Since the discovery of very low-Ti (VLT) basalts as tiny clasts and glasses in Apollo 17 drill cores, VLT basalts have been recognized as an important lunar rock type. Lunar sample 78526 (8.77 g), our largest specimen of VLT basaltic composition, is an impact melt composed of vitrophyric green glass with minor lithic and mineral inclusions. Major

Howardites contain dark, carbonaceous chondrite clasts making up a few percent of these meteoritic breccias. This work utilizes a micro-coring technique to extract 1-20 microgram-sized samples of these clasts from thin sections, and micro-INAA techniques to obtain trace element concentrations. The hope was that the trace element geochemical details

We obtain the Na I lambda 8183,8195 absorption line radial velocity curves for the polars ST LMi and MR Ser, from which we find the semi-amplitudes to be Kabs=329 +/- 9 km/s and Kabs=289 =/- 9 km/s respectively. We find that for both systems the effects on the Na I absorption lines due to X-rays heating the inner face of the secondary are

The gas of the Seyfert 2 galaxy NGC 5252 consists of an ionized bicone of gas and a region of neutral gas which fills the regions outside the ionized bicone. We present new HI maps of the neutral components with a spatial resolution which exceeds previously available maps by a factor of 2. In addition, the ionized component was imaged in the Hα

The polarization-free (POF) approximation (Trujillo Bueno and Landi Degl'Innocenti, 1996) is capable of accounting for the approximate influence of the magnetic field on the statistical equilibrium, without actually solving the full Stokes vector radiative transfer equation. The method introduces the Zeeman splitting or broadening of the line

The development of effective iterative methods capable of accurately solving NLTE Stokes transfer problems is of considerable importance for the investigation of solar and stellar magnetic fields. After briefly indicating the iterative approach which is being presently pursued for the exact solution of such problems, the particular regime where