Zobrazeno 1 - 10
of 16
pro vyhledávání: '"Bertolami, Marcelo Miguel Miller"'
Autor:
Dixon, William V., Chayer, Pierre, Bertolami, Marcelo Miguel Miller, Fiscella, Valentina Sosa, Benjamin, Robert A., Dupree, Andrea
The Bright Star in the globular cluster 47 Tucanae (NGC 104) is a post-AGB star of spectral type B8 III. The ultraviolet spectra of late-B stars exhibit a myriad of absorption features, many due to species unobservable from the ground. The Bright Sta
Externí odkaz:
http://arxiv.org/abs/2108.01641
The transition from the asymptotic giant branch (AGB) to the final white dwarf (WD) stage is arguably the least understood phase in the evolution of single low- and intermediate-mass stars ($0.8 \lesssim M_{\rm ZAMS}/M_\odot\lesssim 8...10$). Here we
Externí odkaz:
http://arxiv.org/abs/1910.01013
We have analyzed FUSE, COS, GHRS, and Keck HIRES spectra of the UV-bright star Barnard 29 in M13 (NGC 6205). By comparing the photospheric abundances derived from multiple ionization states of C, N, O, Si, and S, we infer an effective temperature T_e
Externí odkaz:
http://arxiv.org/abs/1903.00350
Autor:
Dixon, William V., Chayer, Pierre, Latour, Marilyn, Bertolami, Marcelo Miguel Miller, Benjamin, Robert A.
We present a spectral analysis of the UV-bright star Y453 in M4. Model fits to the star's optical spectrum yield T_eff ~ 56,000 K. Fits to the star's FUV spectrum, obtained with the Cosmic Origins Spectrograph (COS) on board the Hubble Space Telescop
Externí odkaz:
http://arxiv.org/abs/1708.01315
Autor:
Battich, Tiara, Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Bertolami, Marcelo Miguel Miller
The Peccei-Quinn mechanism proposed to solve the CP problem of Quantum Chromodynamics has as consequence the existence of axions, hypothetical weakly interacting particles whose mass is constrained to be on the sub-eV range. If these particles exist
Externí odkaz:
http://arxiv.org/abs/1605.07668
Recent determinations of the white dwarf luminosity function (WDLF) from very large surveys have extended our knowledge of the WDLF to very high luminosities. This, together with the availability of new full evolutionary white dwarf models that are r
Externí odkaz:
http://arxiv.org/abs/1407.1404
Akademický článek
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Akademický článek
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Autor:
Córsico, Alejandro Hugo, Althaus, Leandro Gabriel, Kawaler, Steven D., Bertolami, Marcelo Miguel Miller, García-Berro, Enrique, Kepler, Souza Oliveira
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We put asteroseismological constraints on the internal rotation profile of theGWVir (PG1159- type) star PG 0122+200. To this end we employ a state-of-the-art asteroseismological model for this star and assess the expected frequency splittings induced
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::89b698904a860958cff9d52c569b23cf
Autor:
Althaus, Leandro Gabriel, Panei, Jorge Alejandro, Bertolami, Marcelo Miguel Miller, García-Berro, Enrique, Córsico, Alejandro Hugo, Romero, Alejandra Daniela, Kepler, Souza Oliveira, Rohrmann, R. D.
Publikováno v:
Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS
We present full evolutionary calculations appropriate for the study of hot hydrogen-deficient DO white dwarfs, PG 1159 stars, and DB white dwarfs. White dwarf sequences are computed for a wide range of stellar masses and helium envelopes on the basis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______3056::07d70dbe128942ce95a52d3cc3ee7c4e