We have studied the kinematics of the HH 399 jet, which was recently discovered in the Trifid Nebula. The data were obtained in the [N II] 6583 Å line with a scanning Fabry-Pérot interferometer (TAURUS-2) and in the [S II] 6717, 6731 Å lines with an echelle spectrograph. The analysis of the radial velocities measured along the jet indicates that

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We present calibrations of the effective temperatures of giant stars versus [Fe/H] and colours (U-V), (B-V), (R-I), (V-R), (V-I), (V-K), (J-H), (J-K), (I-K), (V-L'), (b-y) and (u-b). These calibrations are based on a large sample of field and globular cluster stars which roughly cover spectral types from F0 to K5. Their effective temperatures

Convective line asymmetries in the optical spectrum of two metal-poor stars, Gmb 1830 and HD 140283, are compared to those observed for solar metallicity stars. The line bisectors of the most metal-poor star, the subgiant HD 140283, show a significantly larger velocity span that the expectations for a solar-metallicity star of the same spectral

On July 31, 1999 the Lunar Prospector (LP) spacecraft was commanded to deorbit and thus impact into the floor of a permanently shadowed crater at -88.7S, 42E (Goldstein, et al. 1999, GRL 26, pp1653-1656 and paper 38.06 at this conference). Coordinated observational program (spectroscopy and imaging) were carried out at HST, SWAS, Keck, McDonald

We study radiative transfer through a weakly polarizing medium, i.e., a medium in which the degree of polarization of the absorbed, retarded, and emitted light is always weak. In this case, the general radiative transfer equation for the Stokes parameters yields very simple formal solutions. The intensity does not depend on the polarization, and