Christopher J. Dolan
Thesis Research

Advisor: Robert D. Mathieu

Abstract

I am studying the influence of OB stars on the formation of low-mass stars. Massive stars, with their copious ionizing radiation and strong stellar winds, shock and disperse their parent giant molecular clouds. The shocks of ionization fronts and stellar winds against the densest regions of such clouds may trigger the formation of low-mass stars. On the other hand, the disruption and dispersal of the clouds must terminate ongoing star formation. We have undertaken a comprehensive study of the young, low-mass population of the Lambda Ori star-forming region in order to map the age distribution of the young low-mass stars with respect to the OB stars and dense molecular clouds. By determining the chronology of stellar birth, we may deduce the significance of proximity to massive stars for low-mass formation.

Papers

Christopher J. Dolan & Robert D. Mathieu
A WIYN Lithium Survey for Young Stars in the Lambda Orionis Star-Forming Region
Astronomical Journal, November 1999, vol 118, pp. 2409-2423
Abstract (2 Kb)
PostScript (1.0 Mb)
PDF (1.0 Mb)
Christopher J. Dolan & Robert D. Mathieu
The Spatial Distribution of the Lambda Orionis Pre-Main-Sequence Population
Astronomical Journal, to appear in the April 2001 issue
Abstract (2 Kb)
PostScript (1.2 Mb)
PDF (1.4 Mb)
Christopher J. Dolan
The Young Population of the Lambda Orionis Star-Forming Region
Ph.D. Thesis, August 2000
(141 pages; a compilation of the above two papers and a [soon to be submitted] third paper)
Abstract (2 Kb)
PostScript (7.5 Mb)
PDF (6.6 Mb)

Interesting Pictures
In and around the Lambda Ori star-forming region

     Picture      Source
Map of molecular clouds in CO Lang & Masheder 1998, PASA, 15, 70
IRAS 12, 60, 100-micron map SkyView
Color photo of Orion Sven Kohle & Till Credner
Wide-field H-alpha image Swarthmore H-alpha survey

Contact data:
dolan@astro.wisc.edu
475 N. Charter St.
Madison WI 53706-1582

Department of Astronomy, University of Wisconsin - Madison