X-Shooter observations of low-mass stars in the Eta Chamaeleontis association

Abstract

The nearby Eta Chamaeleontis association is a collection of 4-10 Myr old stars with a disk fraction of 35-45%. In this study, the broad wavelength coverage of VLT/X-Shooter is used to measure the stellar and mass accretion properties of 15 low mass stars in the Eta Chamaeleontis association. For each star, the observed spectrum is fitted with a non-accreting stellar template and an accretion spectrum obtained from assuming a plane-parallel hydrogen slab. Five of the eight stars with an IR disk excess show excess UV emission, indicating ongoing accretion. The accretion rates measured here are similar to those obtained from previous measurements of excess UV emission, but tend to be higher than past measurements from H-alpha modeling. The mass accretion rates are consistent with those of other young star forming regions.

Accepted for publication in Astronomy & Astrophysics

References in corpus (18)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• X-Shooter spectroscopy of young stellar objects in Lupus: Accretion properties of class II and transitional objects
• An Optical Spectroscopic Study of T Tauri Stars. I. Photospheric Properties
• UV excess measures of accretion onto young very low-mass stars and brown dwarfs
• A Spitzer view of protoplanetary disks in the gamma Velorum cluster
• Placing the spotted T Tauri star LkCa 4 on an HR diagram
• Accretion Disks around Young Stars: Lifetimes, Disk Locking and Variability
• Tracing Slow Winds from T Tauri Stars via Low Velocity Forbidden Line Emission
• Connection between jets, winds and accretion in T Tauri stars: the X-shooter view
• X-Shooter spectroscopy of young stellar objects: V - Slow winds in T Tauri stars
• Measuring tiny mass accretion rates onto young brown dwarfs
• A continuum of accretion burst behavior in young stars observed by K2
• X-Shooter study of accretion in $\rho$-Ophiucus: very low-mass stars and brown dwarfs
• Unveiling extremely veiled T Tauri stars
• The Keele-Exeter young cluster survey: I. Low mass pre-main sequence stars in NGC 2169
• Optical and infrared properties of V1647 Orionis during the 2003-2006 outburst. II. Temporal evolution of the eruptive source
• Proper motions of young stars in Chamaeleon. I. A Virtual Observatory study of spectroscopically confirmed members

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