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Undergraduate students who seek a bachelor degree in Dutch universities of applied sciences are supposed to learn also research skills so that they can provide innovative solutions to real problems of the society and businesses in their future careers. Current education and textbooks on research skills are not tuned well to software engineering dis...
VBLUW photometry of the microvariations of AG Car (1987/1988) and HR Car (1981/1982 and 1987/1988) and of the macrovariations of HR Car (1984/1987) is presented and discussed. Both objects, although at or close to minimum light, show small S Dor eruptions corresponding to an increase in the mass loss rate of about 20 percent. The time scale of thes...
Far ultraviolet spectra of the two Herbig Ae stars UX Ori and CD -44°3318 are used to derive spectral types A2 III for UX Ori, and A0 - 1 III for CD -44°3318. The spectral energy distributions are in agreement with that of a Kurucz model with Teff = 9500K and log g = 4.0. In the near infrared both stars have a large excess of radiation, due to boun...
The spectral classifications of the two Herbig Ae stars UX Ori and CD-44 deg 3318 are reconsidered. The far-UV spectra of the stars are both similar to those of early A-type supergiants; however, the spectral types A2 III and A0-1 III are here derived for the respective stars based on continuum shapes, absorption features, and distance arguments. A...
The spectrum of Nb IV was observed with a sliding spark in the region from 430-3000 Å on the 6.5 m normal incidence vacuum spectrograph and the 3.4 m Jarrell-Ash spectrograph at the Zeeman-Laboratorium. About 294 lines were observed. The level system (ground configuration 4d2, isoelectronic with Sr I) was revised and extended to include 4d nl with...