We review current understanding of star formation, outlining an overall theoretical framework
and the observations that motivate it. A conception of star formation has emerged in which …

▪ Abstract We summarize the properties of FU Orionis variables, and show how accretion
disk models simply explain many peculiarities of these objects. FU Ori systems demonstrate …

Using results and calibrations from a previous paper (Gullbring et al. 1997), we estimate disk
accretion rates for pre–main-sequence stars in the Taurus and Chamaeleon I molecular …

This paper analyzes optical and infrared photometry of pre-main-sequence stars in the
Taurus-Aunga molecular cloud. More than half of the stars in our sample have excess near …

We present the results of an extensive 1.3 mm continuum mosaicing study of the rho
Ophiuchi central region obtained at the IRAM 30-m telescope with the MPIfR 19-channel …

We re-examine the observed near-infrared properties of T Tauri stars and interpret them with
the aid of accretion disk models. Based upon a careful analysis of the dereddened near …

Recent discoveries of extrasolar planets and new direct evidence for protoplanetary disks
around young stars have had a major impact on our understanding of star and planet …

We present a grid of radiation transfer models of axisymmetric young stellar objects (YSOs),
covering a wide range of stellar masses (from 0.1 to 50 M☉) and evolutionary stages (from …

We discuss the properties of an accretion disk around a star with parameters typical of
classical T Tauri stars (CTTSs) and with the average accretion rate for these disks. The disk …

We present a new mid-infrared photometric study of the rho Oph young stellar population
which includes data for 56 objects. The sources for this study were largely selected from a K …