Results 21 to 30 of about 111,221 (213)

The High-energy Spectrum of the Young Planet Host V1298 Tau

The Astronomical Journal, 2023
V1298 Tau is a young pre-main-sequence star hosting four known exoplanets that are prime targets for transmission spectroscopy with current-generation instruments. This work pieces together observations from the NICER X-ray telescope, the Space Telescope
Girish M. Duvvuri, P. Wilson Cauley, Fernando Cruz Aguirre, Roy Kilgard, Kevin France, Zachory K. Berta-Thompson, J. Sebastian Pineda   +6 more
doaj   +1 more source

The Swift X-Ray Telescope

Space Science Reviews, 2005
The Swift Gamma-Ray Explorer is designed to make prompt multiwavelength observations of Gamma-Ray Bursts (GRBs) and GRB afterglows. The X-ray Telescope (XRT) enables Swift to determine GRB positions with a few arcseconds accuracy within 100 seconds of the burst onset.
Burrows, D. N., Hill, J. E., Nousek, J. A., Kennea, J. A., Wells, A., Osborne, J. P., Abbey, A. F., Beardmore, A., Mukerjee, K., Short, A. D. T., Chincarini, G., Campana, S., Citterio, O., Moretti, A., Pagani, C., Tagliaferri, G., Giommi, P., Capalbi, M., Tamburelli, F., Angelini, L., Cusumano, G., Brauninger, H. W., Burkert, W., Hartner, G. D.   +23 more
openaire   +4 more sources

The Spectrometer/Telescope for Imaging X-rays (STIX) [PDF]

Astronomy & Astrophysics, 2020
Aims. The Spectrometer Telescope for Imaging X-rays (STIX) on Solar Orbiter is a hard X-ray imaging spectrometer, which covers the energy range from 4 to 150 keV. STIX observes hard X-ray bremsstrahlung emissions from solar flares and therefore provides diagnostics of the hottest (⪆10 MK) flare plasma while quantifying the location, spectrum, and ...
M. Michalska, F. Schuller, Anna Maria Massone, Oliver Grimm, Oliver Grimm, Erica Lastufka, Erica Lastufka, F. Marone, Piotr Orleanski, J. Paschke, N. Hochmuth, Konrad Skup, A. Białek, Jana Kašparová, Lucia Kleint, L. Etesi, K. Ber, K. Lapadula, M. Woche, Ewan C. Dickson, Svend-Marian Bauer, S. Felix, H. Sathiapal, Astrid M. Veronig, Konrad Rutkowski, Federico Benvenuto, Janusz Sylwester, D. S. Bloomfield, D. S. Bloomfield, Alexander Warmuth, André Csillaghy, M. Darmetko, Brian R. Dennis, H. Xiao, R. A. Schwartz, R. A. Schwartz, R. A. Schwartz, Waldemar Bujwan, Marek Siarkowski, Shane A. Maloney, Shane A. Maloney, Paolo Massa, Martin Bednarzik, Andrzej Cichocki, Marina Battaglia, Ch. Wild, A. Meuris, S. Kögl, Frank Dionies, J. Rendtel, N. Vilmer, František Fárník, Sophie Musset, Sophie Musset, Karol Seweryn, D. Plüschke, O. Limousin, N. G. Arnold, G. Mann, H. J. Wiehl, G. Birrer, Peter T. Gallagher, Peter T. Gallagher, Säm Krucker, Säm Krucker, Robert P. Lin, F. Schramka, H. F. van Beek, S. Kobler, Marek Stęślicki, I. Le Mer, Piotr Osica, G. Juchnikowski, Tomasz Mrozek, Tomasz Mrozek, Michele Piana, J. Anderson, H. Önel, Arnold O. Benz, Z. Kozáček, Javier Rodriguez-Pacheco, F. Molendini, Milan Maksimovic, G. J. Hurford, G. J. Hurford, St. Stutz, Miroslaw Kowalinski, M. Winkler, O. Gevin, Piotr Podgorski, S. Brun, D. Schori, L. Iseli, Antoine Strugarek, M. Kuhar, M. Dreier, Simon Marcin, H.-P. Gröbelbauer, Diego Casadei, D. Ścisłowski   +99 more
openaire   +8 more sources

On the lithium abundance of the visual binary components ξ Boo A (G8V) and ξ Boo B (K5V)

Astronomische Nachrichten, Volume 343, Issue 9-10, November-December 2022., 2022
Abstract A spectroscopic investigation of the lithium resonance doublet in ξ Boo A and ξ Boo B in terms of both abundance and isotopic ratio is presented. We obtained new R = 130,000 spectra with a signal‐to‐noise ratio (S/N) per pixel of up to 3200 using the 11.8 m LBT and PEPSI.
Klaus G. Strassmeier, Matthias Steffen
wiley   +1 more source

Early optical observations of seven gamma-ray bursts in comparison to their gamma X-ray characteristics in the MSU MASTER Global Robotic Telescopes Net

Геодинамика и тектонофизика, 2019
Seven gamma-ray bursts – GRB 130907A, GRB 140311B, GRB 140129B, GRB 160227A, GRB 120404A, GRB 110801A, and GRB 120811C were observed by the MSU MASTER (Mobile Astronomical System of TElescope Robots) Global Network.
V. M. Lipunov, N. V. Tyurina, V. G. Kornilov, E. S. Gorbovskoy, V. V. Vladimirov, A. S. Kuznetzov, P. V. Balanutsa, D. S. Zimnukhov, V. V. Chazov, D. M. Vlasenko, A. G. Tlatov, V. A. Senik, O. A. Ershova, O. A. Gress, N. M. Budnev, S. A. Yazev, O. B. Chvalaev, V. A. Poleshchuk, Yu. V. Ishmuhametova, V. V. Yurkov, A. V. Gabovich, Yu. P. Sergienko, R. Podesta, C. Lopez, F. Podesta, H. Levato, R. R. Lopez, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andrez, D. Buckley   +31 more
doaj   +1 more source

A Focusing X-Ray Telescope Monochromator [PDF]

International Astronomical Union Colloquium, 1972
In order to resolve clusters of X-ray lines emitted by flares (Fritz et al, 1967; Neupert and Swartz, 1970) and to determine line shapes, a considerable resolving power is needed. The angular size of flares, typically about 2’ will not allow the necessary resolution to be obtained without a very fine slit system combined with the flat crystal X-ray ...
Benjamin S. Fraenkel, Aaron S. Filler
openaire   +2 more sources

Halo Emission of the Cat's Eye Nebula, NGC 6543 Shock Excitation by Fast Stellar Winds [PDF]

Journal of Astronomy and Space Sciences, 2002
Images taken with the Chandra X-ray telescope have for the the first time revealed the central, wind-driven, hot bubble (Chu et al. 2001), while Hubble Space Telescope (HST) WFPC2 images of the Cat's Eye nebula, NGC 6543, show that the temperature of the
Siek Hyung, Seong-Jae Lee
doaj   +1 more source

Exploring the frontiers of deep underground sciences and engineering—China Yunlong Lake Laboratory is striving to be the best

Deep Underground Science and Engineering, Volume 1, Issue 2, Page 131-137, December 2022., 2022
General plan of the in‐situ experiment (WNS) base. Abstract This paper introduces the establishment of deep underground infrastructure for science and engineering research. First, the representative deep underground research laboratories and facilities in the world and their functions were summarized and reviewed.
Lihua Hu, Jianguo Wang, Ali Karrech, Xiaozhao Li, Peng Zhao, Lulu Liu   +5 more
wiley   +1 more source

Technologies for advanced X-ray mirror fabrication [PDF]

, 2022
X-ray mirror fabrication for astronomy is challenging; this is due to the Wolter I optical geometry and the tight tolerances on roughness and form error to enable accurate and efficient X-ray reflection. The performance of an X-ray mirror, and ultimately that of the telescope, is linked to the processes and technologies used to create it.
arxiv   +1 more source

The VLBA-BU-BLAZAR Multi-Wavelength Monitoring Program

Galaxies, 2016
We describe a multiwavelength program of monitoring of a sample of bright γ-ray blazars, which the Boston University (BU) group has being carrying out since June 2007.
Svetlana Jorstad, Alan Marscher
doaj   +1 more source