Detailed, high spatial resolution spectroscopy of the WR ring nebula M1-67 surrounding the WN 8 star WR 124 is presented. Abundances for 4 positions in M1-67 are derived and it is found that N is enhanced by a factor of 4 - 7.5, O is deficient by a factor of 5 - 7.5 and S has a normal H II region abundance. This remarkable abundance pattern leads

High signal-to-noise spectra of the H-beta region of eight radio-loud quasars are presented in an investigation seeking evidence for the emission of this line from a disk. Although the double-humped profile expected in simple versions of the disk hypothesis is not found, shoulders are found in the profile expected in a modified form of this idea. A

The authors calculate the velocity distribution of halo particles using realistic models for the density profiles of the Galactic disk, spheroid, and halo components. They get the resulting velocity distribution, which is different from the Maxwellian distribution of isothermal halo. The authors investigate the consequences concerning the time

We calculate the velocity distribution of halo particles using realistic models for the density profiles of the Galactic disk, spheroid, and halo components. We get the resulting velocity distribution, which is different from the Maxwellian distribution of isothermal halo. We investigate the consequences concerning the time averaged count rate and

The results of a combined near-infrared and IRAS mapping study of five H II regions are presented for which fairly complete information at optical and radio wavelengths previously existed. The near-infrared observations, carried out with the 2.1-m telescope at Observatorio de San Pedro Martir (Mexico), made it possible to study the stellar content

New IR photometry of M10 red giant stars is presented, and these data are used to derive the reddening and the distance modulus of the M10 cluster and to locate the red-giant-branch in the theoretical HR diagram. Values obtained for E(B - V) and (m - M)0 are 0.17 + or - 0.05 and 14. + or - 0.2, respectively, assuming that M10 cluster has a