Details

Autor(en) / Beteiligte

• Alcala, J M
• Natta, A
• Manara, C F
• Spezzi, L
• Stelzer, B
• Frasca, A
• Biazzo, K
• Covino, E
• Randich, S
• Rigliaco, E
• Testi, L
• Comeron, F
• Cupani, G
• D'Elia, V

Titel

X-shooter spectroscopy of young stellar objects: IV. Accretion in low-mass stars and substellar objects in Lupus

Ist Teil von

• Astronomy and astrophysics (Berlin), 2014-01, Vol.561, p.np-np

Erscheinungsjahr

2014

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• We present VLT/X-shooter observations of a sample of 36 accreting low-mass stellar and substellar objects (YSOs) in the Lupus star-forming region, spanning a range in mass from [similar]0.03 to [similar]1.2 M, but mostly with 0.1 M<M[sub *]< 0.5 M. Our aim is twofold: firstly, to analyse the relationship between excess-continuum and line emission accretion diagnostics, and, secondly, to investigate the accretion properties in terms of the physical properties of the central object. The accretion luminosity (L[subacc]), and in turn the accretion rate (M[subacc] ), was derived by modelling the excess emission from the UV to the near-infrared as the continuum emission of a slab of hydrogen. A number of properties indicate that the physical conditions of the accreting gas are similar over more than 5 orders of magnitude in M[subacc], confirming previous suggestions that the geometry of the accretion flow controls the rate at which the disc material accretes onto the central star.