectro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5e21d84a38359cf06e84aa550430b31c
https://doi.org/10.1051/0004-6361:20030119
https://doi.org/10.1051/0004-6361:20030119
Publikováno v:
Astronomy and Astrophysics
Astronomy and Astrophysics, 385, 619-631
Astronomy and Astrophysics, 385, 619-631
Photometric and spectroscopic monitoring campaigns of WR 46 (WN3p), as presented in Veen et al. (2002a,b; hereafter Papers I and II, respectively), yield the following results. The light- and colour variations reveal a dominant single-wave period of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d21f94ed2efdd726ac6b02f4d55e748a
https://doi.org/10.1051/0004-6361:20020076
https://doi.org/10.1051/0004-6361:20020076
Publikováno v:
Astronomy & Astrophysics. 384:1012-1022
We discuss the variability of WR 86 (WC7 (+B0 III)), a known visual binary, confirmed by Hubble Space Telescope observations (Niemela et al. [CITE]). Photometric observations show a fairly smooth light curve with a time scale of ~3.5 h and a light am
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e16b241d8af2e8bc1ac6ea2675145a6b
https://doi.org/10.1051/0004-6361:20020085
https://doi.org/10.1051/0004-6361:20020085