Zobrazeno 1 - 10
of 41
pro vyhledávání: '"Evans, T. Lloyd"'
Autor:
Matsuura, Mikako, Bernard-Salas, Jeronimo, Evans, T. Lloyd, Volk, Kevin M., Hrivnak, Bruce J., Sloan, G. C., Chu, You-Hua, Gruendl, Robert, Kraemer, Kathleen E., Peeters, Els, Szczerba, R., Wood, P. R., Zijlstra, Albert A., Hony, S., Ita, Yoshifusa, Kamath, Devika, Lagadec, Eric, Parker, Quentin A, Reid, Warren A., Shimonishi, Takashi, Van Winckel, H., Woods, Paul M., Kemper, F., Meixner, Margaret, Otsuka, M., Sahai, R., Sargent, B. A., Hora, J. L., McDonald, Iain
This paper reports variations of polycyclic aromatic hydrocarbons (PAHs) features that were found in Spitzer Space Telescope spectra of carbon-rich post-asymptotic giant branch (post-AGB) stars in the Large Magellanic Cloud (LMC). The paper consists
Externí odkaz:
http://arxiv.org/abs/1401.0728
Autor:
Gielen, C., Bouwman, J., Van Winckel, H., Evans, T. Lloyd, Woods, P. M., Kemper, F., Marengo, M., Meixner, M., Sloan, G. C., Tielens, A. G. G. M.
Aims. In this paper we study the Spitzer and TIMMI2 infrared spectra of post-AGB disc sources, both in the Galaxy and the LMC. Using the observed infrared spectra we determine the mineralogy and dust parameters of the discs, and look for possible dif
Externí odkaz:
http://arxiv.org/abs/1108.0796
The detected variety in chemistry and circumstellar shell morphology of the limited sample of Galactic post-AGB stars is so large that there is no consensus yet on how the different objects are linked by evolutionary channels. The evaluation is compl
Externí odkaz:
http://arxiv.org/abs/1104.2254
Autor:
Gielen, C., Van Winckel, H., Min, M., Waters, L. B. F. M., Evans, T. Lloyd, Matsuura, M., Deroo, P., Dominik, C., Reyniers, M., Zijlstra, A., Gordon, K. D., Kemper, F., Indebetouw, R., Marengo, M., Meixner, M., Sloan, G. C., Tielens, A. G. G. M., Woods, P. M.
Publikováno v:
Astronomy and Astrophysics, 2010, Volume 515, id.C2
Recently, we have discovered an error in our Monte-Carlo spectral fitting routine, more specifically where the errors on the fluxes were rescaled to get a reduced chi2 of 1. The rescaled errors were too big, resulting in too wide a range of good fits
Externí odkaz:
http://arxiv.org/abs/1006.3229
Autor:
Gielen, C., Van Winckel, H., Reyniers, M., Zijlstra, A., Evans, T. Lloyd, Gordon, K. D., Kemper, F., Indebetouw, R., Marengo, M., Matsuura, M., Meixner, M., Sloan, G. C., Tielens, A. G. G. M., Woods, P. M.
Aims: By studying the photospheric abundances of 4 RV Tauri stars in the LMC, we test whether the depletion pattern of refractory elements, seen in similar Galactic sources, is also common for extragalactic sources. Since this depletion process proba
Externí odkaz:
http://arxiv.org/abs/0910.5624
Aims: We investigate the mineralogy and dust processing in the circumbinary discs of binary post-AGB stars using high-resolution TIMMI2 and SPITZER infrared spectra. Methods: We perform a full spectral fitting to the infrared spectra using the most r
Externí odkaz:
http://arxiv.org/abs/0809.2505
Autor:
Reyniers, M., Abia, C., Van Winckel, H., Evans, T. Lloyd, Decin, L., Eriksson, K., Pollard, K. R.
Publikováno v:
Astron.Astrophys. 461 (2007) 641-650
Context. Abundance analysis of post-AGB objects as probes of AGB nucleosynthesis. Aims. A detailed photospheric abundance study is performed on the carbon-rich post-AGB candidate MACHO47.2496.8 in the LMC. Methods. High-resolution, high signal-to-noi
Externí odkaz:
http://arxiv.org/abs/astro-ph/0610240
Publikováno v:
Astron.Astrophys.448:641-653,2006
Aims: We aim at showing that the broad-band SED characteristics of our sample of post-AGB stars are best interpreted, assuming the circumstellar dust is stored in Keplerian rotating passive discs. Methods: We present a homogeneous and systematic stud
Externí odkaz:
http://arxiv.org/abs/astro-ph/0601578
Publikováno v:
Astron.Astrophys. 429 (2005) 297
We present a chemical abundance analysis on the basis of high signal-to- noise and high resolution spectra for 12 stars of our newly defined sample. The selection criterion for the stars of this sample was their position in the `RV Tauri' box in the
Externí odkaz:
http://arxiv.org/abs/astro-ph/0501469
Autor:
Maas, T., Van Winckel, H., Evans, T. Lloyd, Nyman, L. -A., Kilkenny, D., Martinez, P., Marang, F., van Wyk, F.
Publikováno v:
Astron.Astrophys.405:271-284,2003
We present an analysis of our extensive data-set on IRAS 08544-4431. It is the first object we discuss of our newly defined sample of stars, selected for their position in the 'RV Tauri' box in the IRAS [12]-[25], [25]-[60] two-color diagram. Moreove
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306492