We propose to improve the calibration of the Wind momentum - Luminosity Relationship of hot stars at solar metallicity by adding new objects with well determined distances, stellar parameters and wind momenta. We propose to acquire STIS low- resolution FUV spectra of O- and B-supergiants belonging to the same OB association to determine their

We report optical observations of the GRB 980329 error box which represent the second earliest detection of the GRB 980329 optical transient. We determine R = 23.7 +/- 0.5 mag on 29.89 March, which is consistent with R = 23.6 +/- 0.2 mag as reported by Palazzi et al. (1998) on 29.99 March. Based on extrapolations of the light curve we claim that

We have observed the high excitation planetary nebulae NGC 7027, NGC 6543 and the low excitation planetaries Hu 2-1 and Cn 3-1 in the optical & near IR with the aim to contribute accurate measurements of their gaseous iron abundances. Use was made of multi-level atomic models of iron ions to interpret the observed forbidden lines of various iron

We propose spectroscopic observations of two new gravitational lens candidates, 0502+675 and 1440+122, discovered in our HST R-band snapshot survey of ~100 BL Lac objects. Each contains a double point source with separation of only 0.3 arcsec. In each case, a candidate for the lensing galaxy is also found. For 0502+675, a subsequent NICMOS H-band

This paper is the second part in a series, the first part of which presented an outline of the analysis of 60 spectra from a follow-up program to the Two Micron Galactic Survey (TGMS) project in the l=27 deg, b=0 deg area. In this second part, we present a more detailed explanation of the analysis, a library of the spectra for more complete

We discuss results on the oxygen abundance in a sample of 23 metal-poor (-3.0≤ [Fe/H] ≤ -0.3) unevolved stars and one giant. High resolutionspectroscopy of OH lines in the near UV allowed us to trace the early evolution of oxygenversus metallicity. Contrary to previous expectations, we find that oxygen abundances derived from these low excitation