Zobrazeno 1 - 10
of 79
pro vyhledávání: '"C. A. Karl"'
Publikováno v:
Journal of Vision
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=r3c4b2081b22::5540e968b17c4906f475c2841600ab5a
Publikováno v:
Journal of Hematology & Oncology
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=r3c4b2081b22::357408b8f4d343dc9c30122c369efff7
Autor:
Ulrich Heber, Lev R. Yungelson, Sabine Moehler, S. Catalán, C. A. Karl, Bruno Leibundgut, Horst Drechsel, Gijs Nelemans, A. Stroer, Alvio Renzini, Detlev Koester, Dieter Reimers, Thorsten Lisker, T. R. Marsh, R. Napiwotzki, Derek Homeier
Publikováno v:
Astronomy & Astrophysics. 638:A131
Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey for double degenerate (DD) b
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d61eaeb7b2b5dd28ac37d879ab3bab4a
https://doi.org/10.1051/0004-6361/201629648
https://doi.org/10.1051/0004-6361/201629648
Akademický článek
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Publikováno v:
Astronomy & Astrophysics. 434:637-647
The sharp Hα NLTE line cores of hydrogen-rich (DA) white dwarfs allow their projected rotational velocities to be determined. High resolution optical spectra of 22 stars obtained with the Keck I telescope are matched by synthetic spectra computed fr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6cbe3488b5c9246caf3311009b72d544
https://doi.org/10.1051/0004-6361:20041437
https://doi.org/10.1051/0004-6361:20041437
Autor:
U. Heber, Ralf Napiwotzki, B. Voss, Horst Drechsel, M Altmann, Detlev Koester, C. A. Karl, O. Cordes, Roy Ostensen, S. Folkes, J. E. Solheim
Publikováno v:
Astronomy & Astrophysics. 420:251-264
We have discovered periodic light variations (P = 0.1718023 d) in the sdB star HS 2333+3927 in the BVR bands with amplitudes of 0.21, 0.28 and 0.33 mag, respectively. Sinusoidal radial velocity variations at the same period were detected with a semi-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d24202625b126065102f16219e150c76
https://doi.org/10.1051/0004-6361:20041043
https://doi.org/10.1051/0004-6361:20041043
Autor:
B. Voss, Ralf Napiwotzki, Horst Drechsel, U. Heber, O. Cordes, Roy Ostensen, Jan-Erik Solheim, C. A. Karl, M Altmann, Detlev Koester, S. Folkes
Publikováno v:
Astrophysics and Space Science. 291:283-289
We report the discovery of a binary, HS 2233 + 3927, consisting of an sdB star with a faint companion. From its lightcurve the orbital period of 14,844 s, the mass ratio, the inclination, and other system parameters are derived. The companion does no
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1e17f5600874ad2a720a22bf1b6fcf0c
https://doi.org/10.1023/b:astr.0000044334.98860.ab
https://doi.org/10.1023/b:astr.0000044334.98860.ab
Autor:
C. A. Karl, Norbert Christlieb, Dieter Reimers, Ralf Napiwotzki, D. Homeier, Gijs Nelemans, Ulrich Heber, T. Lisker
Publikováno v:
Astrophysics and Space Science. 291:321-328
We present the results of a radial velocity (RV) survey of 46 subdwarf B (sdB) and 23 helium-rich subdwarf O (He-sdO) stars. We detected 18 (39%) new sdB binary systems, but only one (4%) He-sdO binary. Orbital parameters of nine sdB and sdO binaries
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1901a330da67b0f36d4c457c3ac774a0
https://doi.org/10.1023/b:astr.0000044362.07416.6c
https://doi.org/10.1023/b:astr.0000044362.07416.6c
Autor:
Dieter Reimers, C. A. Karl, U. Heber, Norbert Christlieb, Gijs Nelemans, Detlev Koester, Ralf Napiwotzki
Publikováno v:
Astronomy & Astrophysics. 410:663-669
In the course of our search for double degenerate (DD) binaries as potential progenitors of type Ia supernovae with the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY) we discovered HE2209-1444 to be a double-lined system consist
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::05c19d60e375356489116fce92802e30
https://doi.org/10.1051/0004-6361:20031278
https://doi.org/10.1051/0004-6361:20031278
Akademický článek
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