Modelling of line-profile variability in WC stars
نویسندگان
چکیده
منابع مشابه
Searching for Line Profile Variability in HgMn Stars
Abstract. Spectra of four non-magnetic chemically peculiar late B type stars (HgMn) stars are analysed to detect periodic spectral line variations (LPVs). A procedure developed to study LPVs in Slowly Pulsating B stars has been adopted as pulsational properties of HgMn stars should be expected to be similar. In the preliminary results discussed here no conclusive evidence for periodic LPVs was ...
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We present a quantitative classification scheme for carbon and oxygen sequence Wolf—Rayet stars. Our scheme uses new high-quality optical AAT and INT observations of 20 stars for which we provide narrow-band photometry and estimates of interstellar reddenings. In increasing order of excitation, our spectral classes range from WC11 to WC4 for Wolf— Rayet stars with a dominant carbon line visual ...
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Through a high-resolution spectroscopic survey, we analyze the velocity field of 16 planetary nebulae with [WC]or wels-type nuclei in comparison with 8 nebulae having other central star types. We found spectral evidence for finite turbulent velocities in [WC]-type planetary nebulae superimposed on an essentially constant expansion velocity pattern. The nebulae around O-type stars show no eviden...
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Spectra of six Wolf-Rayet stars in the Large Magel-lanic Cloud (LMC) of the subtype WC 4, the dominant WC spectral type in the LMC, are taken with the Faint Object Spec-trograph (FOS) on board the Hubble Space Telescope (HST). They are analyzed by means of non-LTE models for spherically expanding atmospheres computed using standard assumptions. Complex model atoms of helium, carbon and oxygen a...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1999
ISSN: 0074-1809
DOI: 10.1017/s0074180900205482