Zobrazeno 1 - 10
of 96
pro vyhledávání: '"Brassard Pierre"'
Autor:
Charpinet Stephane, Giammichele Noemi, Zong Weikai, Van Grootel Valérie, Brassard Pierre, Fontaine Gilles
Publikováno v:
Open Astronomy, Vol 27, Iss 1, Pp 112-119 (2018)
An interesting opportunity offered by the detection of stellar oscillations is the possibility to infer the internal rotation rate of a star through the so-called rotational splittings. Such seismic measurements remained rather scarce for hot B subdw
Externí odkaz:
https://doaj.org/article/ca70b26ff9034ea088dfc1a724a99798
Autor:
Van Grootel Valérie, Péters Marie-Julie, Green Elizabeth M., Charpinet Stéphane, Brassard Pierre, Fontaine Gilles
Publikováno v:
Open Astronomy, Vol 27, Iss 1, Pp 44-56 (2018)
We present a new asteroseismic modeling of the hot B subdwarf (sdB) pulsator PG 1219+534, based on a 3- month campaign with the Mont4K/Kuiper combination at Mt Bigelow (Arizona) and on updated atmospheric parameters from high S/N low and medium resol
Externí odkaz:
https://doaj.org/article/a3f6eaf52aae42758a4ea0b9d919f99e
Publikováno v:
A&A 640, L11 (2020)
The continuous cooling of a white dwarf is punctuated by events that affect its cooling rate. Probably the most significant of those is the crystallization of its core, a phase transition that occurs once the C/O interior has cooled down below a crit
Externí odkaz:
http://arxiv.org/abs/2007.13669
Autor:
Fernandes, Catarina S., Van Grootel, Valerie, Salmon, Sebastien J. A. J., Aringer, Bernhard, Burgasser, Adam J., Scuflaire, Richard, Brassard, Pierre, Fontaine, Gilles
Ultracool dwarfs have emerged as key targets for searches of transiting exoplanets. Precise estimates of the host parameters (including mass, age, and radius) are fundamental to constrain the physical properties of orbiting exoplanets. We have extend
Externí odkaz:
http://arxiv.org/abs/1906.05626
Autor:
Van Grootel, Valerie, Randall, Suzanna K., Latour, Marilyn, Németh, Peter, Fontaine, Gilles, Brassard, Pierre, Charpinet, Stephane, Green, Elizabeth M.
Pulsating hot B subdwarf (sdB) stars, which are core-He burning objects, are one of the showcases of asteroseismology. Thanks to the combination of rich pulsation spectra and state-of-the-art modeling tools it is possible to tightly constrain fundame
Externí odkaz:
http://arxiv.org/abs/1905.00654
Autor:
Latour, Marilyn, Randall, Suzanna K., Fontaine, Gilles, Bono, Giuseppe, Calamida, Annalisa, Brassard, Pierre
Taking advantage of a recent FORS2/VLT spectroscopic sample of Extreme Horizontal Branch (EHB) stars in $\omega$ Cen, we isolate 38 spectra well suited for detailed atmospheric studies and determine their fundamental parameters ($T_{\rm eff}$, log $g
Externí odkaz:
http://arxiv.org/abs/1409.4042
Autor:
Van Grootel, Valerie, Charpinet, Stephane, Brassard, Pierre, Fontaine, Gilles, Green, Elizabeth M.
Context. Asteroseismic determinations of structural parameters of hot B subdwarfs (sdB) have been carried out for more than a decade now. These analyses rely on stellar models whose reliability for the required task needs to be evaluated critically.
Externí odkaz:
http://arxiv.org/abs/1303.3368
Autor:
Silvotti, Roberto, Randall, Suzanna, Dhillon, Vik S., Marsh, Tom R., Savoury, Chris D., Schuh, Sonja, Fontaine, Gilles, Brassard, Pierre
V391 Peg (HS2201+2610) is an extreme horizontal branch subdwarf B (sdB) star, it is an hybrid pulsator showing p- and g-mode oscillations, and hosts a 3.2/sini M_Jup planet at an orbital distance of about 1.7 AU. In order to improve the characterizat
Externí odkaz:
http://arxiv.org/abs/1005.2840
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Akademický článek
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