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Rotation, convection, and magnetic activity in lower main-sequence stars
Rotation periods are reported for 14 main-sequence stars, bringing the total number of such stars with well-determined rotation periods to 41. It is found that the mean level of their Ca n H and KExpand
Accretion and the Evolution of T Tauri Disks
Using results and calibrations from a previous paper (Gullbring et al. 1997), we estimate disk accretion rates for preEmain-sequence stars in the Taurus and Chamaeleon I molecular cloud complexes.Expand
Disk accretion rates for T tauri stars
We present new measurements of disk accretion rates for T Tauri stars in the Taurus molecular cloud complex. Our results are based on intermediate-resolution spectrophotometry from 3200 to 5200 A,Expand
A Preliminary Study of the Orion Nebula Cluster Structure and Dynamics
We use optical and near-infrared star counts to explore the structure and dynamics of the Orion Nebula Cluster (ONC). This very young (<1 Myr) cluster is not circularly symmetric in projection but isExpand
Infrared Array Camera (IRAC) Colors of Young Stellar Objects
We compare the infrared colors predicted by theoretical models of protostellar envelopes and protoplanetary disks with initial observations of young stellar objects made with the Infrared ArrayExpand
The Mass Accretion Rates of Intermediate-Mass T Tauri Stars
We present Hubble Space Telescope ultraviolet spectra and supporting ground-based data for a sample of nine intermediate-mass T Tauri stars (IMTTSs; 1.5–4 M⊙). The targets belong to threeExpand
A Brγ Probe of Disk Accretion in T Tauri Stars and Embedded Young Stellar Objects
We report on observations of Paβ and Brγ for a sample of classical T Tauri stars in Taurus and find a tight correlation between the emission-line luminosities and the accretion luminosity as measuredExpand
Spitzer Observations of IC 348: The Disk Population at 2-3 Million Years
We present near- and mid-infrared photometry obtained with the Spitzer Space Telescope of ~300 known members of the IC 348 cluster. We merge this photometry with existing ground-based optical andExpand
Accretion processes in star formation
1. Overview 2. Initial conditions for protostellar collapse 3. Protostellar cloud collapse 4. Protostellar collapse: observations vs. theory 5. Disk accretion 6. The disks and envelopes of T TauriExpand