Details

Autor(en) / Beteiligte

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

Titel

X-shooter spectroscopy of young stellar objects: II. Impact of chromospheric emission on accretion rate estimates

Ist Teil von

• Astronomy and astrophysics (Berlin), 2013-03, Vol.551, p.1-20

Erscheinungsjahr

2013

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• The lack of knowledge of photospheric parameters and the level of chromospheric activity in young low-mass pre-main sequence stars introduces uncertainties when measuring mass accretion rates in accreting (Class II) young stellar objects. A detailed investigation of the effect of chromospheilc emission on the estimates of mass accretion rate in young low-mass stars is still missing. This can be undertaken using samples of young diskless (Class III) K and M-type stars. Our goal is to measure the chromospheric activity of Class III pre main sequence stars to determine its effect on the estimates of the accretion luminosity (L[subacc]) and mass accretion rate (M[subacc]) in young stellar objects with disks. Values of L[subacc] [< or=]10[sup -3] obtained in accreting low-mass pre main sequence stars through line luminosity should be treated with caution because the line emission may be dominated by the contribution of chromospheric activity.