Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30384b&link_type=abstract
Spitzer Proposal ID #30384
Physics
Scientific paper
We propose to obtain 160 micron maps of 13 dense cores with faint embedded sources (VeLLOs) and of 27 cores which lack sources. These cores were already mapped by Spitzer at shorter wavelengths, and by ground based telescopes at longer wavelengths. They have no observations near 160 microns, so their peak flux and total luminosities are very uncertain, as are the effects of the ISRF on their temperature stucture. Our proposed observations will determine each spectrum and its luminosity accurately enough to separate the contributions from internal and external heating. With current data, several of the embedded sources have luminosity < 0.1 Lsun, among the lowest known, which indicates substellar masses according to simple accretion models. Our more accurate luminosities will be used to estimate whether these sources have masses of brown dwarfs or of stars, and the related question of whether these sources have mass accretion rates expected from the standard model of low-mass star formation.
Bourke Tyler
Brooke Tim
Dunham Michael M.
Evans Neal II
Huard Tracy
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