Zobrazeno 1 - 10
of 133
pro vyhledávání: '"358"'
Autor:
Perez, J. M. Gonzalez, Metcalfe, T. S.
We present a new method that investigates the evolutionary history of the pulsating DB white dwarf GD358 using asteroseismology. This is done considering the internal C/O profile, which describes the relative abundances of carbon and oxygen from the
Externí odkaz:
http://arxiv.org/abs/0708.3703
Publikováno v:
2000, ApJ, 545, 974
White dwarf asteroseismology offers the opportunity to probe the structure and composition of stellar objects governed by relatively simple physical principles. The observational requirements of asteroseismology have been addressed by the development
Externí odkaz:
http://arxiv.org/abs/astro-ph/0008022
Publikováno v:
Astrophys.J.445:L141-L144,1995
Seismological observations with the Whole Earth Telescope (WET) allow the determination of the subsurface compositional structure of white dwarf stars. The hot DO PG 1159 has a helium surface layer with a mass of 0.001 Msun, while the cooler DB white
Externí odkaz:
http://arxiv.org/abs/astro-ph/9503099
Publikováno v:
Astrophys.J.661:1105-1111,2007
Two symbiotic stars in the Small Magellanic Cloud (SMC), Lin 358 and SMC 3, have been supersoft X-ray sources (SSS) for more than 10 years. We fit atmospheric and nebular models to their X-ray, optical and UV spectra obtained at different epochs. The
Externí odkaz:
http://arxiv.org/abs/astro-ph/0702419
Publikováno v:
Mon.Not.Roy.Astron.Soc. 344 (2003) L88
We investigate the global pulsation properties of DBV white dwarf models that include both the double-layered envelope structure expected from time-dependent diffusion calculations, as well as a non-uniform C/O core expected from prior nuclear burnin
Externí odkaz:
http://arxiv.org/abs/astro-ph/0306070
Autor:
Metcalfe, Travis S.
Publikováno v:
2001, PASP, 113, 1308 (Dissertation Summary)
White dwarf asteroseismology offers the opportunity to probe the structure and composition of stellar objects governed by relatively simple physical principles. The observational requirements of asteroseismology have been addressed by the development
Externí odkaz:
http://arxiv.org/abs/astro-ph/0106573
Publikováno v:
Astrophys.J.557:1021-1027,2001
For many years, astronomers have promised that the study of pulsating white dwarfs would ultimately lead to useful information about the physics of matter under extreme conditions of temperature and pressure. In this paper we finally make good on tha
Externí odkaz:
http://arxiv.org/abs/astro-ph/0104205
Autor:
Zalucha, A., Fitzsimmons, A., Elliot, J. L., Thomas-Osip, J., Hammel, H. B., Dhillon, V. S., Marsh, T. R., Taylor, F. W., Irwin, P. G. J.
Publikováno v:
Icarus192:503-518,2007
We observed a stellar occultation by Titan on 2003 November 14 from La Palma Observatory using ULTRACAM with three Sloan filters: u', g', and i' (358, 487, and 758 nm, respectively). The occultation probed latitudes 2 degrees S and 1 degrees N during
Externí odkaz:
http://arxiv.org/abs/0712.0834
Publikováno v:
2006, in Solar Polarization Workshop 4, eds. R. Casini and B. Lites, ASP Conf. Ser., vol. 358, p. 381-384
We report on the first ever detection of circular polarization in molecular lines forming in magnetic regions on the surfaces of active stars. The new observations were obtained with the high-resolution spectropolarimeter ESPaDOnS recently installed
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703560
Autor:
Carroll, T. A., Staude, J.
The characteristic size of penumbral structures are still below the current resolution limit of modern solar telescopes. Though we have seen a significant progress in theoretical work over the last decades no tight constraints can be placed on the si
Externí odkaz:
http://arxiv.org/abs/astro-ph/0703327