Protostars and Planets VI, Heidelberg, July 15-20, 2013

Poster 1B089

Accretion in Young Stellar Objects: the POISSON Spectral Survey

Antoniucci, Simone (INAF - Osservatorio Astronomico di Roma)
Nisini, Brunella (INAF - Osservatorio Astronomico di Roma)
Garcia Lopez, Rebeca (Max Planck Institut fuer Radioastronomie, Bonn)
Caratti o Garatti, Alessio (Max Planck Institut fuer Radioastronomie, Bonn)
Giannini, Teresa (INAF - Osservatorio Astronomico di Roma)
Lorenzetti , Dario (INAF - Osservatorio Astronomico di Roma)
Cabrit, Sylvie (LERMA - Observatoire de Paris)
Eisloeffel, Jochen (Thueringer Landessternwarte Tautenburg)
Bacciotti, Francesca (INAF - Osservatorio Astrofisico di Arcetri)
Ray, Tom (Dublin Institute for Advanced Studies)

The POISSON project (Protostellar Optical-Infrared Spectral Survey On NTT) has collected low resolution spectra (0.6-2.5 um) of about 150 Spitzer-selected Class I/II Young Stellar Objects located in five different star-forming regions (ChaI-II, L1641, Ser, Lup, CrA). The main goal of the project is to study the accretion properties of the sources in relationship with their stellar parameters and circumstellar environment, and to investigate how these differ in the various parental clouds. The accretion luminosity (Lacc) and mass accretion rate (Macc) of the sources were derived from different optical/NIR emission lines commonly employed as tracers (namely [OI], Halpha, CaII, PaBeta, BrGamma) making use of the relevant empirical relationships present in the literature, which connect the line luminosity to Lacc. The accretion properties thus derived were then put in correlation with other source parameters, such as the stellar luminosity, mass, IR excess, and age. The results of this analysis will be presented and discussed, focusing in particular on the following aspects: i) the reliability and limitations of the different accretion tracers relationships; ii) the time evolution of the mass accretion rate and the Macc dependence on source mass.

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