ar X iv : a st ro - p h / 04 01 55 8 v 1 2 6 Ja n 20 04 Cepheids and Long Period Variables in NGC 4395

ar X iv : a st ro - p h / 04 01 12 2 v 2 1 9 Ja n 20 04 High Energy Gamma - Ray Astronomy

The physics results of high energy γ-ray astronomy are reported, emphasizing recent achievements with ground-based detectors. This includes some of the instrumental developments and latest projects. The fundamental contribution of the field to the question of Cosmic Ray origin is highlighted.

ar X iv : a st ro - p h / 98 04 00 3 v 1 1 A pr 1 99 8 The MACHO Project LMC Variable Star Inventory : Classical Cepheids and AGB Variables

The MACHO Project's time-sampled photometric database contains thousands of LMC variable star lightcurves. We briefly review the Cepheid catalog. A third sequence is identified in the period–luminosity diagram, lying parallel to and fainter than the 1H and F mode sequences. These are excellent candidates to be Cepheids crossing the instability strip for the first time. However, we find no evide...

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ar X iv : a st ro - p h / 04 01 42 8 v 1 2 1 Ja n 20 04 IS THE LOCAL BUBBLE DEAD ?

We give a summary of the current state of Local Bubble research, resulting from the discussions of a dedicated panel meeting. After more than 25 years of intense observational and theoretical work, we are still far from a coherent picture, although a probable one emerges at the horizon. A multi-supernova origin seems to be the best guess, with non-equilibrium cooling and soft X-ray emission acc...

ar X iv : a st ro - p h / 04 01 29 1 v 1 1 5 Ja n 20 04 INTEGRAL Spectrometer Analysis of GRB 030227 & GRB 030131

The spectrometer SPI on board INTEGRAL is capable of high-resolution spectroscopic studies in the energy range 20 keV to 8 MeV for GRBs which occur within the fully coded field of view (16 • corner to corner). Six GRBs occurred within the SPI field of view between October 2002 and November 2003. We present results of the analysis of the first two GRBs detected by SPI after the payload performan...