Lee Hartmann

TL;DR: In this paper, preliminary calculations of protostellar cloud collapse starting from an isothermal, self-gravitating gaseous layer in hydrostatic equilibrium are presented, and it is suggested that the flat infalling envelope recently observed in HL Tau by Hayashi et al. is the result of collapse from an initially nonspherical layer.

TL;DR: In this article, a well-developed, observationally tested paradigm for accretion flows around young low-mass stars, consisting of infall to a rotating circumstellar disk, followed by accretion through the disk onto the central star.

TL;DR: In this article, the authors report near-infrared NICMOS observations of a remarkable low-luminosity Class I (protostellar) source in the Taurus Molecular Cloud.

TL;DR: In this paper, a marginal correlation was found between linewidth and lower excitation potential in all three objects for wavelengths longer than about 5000 A. Synthetic disk spectra were subtracted from observed spectral, and remarkably good fits were found for all the three objects.

TL;DR: The analysis of IUE observations of a filament on the western edge of the Cygnus Loop yields a shock velocity of about 130 km/sec, significantly higher than the velocity estimated from the optical spectrum as discussed by the authors.