6 papers
ISO impact on stellar models and vice versa
L. Decin, C. Waelkens, K. Eriksson +5
We present a detailed spectroscopic study of a sample of bright, mostly cool, stars observed with the Short-Wavelength Spectrometer (SWS) on board the Infrared Space Observatory (I…
ISO-SWS calibration and the accurate modelling of cool-star atmospheres: I. Method
L. Decin, C. Waelkens, K. Eriksson +5
A detailed spectroscopic study of the ISO-SWS data of the red giant Alpha Tau is presented, which enables not only the accurate determination of the stellar parameters of Alpha Tau…
Spectral variability of the binary HR 4049
Eric J. Bakker, David L. Lambert, Hans van Winckel +3
The H profile varies with the orbital period. The two strong shell type emission peaks are identified as from one single broad emission feature with an absorption centered aroun…
Photospheric composition of the carbon-rich 21 micron post-AGB stars IRAS 22223+4327 and IRAS 04296+3429
Leen Decin, Hans Van Winckel, Christoffel Waelkens +1
We present a detailed chemical analysis on the basis of high-resolution, high signal-to-noise optical spectra of two post-AGB objects IRAS 22223+4327 and IRAS 04296+3429. Both disp…
Variability and nature of the binary in the Red Rectangle Nebula
C. Waelkens, H. Van Winckel, L. B. F. M. Waters +1
We present new observations of the central binary inside the Red Rectangle nebula. The detection of zinc in the optical spectrum confirms that the peculiar photospheric abundances…
The 218 day period of the peculiar late B-type star HD 101584
Eric J. Bakker, Henny J. G. L. M. Lamers, L. B. F. M. Waters +1
We have searched for periodicity in the photometric and spectroscopic variations of the enigmatic star HD 101584 and found a long-term variability on a typical time scale of 1700 d…