Results 61 to 70 of about 4,473,250 (366)

Chemical abundances in the nucleus of the Sagittarius dwarf spheroidal galaxy [PDF]

, 2017
We present Iron, Magnesium, Calcium, and Titanium abundances for 235 stars in the central region of the Sagittarius dwarf spheroidal galaxy (within 9.0 arcmin ~70 pc from the center) from medium-resolution Keck/DEIMOS spectra.
A. Mucciarelli, M. Bellazzini, R. Ibata, D. Romano, S. Chapman, L. Monaco   +5 more
semanticscholar   +1 more source

Chemical Abundances in Field Red Giants from High-Resolution H-Band Spectra using the APOGEE Spectral Linelist

, 2012
High-resolution H-band spectra of five bright field K, M, and MS giants, obtained from the archives of the Kitt Peak National Observatory (KPNO) Fourier Transform Spectrometer (FTS), are analyzed to determine chemical abundances of 16 elements.
Bizyaev, Dmitry, Cunha, Katia, Holtzman, Jon, Johnson, Jennifer A., Majewski, Steven R., Meszaros, Szabolcs, Perez, Ana Garcia, Prieto, Carlos Allende, Schiavon, Ricardo, Shetrone, Matthew D., Smith, Verne V.   +10 more
core   +1 more source

Chemical sensitivity to the ratio of the cosmic-ray ionization rates of He and H2 in dense clouds [PDF]

, 2006
Aim: To determine whether or not gas-phase chemical models with homogeneous and time-independent physical conditions explain the many observed molecular abundances in astrophysical sources, it is crucial to estimate the uncertainties in the calculated ...
Baldwin, Bergin, Boger, Charnley, Dalgarno, E. Herbst, F. Selsis, G. Massacrier, Glassgold, Graedel, Herbst, Le Bourlot, Le Bourlot, Le Teuff, Lee, Pagani, Pineau des Forets, Shalabiea, Smith, Snell, Terzieva, V. Wakelam, Wakelam, Wakelam, Wakelam   +24 more
core   +3 more sources

A volume-limited survey of mCP stars within 100 pc – I. Fundamental parameters and chemical abundances [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We present the first results of a volume-limited survey of main sequence (MS) magnetic chemically peculiar (mCP) stars. The sample consists of all identified intermediate-mass MS stars (mCP and non-mCP) within a heliocentric distance of $100\,{\rm pc ...
J. Sikora, J. Sikora, G. Wade, J. Power, J. Power, C. Neiner   +5 more
semanticscholar   +1 more source

TOPoS. IV. Chemical abundances from high-resolution observations of seven extremely metal-poor stars [PDF]

, 2018
Context. Extremely metal-poor (EMP) stars provide us with indirect information on the first generations of massive stars. The TOPoS survey has been designed to increase the census of these stars and to provide a chemical inventory that is as detailed as ...
P. Bonifacio, E. Caffau, M. Spite, F. Spite, L. Sbordone, L. Monaco, P. François, P. François, B. Plez, P. Molaro, A. Gallagher, A. Gallagher, R. Cayrel, N. Christlieb, R. Klessen, Andreas Koch, Andreas Koch, H. Ludwig, H. Ludwig, M. Steffen, M. Steffen, S. Zaggia, C. Abate   +22 more
semanticscholar   +1 more source

Chemical abundances of LINER galaxies – nitrogen abundance estimations

Monthly Notices of the Royal Astronomical Society
ABSTRACT In this work, we investigated the nitrogen and oxygen abundances in a sample of galaxies with Low Ionization Nuclear Emission Regions (LINERs) in their nucleus. Optical spectroscopic data (3600 – 10 000 Å) of 40 LINERs from the Mapping Nearby Galaxies (MaNGAs) survey were considered.
C B Oliveira, Â. C. Krabbe, O. L. Dors, I. A. Zinchenko, J. A. Hernández-Jiménez, M. V. Cardaci, G. F. Hägele, Gabriele S Ilha   +7 more
openaire   +3 more sources

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

Evolution of chemical abundances in Seyfert galaxies

, 2007
We computed the chemical evolution of spiral bulges hosting Seyfert nuclei, based on updated chemical and spectro-photometrical evolution models for the bulge of our Galaxy, made predictions about other quantities measured in Seyferts, and modeled the ...
Adams, Angeletti, Arimoto, Balcells, Baldwin, Ballero, Ballero, Ballero, Barth, Bentz, Bertin, Blain, Bondi, Brandt, Calura, Calura, Calura, Calura, Chiappini, Chiappini, Cimatti, Cioffi, Ciotti, Ciotti, Ciotti, Collin, Cox, Cox, D'Odorico, Di Matteo, Dietrich, Dietrich, Dunlop, Dwek, F. Calura, F. Matteucci, Fabian, Ferrarese, Ferrarese, Fields, Fields, Ford, François, Fraquelli, Freudling, Friaça, Fulbright, Fulbright, Galaz, Gebhardt, Gebhardt, Genzel, González Delgado, Granato, Groenewegen, Gu, Haiman, Hamann, Hamann, Hamann, Hernquist, Ho, Ho, Häring, Itoh, Iwamuro, Iwamuro, Jiang, Jimenez, Jimenez, Kaspi, Komossa, Kormendy, Kurucz, L. Ciotti, Laor, Launhardt, Lecureur, Lee, MacKenty, Magorrian, Maiolino, Maiolino, Marconi, Markowitz, Mathur, Matteucci, Matteucci, Matteucci, Matteucci, Matteucci, Matteucci, McLure, Monaco, Nagao, Nagao, Narayan, Nelson, Nomoto, Onken, Origlia, Origlia, Origlia, Ostriker, P. Padovani, Padovani, Peletier, Peletier, Petitjean, Pipino, Rich, Rodríguez-Ardila, Romano, S. K. Ballero, Salpeter, Sazonov, Scannapieco, Schmitt, Shields, Storchi-Bergmann, Storchi-Bergmann, Storchi-Bergmann, Storchi-Bergmann, Thomas, Thomas, Thompson, Tinsley, Tremaine, Turner, Ulrich, Van Loon, Verner, Wandel, Wandel, Wang, Warner, Wills, Wu, Yee, Yu, Zoccali, Zoccali   +141 more
core   +2 more sources

Properties of six short-period massive binaries: a study of the effects of binarity on surface chemical abundances [PDF]

, 2017
A significant fraction of massive stars are found in multiple systems. The effect of binarity on stellar evolution is poorly constrained. In particular, the role of tides and mass transfer on surface chemical abundances is not constrained observationally.
F. Martins, L. Mahy, Anthony Herv'e Lupm, CNRSMontpellier University, S. Sciences, Technologies, A. R. Institute, L. University, Instituut voor Sterrenkunde, K. Leuven   +9 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