Results 51 to 60 of about 4,382,200 (272)

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

Baade's window and APOGEE. Metallicities, ages, and chemical abundances [PDF]

, 2017
Context. Baade's window (BW) is one of the most observed Galactic bulge fields in terms of chemical abundances. Owing to its low and homogeneous interstellar absorption it is considered the perfect calibration field for Galactic bulge studies. Aims.
M. Schultheis, Á. Rojas-Arriagada, A. P'erez, H. Jőnsson, M. Hayden, G. Nandakumar, K. Cunha, C. Prieto, J. Holtzman, T. Beers, D. Bizyaev, J. Brinkmann, R. Carrera, R. Cohen, D. Geisler, F. Hearty, J. G. Fern'andez-Trincado, C. Maraston, D. Minniti, C. Nitschelm, A. Roman-Lopes, D. Schneider, B. Tang, S. Villanova, G. Zasowski, S. Majewski   +25 more
semanticscholar   +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

Chemical Abundances of Planetary Nebulae in M33

, 2004
Using spectroscopic data presented in Magrini et al. (2003), we have analyzed with the photoionization code CLOUDY 94.00 (Ferland et al. 1998) 11 Planetary Nebulae belonging to the spiral galaxy M 33. Central star temperatures and nebular parameters have
A. Mampaso, Ambartsumian, Armsdorfer, Che, Corradi, Costa, Dufour, Exter, Ferland, Gurzadyan, Henry, Howard, Iben, Jacoby, Jacoby, Jacoby, Kingsburgh, L. Magrini, Leisy, M. Perinotto, Magrini, Mampaso, Maran, Morisset, Peimbert, Perinotto, Phillips, R. L. M. Corradi, Rauch, Richer, Stasinska, Vílchez, Walsh, Walsh   +33 more
core   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +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

Chemical Abundances of the S star GZ Peg [PDF]

, 2009
The chemical compositions of stars from the Asymptotic Giant Branch are still poorly known due to the low temperatures of their atmospheres and therefore the presence of many molecular transitions hampering the analysis of atomic lines.
Allen, Alonso, Goriely, Gustafsson, Jorissen, L. Pompéia, Lebzelter, Smiljanic, Woolf   +8 more
core   +1 more source

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, Lorenzo Monaco   +5 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

Elemental Abundances in the Diffuse Interstellar Medium from Joint Far-ultraviolet and X-Ray Spectroscopy: Iron, Oxygen, Carbon, and Sulfur

The Astronomical Journal
In this study, we investigate interstellar absorption lines along the line of sight toward the galactic low-mass X-ray binary Cygnus X-2. We combine absorption line data obtained from high-resolution X-ray spectra collected with the Chandra and XMM ...
I. Psaradaki, L. Corrales, J. Werk, A. G. Jensen, E. Costantini, M. Mehdipour, R. Cilley, N. Schulz, J. Kaastra, J. A. García, L. Valencic, T. Kallman, F. Paerels   +12 more
doaj   +1 more source