Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009rmxac..35q.305r&link_type=abstract
XII Latin American IAU Regional Meeting (Eds. G. Magris, G. Bruzual, & L. Carigi) Revista Mexicana de Astronomía y Astrofísica (
Other
Scientific paper
HD 76534 is a B2Ve visual binary star, usually classified as Herbig Be, although there are indications that it could be a classical Be, due to its low NIR excess. The few observations made until today are basically in Hα and show a quick and irregular variability in its profile, generating different suggestions for the circumstellar envelope. Recently, FUSE observations confirmed HD 76534 as a Herbig star, with a clearing of the dust in the inner region of the CS environment (due to the intense radioactive field or planet formation), and revealed the existence of circumstellar gas (H2). In this work we present two high resolution spectra obtained with FEROS La Silla spectrograph, ESO, in observations six months apart from the other. The Hα profiles in these spectra are very diverse from what has been observed until now. The photospherical absorption wings are clearly visible, having a central emission with a well delineated double peak (FWHM > 600 km s^-1). The V/R reason is the same and V > R, which leads to the conclusion that the disc is not stable, differently of what has already been published. In addition, there are signals of activity in one of the spectra: an extra emission component, with a larger FWHM (> 600 km s^-1), but with a blueshifted absorption. Eventually, this can mean quick matter ejections.
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