Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...191.9203m&link_type=abstract
American Astronomical Society, 191st AAS Meeting, #92.03; Bulletin of the American Astronomical Society, Vol. 29, p.1360
Other
Scientific paper
We present observations of the lambda =1 cm continuum emission from ten young stellar systems with the BIMA array. Accurate measurements of the flux at lambda =1.1 cm and lambda =0.9 cm were possible for eight of the systems. The power-law spectral index of the emission from these systems varies from 0.4 for L1551 IRS5 to 2.6 for NGC 1333 IRAS4. In the former case, the emission is dominated by free-free radiation; in the later, the emission arises mainly from dust. One of the target sources with detectable emission is the close binary system GG Tau which is known to have a circumbinary disk. Combining our data with previous measurements at other wavelengths, and with modeling of the disks and envelopes, we estimate the relative contributions from free-free and dust emissions and derive estimates of the spectral index of the dust emission in several systems. The data allow us to look at the spectral index of the dust emissivity at lambda =1 cm and to extend our analysis to other wavelengths to estimate the spectral index between 1 cm, 2.7 mm and 1.3 mm. The wavelength dependence of the dust emissivity provides a rough measure of mean grain sizes in these systems, hence a view into the dust coagulation process and the building of planetesimals.
Carlstrom Johan
Joy Marhshall
Looney Leslie W.
Mundy Lee G.
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