DSpace - Tor Vergata: Item 2108/703

Please use this identifier to cite or link to this item: http://hdl.handle.net/2108/703

Title:	Accretion properties of embedded low mass protostars
Authors:	Buonanno, Roberto Nisini, Brunella Antoniucci, Simone
Keywords:	infrared stars spectroscopic techniques interferometric techniques stars: individual (Z CMa)
Issue Date:	26-Nov-2008
Abstract:	I present a work aiming at studying the accretion properties low mass embedded protostars making use of two observational techniques: near IR high resolution spectroscopy and inteferometry. Through the analysis of VLT/ISAAC near infrared spectra (R = 10000) of a sample of six Class I protostars, I have derived the accretion luminosity and mass accretion rates of the objects, using either the luminosity of Hi lines or determining the stellar properties from detection of the photospheric absorption lines. Only two objects show accretion-dominated luminosities, while in the other sources accretion accounts for only a smal fraction of the total luminosity, in spite of what is commonly expected for Class I stars in the main accretion phase. These findings therefore indicate a scenario where most Class I objects are more evolved than expected and have actually already acquired most of their mass. For sources displaying well developed jet-like structures, the ratio between mass l...
Description:	19. ciclo
URI:	http://hdl.handle.net/2108/703
Appears in Collections:	Tesi di dottorato in scienze matematiche e fisiche

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