The GRAVITY fringe tracker

Autor: Christian Straubmeier, Oliver Pfuhl, Elodie Choquet, Wolfgang Brandner, Xavier Haubois, P. Fédou, Roderick Dembet, Sylvestre Lacour, Guy Perrin, Burkhard Wolff, Julien Woillez, Karine Perraut, A. Ramirez, António Amorim, Konrad R. W. Tristram, Ekkehard Wieprecht, Roberto Abuter, Frédéric Cassaing, T. Ott, Erich Wiezorrek, Frank Eisenhauer

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2019, 624, pp.A99. ⟨10.1051/0004-6361/201834981⟩
Astronomy and Astrophysics
Astronomy & Astrophysics
Astronomy and Astrophysics-A&A, 2019, 624, pp.A99. ⟨10.1051/0004-6361/201834981⟩

The GRAVITY instrument has been commissioned on the VLTI during 2016 and is now available to the astronomical community. It is the first optical interferometer capable of observing sources as faint as magnitude 19 in K-band. This is possible thanks t

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::abb6987d13e15a73010127f0ba42aecf
https://hal.sorbonne-universite.fr/hal-02113844/file/aa34981-18.pdf

GRAVITY chromatic imaging of η Car's core. Milliarcsecond resolution imaging of the wind-wind collision zone (Brγ, He I)

Autor: S. Kellner, Pierre Kervella, Faustine Cantalloube, Johana Panduro, Magdalena Lippa, V. Coudé du Foresto, Y. Clénet, R. Abuter, G. Avila, Matteo Accardo, Konrad R. W. Tristram, Dan Popovic, Alejandra Rosales, A. Buron, R. Genzel, C. Deen, Laurent Jocou, Markus Schöller, T. Ott, H. Bonnet, P. Fédou, Frank Eisenhauer, R. van Boekel, Stefan Hippler, André Müller, Pierre Léna, Thibaut Moulin, Julien Woillez, L. Pallanca, Ekkehard Wieprecht, P.-O. Petrucci, N. Hubin, Leander Mehrgan, Sylvestre Lacour, Markus Wittkowski, Vincent Lapeyrere, Christian A. Hummel, M. Haug, Eckhard Sturm, Frederic Derie, Thanh Phan Duc, Sarah Kendrew, Burkhard Wolff, Mario Kiekebusch, Nicolas Blind, Andreas Kaufer, W. J. de Wit, Feng Gao, C. Collin, Silvia Scheithauer, L. Kern, Roderick Dembet, Matthew Horrobin, J.-U. Pott, Stefan Gillessen, Johann Kolb, Narsireddy Anugu, R.-R. Rohloff, M. Riquelme, J. Sanchez-Bermudez, Andreas Eckart, J. Moreno-Ventas, R. Brast, Z. Hubert, Isabelle Percheron, M. Mellein, F. Delplancke-Ströbele, M. Karl, Udo Neumann, Imke Wank, Rainer Lenzen, Odele Straub, Michael Esselborn, Armin Huber, J.-B. Le Bouquin, Ralf Klein, Juan-Luis Ramos, Erich Wiezorrek, Samuel Lévêque, K. Perraut, Frédéric Cassaing, C. E. Garcia Dabo, F. Müller, P. M. Plewa, Ewald Müller, N. Ventura, F. Chapron, Gerd Weigelt, M. Ebert, Martin Kulas, M. Wiest, Elodie Choquet, Luca Pasquini, A. Caratti o Garatti, A. Pflüger, T. de Zeeuw, Guy Perrin, Myriam Benisty, Yves Magnard, Joachim M. Bestenlehner, S. Oberti, António Amorim, Nicolas Schuhler, B. Lazareff, Paulo J. V. Garcia, Jason Dexter, Christian Straubmeier, Th. Henning, Jason Spyromilio, F. H. Vincent, A. Mérand, Senol Yazici, Felix Widmann, C. Rau, Pierre Bourget, R. J. García López, Xavier Haubois, Eric Gendron, Gérard Zins, G. Rousset, Andres J. Ramirez, Gilles Duvert, T. Paumard, Lieselotte Jochum, Idel Waisberg, F. Haussmann, O. Pfuhl, Sebastian Rabien, G. Rodríguez-Coira, Gerd Jakob, J. P. Berger, Wolfgang Brandner, D. Ziegler, Marcos Suarez

Publikováno v: Astronomy and Astrophysics, 618, A125

Context. η Car is one of the most intriguing luminous blue variables in the Galaxy. Observations and models of the X-ray, ultraviolet, optical, and infrared emission suggest a central binary in a highly eccentric orbit with a 5.54 yr period residing

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dbf1026b460a873ee87272f7110219dd
http://hdl.handle.net/1887/70609

Recent studies of magnetic fields in Herbig Ae/Be stars

Autor: Beate Stelzer, R. V. Yudin, Zdeněk Mikulášek, Swetlana Hubrig, Burkhard Wolff, Ilya Ilyin, M. A. Pogodin, Markus Schöller, Charles R. Cowley

Publikováno v: Astronomische Nachrichten. 332:1022-1026

New determinations of the mean longitudinal magnetic field for several Herbig Ae/Be stars are presented. The longitudinal magnetic field measurements of MWC 480 reveal the presence of a strong kG field, which was undetected in our previous low-resolu

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39aecd096588d28fc92a2f9246bf917b
https://doi.org/10.1002/asna.201111607

Heavy calcium in CP stars

Autor: Swetlana Hubrig, Charles R. Cowley, J. F. González, Burkhard Wolff, Fiorella Castelli

Publikováno v: Monthly Notices of the Royal Astronomical Society. 377:1579-1587

Large wavelength shifts of infrared triplet lines of Ca II have been observed in the spectra of HgMn and magnetic Ap stars. They have been attributed to the heavy calcium isotopes, including Ca-48. One member of the triplet, $\lambda$8542, had been e

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99dcb6fe6273a39bd465992e2b8ede91
https://doi.org/10.1111/j.1365-2966.2007.11719.x

Detection of an extraordinarily large magnetic field in the unique ultra-cool Ap star HD 154708

Autor: Margarida S. Cunha, Gautier Mathys, Pierre North, Nicole Nesvacil, Swetlana Hubrig, D. W. Kurtz, Markus Schöller, Burkhard Wolff, V. G. Elkin, Thomas Szeifert

Publikováno v: Astronomy & Astrophysics. 440:L37-L40

We have discovered an extraordinarily large mean longitudinal magnetic field of 7.5 kG in the ultra-cool low mass Ap star HD 154708 using FORS 1 in spectropolarimetric mode. From UVES spectra, we have measured a mean magnetic field modulus of 24.5 kG

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d123c3e02277b7f64dacec9b3b046b80
https://doi.org/10.1051/0004-6361:200500164