Zobrazeno 1 - 10
of 193
pro vyhledávání: '"WALKER, G. A. H."'
Autor:
Tkachenko, A., Matthews, J. M., Aerts, C., Pavlovski, K., Papics, P. I., Zwintz, K., Cameron, C., Walker, G. A. H., Kuschnig, R., Degroote, P., Debosscher, J., Moravveji, E., Kolbas, V., Guenther, D. B., Moffat, A. F. J., Rowe, J. F., Rucinski, S. M., Sasselov, D., Weiss, W. W.
Binary stars provide a valuable test of stellar structure and evolution, because the masses of the individual stellar components can be derived with high accuracy and in a model-independent way. In this work, we study Spica, an eccentric double-lined
Externí odkaz:
http://arxiv.org/abs/1601.08069
Autor:
Hatzes, A. P., Cochran, W. D., Endl, M., Guenther, E. W., MacQueen, P., Hartmann, M., Zechmeister, M., Han, I., Lee, B. -C., Walker, G. A. H., Yang, S., Larson, A. M., Kim, K. -M., Mkrtichian, D. E., Doellinger, M., Simon, A. E., Girardi, L.
We investigate the nature of the long-period radial velocity variations in Alpha Tau first reported over 20 years ago. We analyzed precise stellar radial velocity measurements for Alpha Tau spanning over 30 years. An examination of the Halpha and Ca
Externí odkaz:
http://arxiv.org/abs/1505.03454
Autor:
Sódor, Á., Chené, A. -N., De Cat, P., Bognár, Zs., Wright, D. J., Marois, C., Walker, G. A. H., Matthews, J. M., Kallinger, T., Rowe, J. F., Kuschnig, R., Guenther, D. B., Moffat, A. F. J., Rucinski, S. M., Sasselov, D., Weiss, W. W.
Publikováno v:
A&A 568, A106 (2014)
Context: The central star of the HR 8799 system is a gamma Doradus-type pulsator. The system harbours four planetary-mass companions detected by direct imaging, and is a good solar system analogue. The masses of the companions are not known accuratel
Externí odkaz:
http://arxiv.org/abs/1407.0267
Autor:
Hatzes, A. P., Zechmeister, M., Matthews, J., Kuschnig, R., Walker, G. A. H., Doellinger, M., Guenther, D. B., Moffat, A. F. J., Rucinski, S. M., Sasselov, D.
We use precise radial velocity measurements and photometric data to derive the frequency spacing of the p-mode oscillation spectrum of the planet-hosting star Beta Gem. This spacing along with the interferometric radius for this star is used to deriv
Externí odkaz:
http://arxiv.org/abs/1205.5889
Autor:
Maier, J. P., Walker, G. A. H., Bohlender, D. A., Mazzotti, F. J., Raghunandan, R., Fulara, J., Garkusha, I., Nagy, A.
We present strong evidence that the broad, diffuse interstellar bands (DIBs) at 4881 and 5450\,\AA are caused by the $B\,^1$B$_1$\,$\leftarrow$\,$X\,^1$A$_1$ transition of H$_2$CCC (l-C$_3$H$_2$). The large widths of the bands are due to the short li
Externí odkaz:
http://arxiv.org/abs/1011.0401
Autor:
Linnartz, H., Wehres, N., Van Winckel, H., Walker, G. A. H., Bohlender, D. A., Tielens, A. G. G. M, Motylewski, T., Maier, J. P.
The aim of this work is to link the broad lambda 5450 diffuse interstellar band (DIB) to a laboratory spectrum recorded through an expanding acetylene plasma. Cavity ring-down direct absorption spectra and astronomical observations of HD 183143 with
Externí odkaz:
http://arxiv.org/abs/1002.1231
Autor:
Huber, D., Matthews, J. M., Croll, B., Obbrugger, M., Gruberbauer, M., Guenther, D. B., Weiss, W. W., Rowe, J. F., Kallinger, T., Kuschnig, R., Scholtz, A. L., Moffat, A. F. J., Rucinski, S., Sasselov, D., Walker, G. A. H.
Context: Asteroseismology has great potential for the study of metal-poor stars due to its sensitivity to determine stellar ages. Aims: Our goal was to detect p-mode oscillations in the metal-poor sub-dwarf 85 Peg A and to search for other variabilit
Externí odkaz:
http://arxiv.org/abs/0907.1929
Autor:
Fares, R., Donati, J. -F., Moutou, C., Bohlender, D., Catala, C., Deleuil, M., Shkolnik, E., Cameron, A. C., Jardine, M. M., Walker, G. A. H.
In this paper, we present new spectropolarimetric observations of the planet-hosting star Tau Bootis, using ESPaDOnS and Narval spectropolarimeters at Canada-France-Hawaii Telescope (CFHT) and Telescope Bernard Lyot (TBL), respectively. We detected t
Externí odkaz:
http://arxiv.org/abs/0906.4515
Autor:
Zwintz, K., Kallinger, T., Guenther, D. B., Gruberbauer, M., Huber, D., Rowe, J., Kuschnig, R., Weiss, W. W., Matthews, J. M., Moffat, A. F. J., Rucinski, S. M., Sasselov, D., Walker, G. A. H., Casey, M. P.
We present precise photometry of the pulsating Herbig Ae star HD 142666 obtained in two consecutive years with the MOST (Microvariability & Oscilations of STars) satellite. Previously, only a single pulsation period was known for HD 142666. The MOST
Externí odkaz:
http://arxiv.org/abs/0812.1960