Výsledky vyhledávání - "C. A. Hummel"

Seismic modelling of the pulsating mercury–manganese star HD 29589

Autor: E Niemczura, P Walczak, P Mikołajczyk, M Schöller, C A Hummel, S Hubrig, T Różański

Publikováno v: Monthly Notices of the Royal Astronomical Society. 514:5640-5658

Photometric and spectroscopic time-series of chemically peculiar mercury–manganese (HgMn) stars show variability, which in most cases is interpreted as the effect of binarity or surface spots. Until recently, pulsations have not been detected in th

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::33dca9824cd0e6fecd92f4a5c643b1f6
https://doi.org/10.1093/mnras/stac1632

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Trumpler 16-26: A New Centrifugal Magnetosphere Discovered via SDSS/APOGEE H-band Spectroscopy

Autor: S Drew Chojnowski, Swetlana Hubrig, Jonathan Labadie-Bartz, Thomas Rivinius, Markus Schöller, Ewa Niemczura, David L Nidever, Amelia M Stutz, C A Hummel

We report the discovery of a new example of the rare class of highly magnetized, rapidly rotating, helium enhanced, early B stars that produce anomalously wide hydrogen emission due to a centrifugal magnetosphere (CM). The star is Trumpler 16-26, a B

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::665b17b8568da42ca11bca1135f5a02f
http://arxiv.org/abs/2208.12722

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The outer orbit of the high-mass stellar triple system Herschel 36 determined with the VLTI

Autor: J Sanchez-Bermudez, C A Hummel, J Díaz-López, A Alberdi, R Schödel, J I Arias, R H Barbá, E Bastida-Escamilla, W Brandner, J Maíz Apellániz, J-U Pott

Publikováno v: Digital.CSIC. Repositorio Institucional del CSIC
instname

Multiplicity is a ubiquitous characteristic of massive stars. Multiple systems offer us a unique observational constraint on the formation of high-mass systems. Herschel 36 A is a massive triple system composed of a close binary (Ab1-Ab2) and an oute

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b9e4dfc5c6d88f1028121126bf147b51
http://hdl.handle.net/10261/278894

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Detection of anomalous element distribution in the extremely slowly rotating magnetic O9.7 V star HD 54879

Autor: S P Järvinen, S Hubrig, M Schöller, A Cikota, I Ilyin, C A Hummel, M Küker

The O9.7 V star HD 54879 is currently the only massive magnetic star whose magnetic field geometry and rotation period are not constrained. Over the last three years, we gathered additional observations of this star, obtained using various instrument

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3bc9b8ff90cc79d554c4e5a5d7695da1
http://arxiv.org/abs/2112.14362

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Surveying the Bright Stars by Optical Interferometry III: A Magnitude-Limited Multiplicity Survey of Classical Be-Stars

Autor: D. J. Hutter, C. Tycner, R. T. Zavala, J. A. Benson, C. A. Hummel, H. Zirm

We present the results of a multiplicity survey for a magnitude-limited sample of 31 classical Be stars conducted with the Navy Precision Optical Interferometer and the Mark III Stellar Interferometer. The interferometric observations were used to de

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::59b4b3581eeff0b9a2a639f73068547c
http://arxiv.org/abs/2109.06839

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VLTI-MATISSE chromatic aperture-synthesis imaging of η Carinae's stellar wind across the Brα line: Periastron passage observations in February 2020

Autor: Th. Rivinius, C. M. P. Russell, A. Domiciano de Souza, Uwe Beckmann, Lucas Labadie, F. Allouche, P. Cruzalèbes, Sylvie Robbe-Dubois, Antoine Mérand, William C. Danchi, A. F. J. Moffat, Kenji Hamaguchi, Michael F. Corcoran, József Varga, Alexis Matter, Thomas I. Madura, Stephane Lagarde, Sebastian Wolf, Anthony Meilland, Walter Jaffe, Paul Bristow, T. R. Gull, Felix Bettonvil, D. A. Espinoza-Galeas, Jose H. Groh, J. C. Augereau, Carsten Dominik, W. J. de Wit, Markus Schöller, J. Leftley, V. Hocdé, Uwe Graser, R. van Boekel, F. Navarete, L. Klarmann, K. Ohnaka, Leonard Burtscher, Th. Henning, Karl-Heinz Hofmann, Augusto Damineli, Ian R. Stevens, C. Connot, Klaus Meisenheimer, Stefan Kraus, Patrick W. Morris, G. Yoffe, Michiel R. Hogerheijde, Romain Petrov, Ph. Berio, M. Heininger, Henrik Hartman, J. W. Isbell, Markus Wittkowski, Eric Pantin, E. Kokoulina, J. Drevon, Julien Woillez, L. B. F. M. Waters, E. Nußbaum, Dieter Schertl, Bruno Lopez, Alexander Kreplin, Gerd Weigelt, Florentin Millour, D. J. Hillier, J. Hron, M. Lehmitz, V. Gámez Rosas, J. Sanchez-Bermudez, Noel D. Richardson, C. A. Hummel, Claudia Paladini, Andrea Mehner, Farrokh Vakili, Andreas Glindemann, P. Antonelli, C. Leinert, Gérard Zins, Philippe Stee

Publikováno v: Astronomy & Astrophysics, 652:A140. EDP Sciences
Astronomy & Astrophysics, 652
Astronomy & Astrophysics, 652, 1-22
Astronomy & Astrophysics, 652, pp. 1-22

Context. Eta Carinae is a highly eccentric, massive binary system (semimajor axis ~15.5 au) with powerful stellar winds and a phase-dependent wind-wind collision (WWC) zone. The primary star, η Car A, is a luminous blue variable (LBV); the secondary

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d06daaf6607db2ea8e3aee0292014bdb
https://dare.uva.nl/personal/pure/en/publications/vltimatisse-chromatic-aperturesynthesis-imaging-of--carinaes-stellar-wind-across-the-br-line(1b2ef33d-ecf6-411a-8241-108b7aa6f984).html

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First MATISSE L-band observations of HD 179218

Autor: Dieter Schertl, Th. Henning, Gerd Weigelt, Florentin Millour, József Varga, Stephane Lagarde, J. Hron, Walter Jaffe, J. Leftley, Karl-Heinz Hofmann, L. Klarmann, G. Yoffe, A. Soulain, M. Heininger, V. Hocdé, Marco Delbo, Felix C. M. Bettonvil, Paul Bristow, Anthony Meilland, Uwe Beckmann, F. Allouche, A. Bensberg, M. Lehmitz, J. C. Augereau, C. A. Hummel, Lucas Labadie, Gérard Zins, Philippe Berio, Uwe Graser, Farrokh Vakili, P. Antonelli, Markus Wittkowski, Pierre Cruzalèbes, Nathalie Ysard, C. Leinert, Carsten Dominik, L. B. F. M. Waters, Claudia Paladini, Isabelle Percheron, J. Duprat, Anthony P. Jones, Michiel R. Hogerheijde, E. Habart, Sylvie Robbe-Dubois, J. W. Isbell, Eric Pantin, R. van Boekel, Klaus Meisenheimer, Julien Woillez, Bruno Lopez, Alexis Matter, Péter Ábrahám, E. Kokoulina, Romain Petrov, V. Gámez Rosas, Emmanuel Dartois, Ph. Stee, Sebastian Wolf, J. Drevon, M. Dannhoff, William C. Danchi

Publikováno v: Astronomy and Astrophysics-A&A
Astronomy and Astrophysics-A&A, EDP Sciences, 2021, 652, pp.A61. ⟨10.1051/0004-6361/202141175⟩
Astronomy & Astrophysics, 652, 1-22
Astronomy & Astrophysics, 652:A61. EDP Sciences
Astronomy & Astrophysics, 652
Astronomy & Astrophysics, 652, pp. 1-22
HAL

Context. Carbon is one of the most abundant components in the Universe. While silicates have been the main focus of solid phase studies in protoplanetary discs (PPDs), little is known about the solid carbon content especially in the planet-forming re

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c1923ba545dd48ac29be2ec3e6e40ad8
https://doi.org/10.1051/0004-6361/202141175

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The very slow rotation of the magnetic O9.7 V star HD 54879

Autor: Markus Schöller, Swetlana Hubrig, C. A. Hummel, Silva P. Järvinen

Publikováno v: Monthly Notices of the Royal Astronomical Society. 491:281-288

The first FORS2 spectropolarimetric observation of the longitudinal magnetic field of HD54879 of the order of -600G with a lower limit of the dipole strength of ~2kG dates back to 2014. Since then observations showed a gradual decrease of the absolut

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::71a6f52d5b597a578f9d403810c43be1
https://doi.org/10.1093/mnras/stz3046

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The effect of transfer line length and heat rejection temperature distribution on the Thales linear pulse tube (LPT) cryocoolers

Autor: I M McKinley, C D Hummel, J I Rodriguez

Publikováno v: IOP Conference Series: Materials Science and Engineering. 1240:012021

Four Thales LPT9310 and four Thales LPT9510 commercial off-the-shelf (COTS) cryocoolers were parametrically performance tested. The LPT9310 coolers had transfer lines of various lengths while the LPT9510 coolers all had the same transfer line geometr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::00d7c259d144081173b0323c3b4ce41a
https://doi.org/10.1088/1757-899x/1240/1/012021

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Potential Detection of Secular Evolution of Chemical Abundances on the Surface of the HgMn Primary in the Triple System χ Lup

Autor: J. F. González, S. P. Järvinen, H. Korhonen, C. A. Hummel, I. V. Ilyin, R.-D. Scholz, S D Chojnowski, M. Schöller, S. Hubrig

Publikováno v: CONICET Digital (CONICET)
Consejo Nacional de Investigaciones Científicas y Técnicas
instacron:CONICET

Se dectriben las detecciones en: HgMn Primary in the Triple System χ Lup realizadas con instrumentos del CASLEO. Fil: Järvinen, Silva. Leibniz Institute For Astrophysics Potsdam; Alemania Fil: Chojnowski, Drew. New Mexico State University.; Estados

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::92a9acacece58a790b011b37ad781b2c
https://iopscience.iop.org/article/10.3847/2515-5172/ab6bd2

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