Other
Scientific paper
Aug 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003basbr..23..114g&link_type=abstract
Boletim da Sociedade Astronômica Brasileira (ISSN 0101-3440), vol.23, no.1, p. 114-114
Other
Scientific paper
Herbig Ae/Be objects are pre-main sequence stars of intermediate mass (2 to 10 M¤) in an analogous fashion to T Tauri stars. Recent studies using coronagraphic techniques have shown circumstellar disks around such objects and the study of the interaction between the star and the circumstellar medium may provide some understanding of this stage of the stellar evolution. Such interaction may occur as a gain or loss of matter resulting in a change of the star's angular momentum and can be studied using absorption patterns observed in line profiles of hydrogen lines like, Ha, Hb, Hg, Hd and other metallic lines such as Na i D and Ca ii. An accretion episode may be identified by a redshifted absorption component (RAC) and a chemical analysis of these RACs characterize the episode as produced by gaseous structures from the inner parts of the disk or by evaporation of a comet-like body in a star-grazing orbit. We have investigated an accretion episode in the Herbig candidate PDS080, using spectra obtained with the 1.52m ESO telescope at La Silla (Chile) in May 2002. In a preliminary analysis we suggest that the gas falling onto PDS080 was not produced by evaporation of a comet-like body, being a gaseous structure from the disk/envelope the most probable cause of the RACs in the spectra of this star.
Alencar Silvia H. P.
Corradi J. B. W.
Guimaraes Marcelo Medeiros
Vieira L. A. S.
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