High-resolution spectroscopy in TR 37: Gas accretion evolution in evolved dusty disks

Aurora Sicilia-Aguilar (Lead / Corresponding author), Lee W. Hartmann, Gabor Furesz, Thomas Henning, Cornelis Dullemond, Wolfgang Brandner

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104 Citations (Scopus)

Abstract

Using the Hectochelle multifiber spectrograph, we have obtained high-resolution (R similar to 34,000) spectra in the H alpha region for a large number of stars in the 4 Myr old cluster Tr 37, containing 146 previously known members and 26 newly identified ones. We present the H alpha line profiles of all members, compare them to our IR observations of dusty disks (Two Micron All Sky Survey JHK + IRAC + MIPS 24 mu m), use the radial velocities as a membership criterion, and calculate the rotational velocities. We find a good correlation between the accretion-broadened profiles and the presence of protoplanetary disks, noting that a small fraction of the accreting stars presents broad profiles with H alpha equivalent widths smaller than the canonical limit separating classical T Tauri stars (CTTSs) and weak-lined T Tauri stars (WTTSs). The number of strong accretors appears to be lower than in younger regions, and a large number of CTTSs have very small accretion rates (M
Original languageEnglish
Pages (from-to)2135-2155
Number of pages21
JournalAstronomical Journal
Volume132
Issue number5
DOIs
Publication statusPublished - 9 Oct 2006

Keywords

  • accretion, accretion disks line : profiles planetary systems : protoplanetary disks stars : pre-main-sequence stars : rotation T-TAURI STARS MAIN-SEQUENCE STARS ORION-NEBULA CLUSTER EMISSION-LINE DIAGNOSTICS INTERMEDIATE-MASS STARS CIRCUMSTELLAR DISKS MAGNETOSPHERIC ACCRETION PROTOPLANETARY DISK ROTATION PERIODS BROWN DWARFS

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