Results 71 to 80 of about 895,436 (365)

Stellar model atmospheres with abundance stratification [PDF]

Astronomy & Astrophysics, 2009
Context. Atomic diffusion is believed to be an important physical process in the atmospheres of several types of stars. Stellar atmospheres, including the stratification of the elements due to diffusion, are then needed to properly compare theoretical results to observations for such stars. Aims.
F. Leblanc, D. Monin, A. Hui-Bon-Hoa, P. H. Hauschildt   +3 more
openalex   +4 more sources

Observable Signatures of Planet Accretion in Red Giant Stars I: Rapid Rotation and Light Element Replenishment

, 2012
The orbital angular momentum of a close-orbiting giant planet can be sufficiently large that, if transferred to the envelope of the host star during the red giant branch (RGB) evolution, it can spin-up the star's rotation to unusually large speeds.
Alexander, Balachandran, Bard, Bard, Bizyaev, Blackwell, Blackwell, Blackwell, Blackwell, Blackwell, Blaise, Boothroyd, Busso, Butler, Böhm-Vitense, Carlberg, Carlberg, Carlberg, Carlberg, Carney, Castelli, Castilho, Chanamé, Charbonnel, Charbonnel, da Silva, Davis, de Medeiros, de Medeiros, Denissenkov, Denissenkov, Drake, Duquennoy, Eggleton, Frink, Fuhr, Fulbright, Ghezzi, Glebocki, Gratton, Griffin, Griffin, Hinkle, Houdashelt, Høg, Joleen K. Carlberg, Katia Cunha, Kumar, Kumar, Kurucz, Kurucz, Kurucz, Kurucz, Kurucz, Lodders, Majewski, Mandell, Massarotti, Mitchell, Mousis, Nordhaus, Palmerini, Paxton, Pilachowski, Piskunov, Raassen, Rabl, Raghavan, Reddy, Reddy, Ruchti, Sackmann, Sato, Schlegel, Shetrone, Smith, Smith, Sneden, Steven R. Majewski, Strassmeier, Uesugi, Verne V. Smith, Vogt, Wasserburg   +83 more
core   +1 more source

ASPCAP: THE APOGEE STELLAR PARAMETER AND CHEMICAL ABUNDANCES PIPELINE [PDF]

, 2015
The Apache Point Observatory Galactic Evolution Experiment (APOGEE) has built the largest moderately high-resolution (R ≈ 22,500) spectroscopic map of the stars across the Milky Way, and including dust-obscured areas.
A. G. García Pérez, C. Prieto, J. Holtzman, M. Shetrone, S. M'esz'aros, D. Bizyaev, R. Carrera, K. Cunha, D. A. Garc'ia-Hern'andez, Jennifer A. Johnson, S. Majewski, D. Nidever, R. Schiavon, N. Shane, V. Smith, J. Sobeck, N. Troup, O. Zamora, D. Weinberg, J. Bovy, D. Eisenstein, D. Feuillet, P. Frinchaboy, M. Hayden, F. Hearty, D. Nguyen, R. O’Connell, M. Pinsonneault, John C. Wilson, G. Zasowski   +29 more
semanticscholar   +1 more source

Mapping the evolution of mitochondrial complex I through structural variation

FEBS Letters, EarlyView.
Respiratory complex I (CI) is crucial for bioenergetic metabolism in many prokaryotes and eukaryotes. It is composed of a conserved set of core subunits and additional accessory subunits that vary depending on the organism. Here, we categorize CI subunits from available structures to map the evolution of CI across eukaryotes. Respiratory complex I (CI)
Dong‐Woo Shin, Tingting Chen, James A. Letts   +2 more
wiley   +1 more source

Detailed Chemical Abundance Analysis of the Brightest Stars in the Turranburra and Willka Yaku Stellar Streams

The Astrophysical Journal
We present a detailed chemical abundance analysis of the three brightest known stars from each of the Turranburra and Willka Yaku stellar streams using high-resolution Magellan/Magellan Inamori Kyocera Echelle spectra. Abundances for 27 elements, ranging
K. B. Webber, T. T. Hansen, J. L. Marshall, Alexander P. Ji, Ting S. Li, Gary S. Da Costa, Lara R. Cullinane, Denis Erkal, Sergey E. Koposov, Kyler Kuehn, Geraint F. Lewis, Dougal Mackey, Sarah L. Martell, Andrew B. Pace, Nora Shipp, Jeffrey D. Simpson, Zhen Wan, Daniel B. Zucker, Victor A. Alvarado, Joss Bland-Hawthorn, Guilherme Limberg, Gustavo E. Medina, Sam A. Usman   +22 more
doaj   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

A Systematic NLTE Study of Very Metal-poor Stars with Metallicity down to −4.3 dex. I. Global Stellar Parameters Based on High-resolution Spectra

The Astrophysical Journal
Very metal-poor (VMP) stars provide a record of the chemical composition and dynamics of the early Galaxy. Based on the high-resolution and high signal-to-noise ratio spectra from the Subaru Telescope for 103 VMP stars, in this series of papers we ...
Jianrong Shi, Gang Zhao, Shuai Liu, Zeming Zhou, Haining Li, Hongliang Yan, Sofya Alexeeva, Huawei Zhang, Wako Aoki, Tadafumi Matsuno, Jingkun Zhao, Huiling Chen, Yufu Shen   +12 more
doaj   +1 more source

Multiple Stellar Populations at Less Evolved Stages. III. A Possible Helium Spread in NGC 2210

The Astrophysical Journal, 2023
Helium variations are common features of globular clusters (GCs) with multiple stellar populations. All the formation scenarios predict that secondary population stars are enhanced in helium, but the exact helium content depends on the polluters ...
Chengyuan Li, Xin Ji, Long Wang, Yue Wang, Baitian Tang, Antonino P. Milone, Yujiao Yang, Holger Baumgardt, Dengkai Jiang   +8 more
doaj   +1 more source

Chemical consequences of low star formation rates: stochastically sampling the IMF

, 2008
When estimating the abundances which result from a given star formation event, it is customary to treat the IMF as a series of weight factors to be applied to the stellar yields, as a function of mass, implicitly assuming one is dealing with an infinite ...
Anders, Asplund, Carigi, Carigi, Carigi, Carigi, Carigi, Cerviño, Cerviño, Cerviño, Cescutti, Fenner, Geisler, Gilmore, Goodwin, Greggio, Greggio, Hernandez, Hirschi, Ikuta, Kniazev, Koeppen, Kroupa, Kroupa, L. Carigi, Lanfranchi, Lanfranchi, Maeder, Maeder, Maeder, Marcolini, Marigo, Marigo, Massey, Matteucci, McWilliam, Meynet, Pagel, Portinari, Sbordone, Shetrone, Shetrone, Thielemann, Tonry, van Zee, Venn, Weidner, Weidner, Woosley, X. Hernandez   +49 more
core   +1 more source

The Stellar Abundances for Galactic Archaeology (SAGA) data base - II. Implications for mixing and nucleosynthesis in extremely metal-poor stars and chemical enrichment of the Galaxy [PDF]

, 2010
We discuss the characteristics of known extremely metal-poor (EMP) stars in the Galaxy using the Stellar Abundances for Galactic Archaeology (SAGA) database (Suda et al. 2008, PASJ, 60, 1159).
T. Suda, S. Yamada, Y. Katsuta, Y. Komiya, C. Ishizuka, W. Aoki, M. Fujimoto   +6 more
semanticscholar   +1 more source