Výsledky vyhledávání - "Barnes, Thomas G."

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New systemic radial velocities of suspected RR Lyrae binary stars

Autor: Guggenberger, Elisabeth, Barnes, Thomas G., Kolenberg, Katrien

Among the tens of thousands of known RR Lyrae stars there are only a handful that show indications of possible binarity. The question why this is the case is still unsolved, and has recently sparked several studies dedicated to the search for additio

Externí odkaz: http://arxiv.org/abs/1512.00873

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Cepheid distances from the Baade-Wesselink method

Autor: Gieren, Wolfgang, Storm, Jesper, Nardetto, Nicolas, Gallenne, Alexandre, Pietrzyński, Grzegorz, Fouqué, Pascal, Barnes, Thomas G., Majaess, Daniel

Recent progress on Baade-Wesselink (BW)-type techniques to determine the distances to classical Cepheids is reviewed. Particular emphasis is placed on the near-infrared surface-brightness (IRSB) version of the BW method. Its most recent calibration i

Externí odkaz: http://arxiv.org/abs/1210.7150

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Distance Scale Zero-Points from Galactic RR Lyrae Star Parallaxes

Autor: Benedict, G. Fritz, McArthur, Barbara E., Feast, Michael W., Barnes, Thomas G., Harrison, Thomas E., Bean, Jacob L., Menzies, John W., Chaboyer, Brian, Fossati, Luca, Nesvacil, Nicole, Smith, Horace A., Kolenberg, Katrien, Laney, C. D., Kochukhov, Oleg, Nelan, Edmund P., Shulyak, D. V., Taylor, Denise, Freedman, Wendy L.

We present new absolute trigonometric parallaxes and proper motions for seven Pop II variable stars: five RR Lyr variables; RZ Cep, XZ Cyg, SU Dra, RR Lyr, UV Oct; and two type 2 Cepheids; VY Pyx and {\kappa} Pav. We obtained these results with astro

Externí odkaz: http://arxiv.org/abs/1109.5631

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An In-Depth Spectroscopic Analysis of the Blazhko Star RR Lyr. I. Characterisation of the star: abundance analysis and fundamental parameters

Autor: Kolenberg, Katrien, Fossati, Luca, Shulyak, Denis, Pikall, Holger, Barnes, Thomas G., Kochukhov, Oleg, Tsymbal, Vadim

The knowledge of accurate stellar parameters is a keystone in several fields of stellar astrophysics, such as asteroseismology and stellar evolution. Although the fundamental parameters can be derived both from spectroscopy and multicolour photometry

Externí odkaz: http://arxiv.org/abs/1004.5156

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Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations

Autor: Benedict, G. Fritz, McArthur, Barbara E., Feast, Michael W., Barnes, Thomas G., Harrison, Thomas E., Patterson, Richard J., Menzies, John W., Bean, Jacob L., Freedman, Wendy L.

Publikováno v: Astron.J.133:1810-1827,2007; Erratum-ibid.133:2980,2007

(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF Aql, T Vul, and RT Aur. We obtain these results with astrometric data

Externí odkaz: http://arxiv.org/abs/astro-ph/0612465

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