Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986pasp...98.1081s&link_type=abstract
(Astronomical Society of the Pacific, Symposium on Starbursts and Very Young Stars, University of Colorado, Boulder, July 1986)
Astronomy and Astrophysics
Astronomy
7
Cosmology, Interstellar Matter, Star Formation, Stellar Evolution, Cooling, Molecular Clouds, Pre-Main Sequence Stars, Protostars, Stellar Mass
Scientific paper
The problem of star formation from gas of primordial composition is discussed. The thermal evolution and fragmentation of primordial clouds, and the early evolution of the resulting stars, have been followed in calculations done with Palla (Arcetri) and Salpeter (Cornell). Although the clouds lacked the coolants provided by metals in present-day molecular clouds, they could have fragmented to low- and intermediate-mass stars if they contracted to sufficiently high density. Primordial protostars collapse faster and have larger hydrostatic covers than their Population I counterparts. The shock radiation emanating from these cores is optically visible, with an effective temperature of about 5000 K. The pre-main-sequence contraction phase resembles that in present-day stars, despite very different initial conditions.
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