Results 11 to 20 of about 562,012 (337)

Red giant seismology: Observations [PDF]

EPJ Web of Conferences, 2013
The CoRoT and Kepler missions provide us with thousands of red-giant light curves that allow a very precise asteroseismic study of these objects. Before CoRoT and Kepler, the red-giant oscillation patterns remained obscure.
Mosser B.
doaj   +3 more sources

Theoretical Uncertainties in Red Giant Branch Evolution: The Red Giant Branch Bump [PDF]

The Astrophysical Journal, 2005
A Monte Carlo simulation exploring uncertainties in standard stellar evolution theory on the red giant branch of metal-poor globular clusters has been conducted.
Alongi M., Brian Chaboyer, Cassisi S., Cassisi S., Castellani V., Fusi Pecci F., Raffelt G. G., Salpeter E. E., Singh H. P., Stephan R. Bjork, Sweigart A. V., Weiss A.   +11 more
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Asteroseismology of red giants & galactic archaeology [PDF]

, 2017
Red-giant stars are low- to intermediate-mass ($M \lesssim 10$~M$_{\odot}$) stars that have exhausted hydrogen in the core. These extended, cool and hence red stars are key targets for stellar evolution studies as well as galactic studies for several ...
A. Baglin, A. Datta, A. Helmi, A. Miglio, B. Mosser, B. Mosser, B. Mosser, B. Mosser, B. Paxton, C. Aerts, C. Allende Prieto, C. Chiappini, D. Kawata, D. Stello, D. Yong, D.R. Soderblom, E. Böhm-Vitense, E. Guggenberger, E.P. Bellinger, G.C. Angelou, G.R. Ricker, H. Kjeldsen, H. Lamb, H. Rauer, H.-W. Rix, I. Minchev, I. Minchev, J. Bland-Hawthorn, J. Bovy, J. Christensen-Dalsgaard, J. Christensen-Dalsgaard, J. Kumamoto, J. Lattanzio, K. Belkacem, K. Freeman, K. Schwarzschild, L. Girardi, L. Lindegren, M. Bergemann, M. Gabriel, M. Martig, M. Martig, M. Ness, M. Ness, M. Ness, M. Tassoul, M.A.C. Perryman, M.R. Merrifield, N. Gai, N. Langer, O. Creevey, P. Gaulme, P. Goldreich, P. Goldreich, P. Jofré, P. Ledoux, R. Kippenhahn, R. Trampedach, R.K. Ulrich, S. Hekker, S. Hekker, S. Refsdal, S. Sharma, S.B. Howell, S.R. Loebman, T. Constantino, T. Kallinger, T.M. Brown, T.R. Bedding, T.R. White, V.M. Canuto, W.J. Borucki, W.J. Chaplin   +72 more
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A Red Giants’ Toy Story

The Astrophysical Journal, 2022
Abstract In spite of the spectacular progress accomplished by stellar evolution theory, some simple questions remain unanswered. One of these questions is “Why do stars become red giants?”. Here we present a relatively simple analytical answer to this question.
M. M. Miller Bertolami
openalex   +3 more sources

The Aarhus red giants challenge [PDF]

Astronomy & Astrophysics, 2020
Contact. The large quantity of high-quality asteroseismic data that have been obtained from space-based photometric missions and the accuracy of the resulting frequencies motivate a careful consideration of the accuracy of computed oscillation frequencies of stellar models, when applied as diagnostics of the model properties. Aims.
Christensen-Dalsgaard, Jørgen, Christensen-Dalsgaard, Jørgen, Silva Aguirre, Víctor, Silva Aguirre, Víctor, Miller Bertolami, Marcelo M., Miller Bertolami, Marcelo M., Serenelli, A., Serenelli, A., Stello, Dennis, Stello, Dennis, Weiss, A., Weiss, A., Angelou, George, Angelou, George, Jiang, Chen, Jiang, Chen, Lebreton, Yveline, Lebreton, Yveline, Spada, Federico, Spada, Federico, Bellinger, E. P., Bellinger, E. P., Deheuvels, Sébastien, Deheuvels, Sébastien, Ouazzani, R.-M., Ouazzani, R.-M., Pietrinferni, A., Pietrinferni, A., Mosumgaard, Jakob R., Mosumgaard, Jakob R., Townsend, Richard H. D., Townsend, Richard H. D., Battich, Tiara, Bossini, Diego, Constantino, Thomas N., Eggenberger, P., Hekker, Saskia, Mazumdar, A., Miglio, Andrea, Nielsen, K. B., Salaris, M.   +40 more
openaire   +19 more sources

Variable Red Giants [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe longest-known class of pulsating variable stars, namely pulsating red giants, is also the one that involves the most complex physical processes. Pulsation, mass loss, nuclear synthesis, mixing, atmospheric and circumstellar chemistry and dust formation all interrelate with one another and make both the observational studies and the ...
Franz Kerschbaum, Walter Nowotny
openaire   +1 more source

Gamma-ray flares from red giant/jet interactions in AGN [PDF]

, 2010
Non-blazar AGN have been recently established as a class of gamma-ray sources. M87, a nearby representative of this class, show fast TeV variability on timescales of a few days. We suggest a scenario of flare gamma-ray emission in non-blazar AGN based on
Abdo, Acciari, Aharonian, Albert, Araudo, Ayal, Bednarek, Berestetskii, Beskin, Bisnovatyi-Kogan, Bisnovatyi-Kogan, Blandford, Chandrasekhar, Dar, Diener, Felix A. Aharonian, Gebhardt, Ghisellini, Gregori, Hicken, Imshennik, Kaplan, Liang, Mannheim, Maxim V. Barkov, Nakamura, Neronov, Owen, Penston, Pittard, Schopper, Shakura, Shakura, Valentí Bosch-Ramon   +33 more
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Metallicities of Globular Clusters m3 and m5 from VI CCD Photometry [PDF]

Journal of Astronomy and Space Sciences, 2000
To derive the metallicities of M3 and M5, we used the shape of red giant branch, horizontal branch magnitude, and red giant branch bump on the (V - I) - V color magnitude diagrams.
Young-Jong Sohn, Hyun-Chul Lee
doaj   +2 more sources

Влияние на микоризни гъби върху растежните прояви при различни черешови сортове в района на Кюстендил

Растениевъдни науки, 2023
Проследено е влиянието на арбускуларните микоризни гъби в ЕО тора Dynocarb MYC върху растежа на 16 новоинтродуцирани за района на Кюстендил черешови сорта – Primulat, Early Lorry, Sweet Lorry, Lorry Bloom, Big Lorry, Giant Red, Firm Red, Giorgia, Folfer,
Вилина Петрова, Симеон Крумов   +1 more
doaj   +1 more source

Carbon-deficient Red Giants [PDF]

The Astrophysical Journal, 2019
Abstract Carbon-deficient red giants (CDRGs) are a rare class of peculiar red giants, also called “weak G-band” or “weak CH” stars. Their atmospheric compositions show depleted carbon, a low isotopic ratio, and an overabundance of nitrogen, indicating that the material at ...
openaire   +2 more sources