The petroleum and coal models of the unidentified infrared emissions (UIE), sometimes referred also as unidentified infrared bands (UIBs) has been reviewed...
Photometric Inference of the Corotation Radii of Ten Barred Galaxies
We have used photometric images of ten barred galaxies in the B and I bands to infer the geometrical and dynamical parameters of their bars: Their length, (R...
Visible photometry of the RS CVn system AR Lac is presented. We find some interesting features in the light curves. Also a possible oscillation with period 1.05...
Physical parameters of low-ionization knots and jets in PNe: NGC 7009, K 4-47, and NGC 6543
In addition to the large-scale outflows, which form their round, elliptical, and bipolar shells, planetary nebulae (PNe) also have, usually on smaller scales...
Polarization in the young cluster NGC 6611: circumstellar, interstellar, or ... both?
We obtained linear polarization observations of 82 A/B-type stars in the young cluster NGC 6611, in order to probe the circumstellar material and to search for...
Problems and possibilities in fine-tuning of the Cepheid P- L relationship
Factors contributing to the scatter around the ridge-line period-luminosity relationship are listed, followed by a discussion how to eliminate the adverse...
Proper Motions and Velocity Asymmetries in the RW Aur Jet
We present adaptive optics spectro-imaging observations of the RW Aur jet in optical forbidden lines, at an angular resolution of 0.4″. Comparison with HST data...