ar X iv : a st ro - p h / 05 06 30 1 v 1 1 4 Ju n 20 05 Spectroscopic classification of cataclysmic variable candidates 1

ar X iv : a st ro - p h / 05 06 38 2 v 1 1 6 Ju n 20 05 The disk vanishes

Recently published observations of VY Scl stars in their low, long-intermediate and high states confirm our model (Hameury & Lasota 2002) according to which accretion disks in such systems must vanish when their temperature corresponds to thermally unstable configurations. An observational confirmation of the hypothesis that the disk disappearance is caused by magnetic effects would have import...

ar X iv : a st ro - p h / 05 06 40 3 v 1 1 7 Ju n 20 05 Near - Infrared water lines in V 838 Monocerotis

V838 Monocerotis had an intriguing, nova-like outburst in January 2002 which has subsequently led to several studies of the object. It is now recognized that the outburst of V838 Mon and its evolution are different from that of a classical nova or other classes of well-known eruptive variables. V838 Mon, along with two other objects that have analogous properties, appears to comprise a new clas...

ar X iv : a st ro - p h / 04 06 56 7 v 1 2 4 Ju n 20 04 1

ar X iv : a st ro - p h / 05 06 26 1 v 1 1 3 Ju n 20 05 Laboratory simulation of cometary x rays using a high - resolution microcalorimeter

X-ray emission following charge exchange has been studied on the University of California Lawrence Livermore National Laboratory electron beam ion traps EBITI and EBIT-II using a high-resolution microcalorimeter. The measured spectra include the K-shell emission from hydrogenlike and heliumlike C, N, O, and Ne needed for simulations of cometary x-ray emission. A comparison of the spectra produc...

ar X iv : a st ro - p h / 05 06 44 9 v 4 1 9 Ju n 20 06 Can a dust dominated universe have accelerated expansion ?

Recently, there has been suggestions that the apparent accelerated expansion of the universe is due not to a cosmological constant, but rather to inhomogeneities in the distribution of matter. In this work, we investigate a specific class of inhomogeneous models that can be solved analytically, namely the dust-dominated Lemâitre-Tolman-Bondi universe models. We show that they do not permit acce...