Zobrazeno 1 - 10
of 161
pro vyhledávání: '"C B, Pereira"'
Publikováno v:
The Astrophysical Journal, Vol 971, Iss 2, p 152 (2024)
Weak G -band stars (WGBs) are a unique class of objects characterized by weak CH molecular lines in the Fraunhofer G band, indicative of a deficiency in ^12 C. This peculiar spectral feature is often accompanied by significant enrichments in N and, o
Externí odkaz:
https://doaj.org/article/b8c1e9edcf09422f9dc89535ff55ed4b
Autor:
M. P. Roriz, N. Holanda, L. V. da Conceição, S. Junqueira, N. A. Drake, A. Sonally, C. B. Pereira
Publikováno v:
The Astronomical Journal, Vol 167, Iss 4, p 184 (2024)
A classical local thermodynamic equilibrium analysis, based on high-resolution spectroscopic data, is performed for a sample of three potential barium dwarf candidates and one star already recognized as such. We derived their atmospheric parameters,
Externí odkaz:
https://doaj.org/article/da1edba8a2cc46a69d559fc9adeec28f
Publikováno v:
Revista Brasileira de Ensino de Física, Vol 43 (2021)
Este trabalho teve como finalidade a construção de um luxímetro utilizando um fotodetector/conversor luz em frequência (LTF, do inglês “light to frequency”) e plataforma Arduino. As etapas de execução consistiram no desenvolvimento do cód
Externí odkaz:
https://doaj.org/article/50262f6c62bf459ab74a3324247a2743
Autor:
F Quispe-Huaynasi, F Roig, S Daflon, C B Pereira, V M Placco, F Jiménez-Esteban, F J Galindo-Guil, A Alvarez-Candal, J Alcaniz, R E Angulo, J Cenarro, D Cristóbal-Hornillos, R Dupke, A Ederoclite, C Hernández-Monteagudo, C López-Sanjuan, A Marín-Franch, M Moles, L Sodré, J Varela, H Vázquez Ramió
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 522:3898-3911
High-velocity stars in the Milky Way are related to extreme astrophysical phenomena. In this work, we characterize 28 stars with Galactocentric velocities higher than 400 $\mathrm{km\, s^{-1}}$ observed in the Javalambre Photometric Local Universe Su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::20a47b22949685ed5b15d89a6a5086c7
https://doi.org/10.1093/mnras/stad1230
https://doi.org/10.1093/mnras/stad1230
Autor:
Daniel M. Girardi, Mariana A. de Lima, Gabriel C. B. Pereira, Marcelo V. Negrão, Rossana V. M. López, Fernanda C. Capareli, Jorge Sabbaga, Paulo Marcelo G. Hoff
Publikováno v:
BMC Cancer, Vol 18, Iss 1, Pp 1-7 (2018)
Abstract Background Treatment of localized gastric cancer (LGC) consists of surgical resection followed by adjuvant treatment. Both chemoradiation (CRT) and chemotherapy (CT) regimens have shown benefit in survival outcomes versus observation. Howeve
Externí odkaz:
https://doaj.org/article/76bb3fdc7ade44489835116eec73b541
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 518:5414-5443
We present detailed chemical compositions of four stars on the first-ascent red giant branch that are classified as chemically peculiar, but lack comprehensive analyses at high spectral resolution. For BD+03{\deg}2688, HE 0457-1805, HE 1255-2324, and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4c754abd1cb7bdd1f1753f7984a1b98d
https://doi.org/10.1093/mnras/stac3378
https://doi.org/10.1093/mnras/stac3378
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 518:4038-4044
The origin of the so-called weak G-band stars constitutes an unsolved problem in stellar astrophysics. In this context, we present a detailed abundance analysis of a new weak G-band star, HD 16424, which stands out with a very low 12C/13C ratio and L
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::847d48d6701c9ba4a16297f1232132ea
https://doi.org/10.1093/mnras/stac3343
https://doi.org/10.1093/mnras/stac3343
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 516:4484-4496
In this study, we undertake a comprehensive investigation of seven red giant stars of NGC 4349 (#005, #009, #079, #127, #168, #174, and #203) and one non-member star (#053). Accurate abundances of 19 chemical species and 12C/13C isotopic ratio are de
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08f34d1914091853e4637c0ebc589e16
https://doi.org/10.1093/mnras/stac2496
https://doi.org/10.1093/mnras/stac2496
Autor:
M. A. Pogodin, S. E. Pavlovskii, N. G. Beskrovnaya, N. A. Drake, O. V. Kozlova, I. Yu. Alekseev, M. Borges Fenandes, C. B. Pereira, G. G. Valyavin, A. S. Miroshnichenko, S Yu. Gorda, D. L. Gorshanov
Publikováno v:
Astrophysics. 65:31-52
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0d0b20de014203f176195d7a4461bc2b
https://doi.org/10.1007/s10511-022-09720-8
https://doi.org/10.1007/s10511-022-09720-8
Autor:
F. A. Ferreira, Natalia A. Drake, Laura Magrini, J. R. P. da Silva, F. F. S. Maia, N. Holanda, W. J. B. Corradi, C. B. Pereira
Publikováno v:
Monthly Notices of the Royal Astronomical Society. 508:5786-5801
We present the results of a chemical analysis of fast and anomalous rotator giants members of the young open cluster NGC 6124. For this purpose, we carried out abundances of the mixing sensitive species such as Li, C, N, Na, and 12C/13C isotopic rati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a55670d326dd595a14c38c99ef7b8e50
https://doi.org/10.1093/mnras/stab2836
https://doi.org/10.1093/mnras/stab2836