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Proceedings Paper

VLT FORS spectra of Be stars in the SMC cluster NGC 330
Author(s): Wolfgang Hummel; Wolfgang Gaessler; Bernard Muschielok; Harald Schink; Harald E. Nicklas; Giancarlo Conti; Dario Maccagni; Stefan Keller; Karl-Heinz Mantel; Immo Appenzeller; Gero Rupprecht; Walter Seifert; Otmar Stahl; Karl Tarantik
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Paper Abstract

We used FORS2 at UT2 of the VLT to obtain low resolution spectra of early type emission line stars in the field of the young open SMC cluster NGC 330. This cluster is known for its exceptional large number fraction of Be stars and could play a key role in constraining the Be phenomenon in general. 48 of the 59 program stars identified as H(alpha) excess sources by CCD imaging photometry can be confirmed to show H(alpha) line emission superimposed on a strong continuum. Comparison with VLT-FORS1 spectra collected a year earlier shows no or only a low significance of variability on the time scale of a year. To test the prediction of the hybrid model for global disk oscillations in Be star circumstellar disks we compared the number ratio of Be stars with asymmetric line profiles to the total number of Be stars with the known ratio of galactic field Be stars. About 10 of 47 emission line stars show asymmetric line profiles hence the theoretical prediction is not matched. We discuss several possibilities which might explain the discrepancy.

Paper Details

Date Published: 29 June 2000
PDF: 11 pages
Proc. SPIE 4005, Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes, (29 June 2000); doi: 10.1117/12.390141
Show Author Affiliations
Wolfgang Hummel, Ludwig-Maximilians-Univ. Muenchen (Germany)
Wolfgang Gaessler, Ludwig-Maximilians-Univ. Muenchen (Germany)
Bernard Muschielok, Ludwig-Maximilians-Univ. Muenchen (Germany)
Harald Schink, Univ. Goettingen (Germany)
Harald E. Nicklas, Univ. Goettingen (Germany)
Giancarlo Conti, Istituto di Fisica Cosmica (Italy)
Dario Maccagni, Istituto di Fisica Cosmica (Italy)
Stefan Keller, Research School of Astronomy and Astrophysics/Mt. Stromlo Observatory (Australia)
Karl-Heinz Mantel, Ludwig-Maximilians-Univ. Muenchen (Germany)
Immo Appenzeller, Landessternwarte Heidelberg (Germany)
Gero Rupprecht, European Southern Observatory (Germany)
Walter Seifert, Landessternwarte Heidelberg (Germany)
Otmar Stahl, Landessternwarte Heidelberg (Germany)
Karl Tarantik, Institut fuer Astronomie und Astrophysik und Univ.-Sternwarte Muenchen (Germany)

Published in SPIE Proceedings Vol. 4005:
Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes
Jacqueline Bergeron, Editor(s)

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