Huascaran δ18O as an indicator of tropical climate during the Last Glacial Maximum
Geophysical Research Letters American Geophysical Union (AGU) 26:9 (1999) 1345-1348
Critical Protoplanetary Core Masses in Protoplanetary Disks and the Formation of Short-Period Giant Planets
(1999)
Precession of collimated outflows from young stellar objects
Astrophysical Journal 512:2 PART 2 (1999)
Abstract:
We consider several protostellar systems in which either a precessing jet or at least two misaligned jets have been observed. We assume that the precession of jets is caused by tidal interactions in noncoplanar binary systems. For Cep E, V1331 Cyg, and RNO 15-FIR, the inferred orbital separations and disk radii are in the range 4-160 AU and 1-80 AU, respectively, consistent with those expected for pre-main-sequence stars. Furthermore, we assume or use the fact that the source of misaligned outflows is a binary and evaluate the length scale over which the jets should precess as a result of tidal interactions. For T Tau, HH1 VLA 1/2, and HH 24 SVS63, it may be possible to detect a bending of the jets rather than "wiggling." In HH 111 IRS and L1551 IRS5, wiggling may be detected on the current observed scale. Our results are consistent with the existence of noncoplanar binary systems in which tidal interactions induce jets to precess.Subtropical water vapor as a mediator of rapid global climate change
Chapter in Mechanisms of Global Climate Change at Millennial Time Scales, American Geophysical Union (1999) 22
Critical protoplanetary core masses in protoplanetary disks and the formation of short-period giant planets
Astrophysical Journal 521:2 PART 1 (1999) 823-838