Zobrazeno 1 - 10
of 107
pro vyhledávání: '"Fontaine Gilles"'
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
Autor:
Tremblay, Pier-Emmanuel, Fontaine, Gilles, Fusillo, Nicola Pietro Gentile, Dunlap, Bart H., Gänsicke, Boris T., Hollands, Mark A., Hermes, J. J., Marsh, Thomas R., Cukanovaite, Elena, Cunningham, Tim
Publikováno v:
Nature, Volume 565, Issue 7738, 2019, p. 202-205
White dwarfs are stellar embers depleted of nuclear energy sources that cool over billions of years. These stars, which are supported by electron degeneracy pressure, reach densities of 1e7 grams per cubic centimetre in their cores. It has been predi
Externí odkaz:
http://arxiv.org/abs/1908.00370
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
We use Gaia DR2 kinematic data and white dwarf evolutionary models to determine that the young and ultramassive white dwarf GD 50 is a likely member of the AB Doradus moving group. Comparison with the Montr\'eal white dwarf evolutionary models and th
Externí odkaz:
http://arxiv.org/abs/1806.07512
In this research note we identify 130 new M-type candidate members of young associations with the BANYAN $\Sigma$ tool and recently published trigonometric distances from RECONS and URAT-South. We identify a white dwarf candidate in the AB Doradus mo
Externí odkaz:
http://arxiv.org/abs/1804.05248
We present a detailed spectroscopic analysis of 115 helium-line (DB) and 28 cool, He-rich hydrogen-line (DA) white dwarfs based on atmosphere fits to optical spectroscopy and photometry. We find that 63% of our DB population show hydrogen lines, maki
Externí odkaz:
http://arxiv.org/abs/1803.05965
We present a detailed spectroscopic and photometric analysis of 219 DA and DB white dwarfs for which trigonometric parallax measurements are available. Our aim is to compare the physical parameters derived from the spectroscopic and photometric techn
Externí odkaz:
http://arxiv.org/abs/1709.02324
We present an analysis of the evolutionary and pulsation properties of the extremely low-mass white dwarf precursor (B) component of the double-lined eclipsing system WASP 0247-25. Given that the fundamental parameters of that star have been obtained
Externí odkaz:
http://arxiv.org/abs/1708.09388