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Circumstellar envelopes of intermediate mass young stars

Grant number: 08/01533-4
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): July 01, 2008
Effective date (End): August 31, 2012
Field of knowledge:Physical Sciences and Mathematics - Astronomy - Stellar Astrophysics
Principal researcher:Jane Cristina Gregorio-Hetem
Grantee:Rodrigo Georgetti Vieira
Home Institution: Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Associated research grant:05/00397-1 - Chemical evolution and galactic and extragalactic stellar populations by spectroscopy and imaging, AP.TEM


Herbig Ae/Be stars are classified in groups according to the slope of their spectral energy distribution (SED) in the infrared region. The steeper is this slope, the greater are the infrared excesses observed and the amount of circumstellar material associated to the object. Some works relate this classification to the evolutive stage of the object, where the most embeded objects (those with the larger circumstellar structures) are expected to be found in the first stages of pre-main sequence evolution. In the present work, we will select a sample of objects classified as Herbig Ae/Be stars, which probably have spherical envelopes made of gas and dust and other characteristics typically found in less evolved objects. We will study such envelopes following the two main approachs: (i) modelling of the dust-gas surrounding, in order to reproduce the physical conditions related to the radaitive transfer processes and the particle dynamics; and (ii) sensible observations of high spatial resolution, to obtain direct images in sub-millimetric wavelengths. These observations will allow the measurement of the circumstellar parameters, such as the mass and the size of the envelope, which will be confronted to those calculated by the model. The observational data will be obtained in collaboration with the group of Dr. P. André, the Principal Investigator of ArTeMiS project.

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
VIEIRA, R. G.; GREGORIO-HETEM, J.; HETEM, JR., A.; STASINSKA, G.; SZCZERBA, R. Distinguishing post-AGB impostors in a sample of pre-main sequence stars. Astronomy & Astrophysics, v. 526, FEB 2011. Web of Science Citations: 7.

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