Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23...12f&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 12-12
Other
Scientific paper
B[e] stars have a B type spectrum with forbidden lines in their optical spectrum. They form a very heterogeneous group with stars in different evolutionary stages. This group has pre-main sequence stars, supergiants, compact planetary nebulae, symbiotic objects and stars whose evolutionary stage is unknown, the unclassified B[e] stars. For this reason, it has been suggested, in the literature, the expression "Stars with the B[e] Phenomenon". Intending to improve the discussion about the nature of some unclassified B[e] stars, we have analyzed high and low resolution spectra, obtained by us, with the FEROS and B&C spectrographs respectively, at the ESO 1.52m telescope in La Silla, Chile (agreement ESO/ON). First we have made a spectral atlas and after we have compared the observed luminosity of forbidden lines, specially [SII] lines, with luminosities predicted by a code written by us. This code derives the photoionization structure of a spherical and expanding wind with H, He and S. We are also considering the presence of an equatorial disk. Our main result is the mass loss rate () of the studied objects. This technique was already applied for the star Hen 2-90, where we have found a of 4 x 10-8 M¤ year-1, considering a spherical wind and 7 x 10-9 M¤ year-1, considering an equatorial disk. Both values indicate that this object is probably a compact planetary nebula showing the B[e] phenomenon (paper in preparation). We will show this conclusion, describing the code, and also the results for other unclassified B[e] stars of our sample, specially the stars MWC300 and CD-4211721.
Fernandes Marcelo Borges
Kraus de Araujo F. X. M.
Lamers Henny
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