The new generation of spectrometers designed for extreme precision radial velocities enable correspondingly precise stellar spectroscopy. It is now fruitful to...
Incompressibility of hot nuclear matter and general relativistic stellar collapse
We have made a series of hydrodynamic calculations of core collapsing models to examine the effects of temperature dependence of nuclear compressibility. With...
Infrared observations of H II regions - S128 and G134.2+0.8 (GL 333)
Observations of S128 and G134.2+0.8, two active star forming H II regions, are reported. The exciting stars in both are probably detected and identified. In...
Infrared studies of Seyfert galaxies and of the irregular galaxy M 82
Middle and far infrared studies of the irregular galaxy M 82 and of Seyfert galaxies are presented. M 82 was observed spectrophotometrically from 8 to 13...
Binary models of symbiotic stars are discussed, analyzing the results of recent IR observations. It is indicated that a binary must have component masses of...
Intrinsic parameters of galactic luminous OB stars
We present the results of a spectroscopic analysis of 25 galactic luminous OB stars. The gravities are in general lower than previously assumed, especially for...
IRAS 17423-1755: A BQ() star with a variable velocity outflow
Infrared Astronomy Satellite (IRAS) 17423-1755 has been identified as a BQ() star. Its more remarkable observed features are large radial velocities, huge line...
New measurements of the lithium abundance in a sample of 37 field dwarfs of low metallicity (-0.6 ≥ [Fe/H] ≥ 3.2) are presented. Combining these observations...
The lithium abundance in 26 T Tauri stars is derived using data taken at the Isaac Newton Telescope and data from literature. The aim is to understand the...