Results 41 to 50 of about 4,372,191 (364)

Chemical abundances and radial velocities in the extremely metal-poor galaxy DDO 68 [PDF]

Monthly notices of the Royal Astronomical Society, 2018
We present chemical abundances and radial velocities of six HII regions in the extremely metal-poor star-forming dwarf galaxy DDO 68. They are derived from deep spectra in the wavelength range 3500 - 10,000 {\AA}, acquired with the Multi Object Double ...
F. Annibali, V. L. Torre, M. Tosi, C. Nipoti, F. Cusano, A. Aloisi, M. Bellazzini, L. Ciotti, A. Marchetti, M. Mignoli, D. Romano, E. S. I. D. A. E. S. Spazio, Bologna, Italy, D. Astronomia, U. Bologna, Space Telescope Science Institute, Baltimore., Usa, I. D. F. Cosmica, Milano   +20 more
semanticscholar   +1 more source

Chemical Abundances of Main-sequence, Turnoff, Subgiant, and Red Giant Stars from APOGEE Spectra. I. Signatures of Diffusion in the Open Cluster M67 [PDF]

, 2018
Detailed chemical abundance distributions for 14 elements are derived for eight high-probability stellar members of the solar metallicity old open cluster M67 with an age of ∼4 Gyr.
D. Souto, K. Cunha, V. Smith, C. Prieto, C. Prieto, D. A. García-Hernández, D. A. García-Hernández, M. Pinsonneault, Parker H. Holzer, P. Frinchaboy, J. Holtzman, J. A. Johnson, H. Jönsson, S. Majewski, M. Shetrone, J. Sobeck, G. Stringfellow, J. Teske, O. Zamora, O. Zamora, G. Zasowski, R. Carrera, K. Stassun, J. Fernández-Trincado, J. Fernández-Trincado, S. Villanova, D. Minniti, F. Santana   +27 more
semanticscholar   +1 more source

High-resolution Chemical Abundances of the Nyx Stream

The Astrophysical Journal, 2023
Nyx is a nearby, prograde, and high-eccentricity stellar stream physically contained in the thick disk, but its origin is unknown. Nyx could be the remnant of a disrupted dwarf galaxy, in which case the associated dark matter substructure could affect ...
Shuyu Wang, Lina Necib, Alexander P. Ji, Xiaowei Ou, Mariangela Lisanti, Mithi A. C. de los Reyes, Allison L. Strom, Mimi Truong   +7 more
doaj   +1 more source

Neon and Sulfur Abundances of Planetary Nebulae in the Magellanic Clouds [PDF]

, 2007
The chemical abundances of neon and sulfur for 25 planetary nebulae (PNe) in the Magellanic Clouds are presented. These abundances have been derived using mainly infrared data from the Spitzer Space Telescope.
Aller L. H., de Graauw T., Feldman U., Fluks M. A., Grevesse N., J. Bernard‐Salas, J. R. Houck, Monk D. J., P. W. Morris, Pena M., S. Gutenkunst, S. R. Pottasch, Zijlstra A. A.   +12 more
core   +4 more sources

Chemical abundances of 1111 FGK stars from the HARPS GTO planet search program. II. Cu, Zn, Sr, Y, Zr, Ba, Ce, Nd, and Eu [PDF]

, 2017
To understand the formation and evolution of the different stellar populations within our Galaxy it is essential to combine detailed kinematical and chemical information for large samples of stars.
E. D. Mena, M. Tsantaki, V. Adibekyan, S. Sousa, N. Santos, J. Hern'andez, G. Israelian   +6 more
semanticscholar   +1 more source

Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO [PDF]

Astronomy & Astrophysics, 2018
Context. Detailed chemical abundances of Galactic stars are needed in order to improve our knowledge of the formation and evolution of our galaxy, the Milky Way. Aims.
E. Caffau, P. Bonifacio, E. Oliva, S. Korotin, L. Capitanio, S. Andrievsky, S. Andrievsky, R. Collet, L. Sbordone, S. Duffau, N. Sanna, A. Tozzi, L. Origlia, N. Ryde, H. Ludwig   +14 more
semanticscholar   +1 more source

Constraining cosmic scatter in the Galactic halo through a differential analysis of metal-poor stars [PDF]

, 2017
© ESO 2017.Context. The chemical abundances of metal-poor halo stars are important to understanding key aspects of Galactic formation and evolution. Aims.
Amanda Karakas, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Andrievsky, Aoki, Aoki, Arnone, Asplund, Asplund, Audouze, Baumueller, Baumueller, Bensby, Bergemann, Bergemann, Biazzo, Boesgaard, Bonifacio, Bonifacio, Busso, Busso, Carlos, Caughlan, Cayrel, Cescutti, Chiaki Kobayashi, Chiappini, Chieffi, Civitarese, Coc, Coc, Coc, Cohen, Cowan, Cyburt, Eggen, Ferraro, Ferraro, Fishlock, François, Frischknecht, Fu, Gustafsson, Hampel, Hannaford, Hansen, Hartog, Heger, Henrique Reggiani, Herwig, Hollek, Hou, Iocco, Jacobson, Ji, Jorge Meléndez, Karakas, Karakas, Keller, Kim, Kobayashi, Kobayashi, Kobayashi, Kohri, Lai, Lawler, Lind, Lind, Liu, Liu, Maeda, McCrea, McWilliam, Meléndez, Meléndez, Meléndez, Meléndez, Meyer, Meynet, Monroe, Nissen, Nissen, Nissen, Nomoto, Norris, Norris, O’Malley, Pignatari, Placco, Placco, Placco, Pllumbi, Ramírez, Ramírez, Ramírez, Ramírez, Ramírez, Ramírez, Reggiani, Richard, Roederer, Ryan, Ryan, Ryan, Salvati, Santucci, Scholz, Schuster, Searle, Shigeyama, Sills, Sitnova, Sneden, Spina, Spite, Spite, Spite, Suda, Suda, Thielemann, Tucci Maia, Tucci Maia, Umeda, Vinicius Placco, Wood, Yamada, Yi, Yong, Zhao, Önehag   +131 more
core   +3 more sources

Li-rich Giants Identified from LAMOST DR8 Low-resolution Survey

The Astronomical Journal, 2023
A small fraction of giants possess photospheric lithium (Li) abundance higher than the value predicted by the standard stellar evolution models, and the detailed mechanisms of Li enhancement are complicated and lack a definite conclusion.
Beichen Cai, Xiaoming Kong, Jianrong Shi, Qi Gao, Yude Bu, Zhenping Yi   +5 more
doaj   +1 more source

Chemical Abundances of Hydrostatic and Explosive Alpha-elements in Sagittarius Stream Stars [PDF]

, 2018
We analyze chemical abundances of stars in the Sagittarius (Sgr) tidal stream using high-resolution Gemini+GRACES spectra of 42 members of the highest surface-brightness portions of both the trailing and leading arms.
J. Carlin, Allyson A. Sheffield, K. Cunha, V. Smith   +3 more
semanticscholar   +1 more source

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