ar X iv : a st ro - p h / 97 07 33 5 v 1 3 0 Ju l 1 99 7 26 Al in the local interstellar medium

ar X iv : a st ro - p h / 97 07 27 4 v 1 2 5 Ju l 1 99 7 Nonlinear Pulsations

We review some of the recent advances in nonlinear pulsation theory, but also insist on some of the major extant shortcomings.

ar X iv : a st ro - p h / 99 10 06 5 v 1 4 O ct 1 99 9 The Interstellar Medium of Lens Galaxies

We use observations from the CASTLES survey of gravita-tional lenses to study extinction in 23 lens galaxies with 0 < z l < 1. The median differential extinction between lensed images is ∆E(B −V) = 0.05 mag, and the directly measured extinctions agree with the amount needed to explain the differences between the statistics of radio and (optical) quasar lens surveys. We also measure the first ex...

ar X iv : a st ro - p h / 97 11 19 0 v 1 1 7 N ov 1 99 7 In Situ Measurements of Interstellar Dust

We present the mass distribution of interstellar grains measured in situ by the Galileo and Ulysses spaceprobes as cumulative flux. The derived in situ mass distribution per logarithmic size interval is compared to the distribution determined by fitting extinction measurements. Large grains measured in situ contribute significantly to the overall mass of dust in the local interstellar cloud. Th...

ar X iv : a st ro - p h / 97 11 24 4 v 1 2 0 N ov 1 99 7 POPULATION SYNTHESIS OF HIGH ENERGY TRANSIENTS RELATIVISTIC BINARY MERGING RATES

ar X iv : a st ro - p h / 97 07 22 3 v 1 2 0 Ju l 1 99 7 Neutral carbon in the protoplanetary nebulae CRL 618 and CRL 2688

The 609 µm 3 P 1 → 3 P 0 line of neutral atomic carbon has been detected in the protoplanetary nebulae CRL 618 and CRL 2688. C I appears to be about 7% as abundant as CO in CRL 2688, and 70% as abundant as CO in CRL 618. C I emission arises primarily from the slow component of the wind from these objects. The data presented here indicate that C I gradually becomes more abundant as the star leav...