Results 11 to 20 of about 178,075 (291)
X-ray astronomy of stellar coronae [PDF]
The Astronomy and Astrophysics Review, 2004 X-ray emission from stars in the cool half of the Hertzsprung-Russell diagram is generally attributed to the presence of a magnetic corona that contains plasma at temperatures exceeding 1 million K. Coronae are ubiquitous among these stars, yet many fundamental mechanisms operating in their magnetic fields still elude an interpretation through a ...
exaly +5 more sources
The Astrophysical Journal, 2023 We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur +3 more
doaj +1 more source
Hadronic gamma-ray emission from windy microquasars [PDF]
, 2003 The jets of microquasars with high-mass stellar companions are exposed to the dense matter field of the stellar wind. We present estimates of the gamma-ray emission expected from the jet-wind hadronic interaction and we discuss the detectability of the ...
Aharonian +36 more
core +2 more sources
Lithium in Turnoff Stars in the Globular Cluster M5: A Quest for Primordial Lithium
The Astrophysical Journal, 2023 The light element lithium is formed by nucleosynthesis during the Big Bang. Its abundance can help to define the parameters of the early Universe. To find this primordial value, it is necessary to determine Li abundances in the oldest stars because it is
Ann Merchant Boesgaard +1 more
doaj +1 more source
Galaxies, 2021 Radio astronomy commenced in earnest after World War II, with Australia keenly engaged through the Council for Scientific and Industrial Research. At this juncture, Australia’s Commonwealth Solar Observatory expanded its portfolio from primarily studying
Alister W. Graham +4 more
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Modeling The Nucleosynthesis Of Massive Stars [PDF]
, 2003 This overview discusses issues relevant to modeling nucleosynthesis in type II supernovae and implications of detailed studies of the ejecta. After a brief presentation of the most common approaches to stellar evolution and parameterized explosions, the ...
Arnett +16 more
core +3 more sources
Meter- to Millimeter Emission from Cool Stellar Systems : Latest Results, Synergies Across the Spectrum, and Outlook for the Next Decade [PDF]
, 2018 Splinter session summary, to appear in the proceedings of the 20th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (ed. S. J. Wolk)Radio observations of cool stellar systems provide unique information on their magnetic fields, high-energy ...
Berger, Edo +14 more
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The γ Dor stars as revealed by Kepler: A key to reveal deep-layer rotation in A and F stars
EPJ Web of Conferences, 2017 The γ Dor pulsating stars present high-order gravity modes, which make them important targets in the intermediate-and low-mass main-sequence region of the Hertzsprung-Russell diagram. Whilst we have only access to rotation in the envelope of the Sun, the
Salmon S. J. A. J. +4 more
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ASCA view on High-Redshift Radio-Quiet Quasars [PDF]
, 2000 We briefly discuss the latest ASCA results on the X-ray spectral properties of high-redshift radio-quiet quasars.Comment: 4 pages, 1 figure, to appear in the Proceedings of the Conference "X-ray Astronomy '999: Stellar Endpoints, AGNs, and the Diffuse ...
Cappi, M. +4 more
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Coronal activity with XMM-Newton and Chandra
, 2008 XMM-Newton and Chandra have greatly deepened our knowledge of stellar coronae giving access to a variety of new diagnostics such that nowadays a review of stellar X-ray astronomy necessarily must focus on a few selected topics.
B. Stelzer, Eric Stempels
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