Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7310h&link_type=abstract
HST Proposal ID #7310
Computer Science
Hst Proposal Id #7310 Young Stars And Circumstellar Material
Scientific paper
We propose to study how accretion disks interact with stars in young binary systems by measuring the rates that mass accumulates onto each component of the pair. The amount that photospheric absorption lines decrease in depth relative to lines of similar stars that lack accretion signatures defines how much excess continuum is present in the spectra, and this excess continuum is proportional to the mass accretion rate onto the star. Our proposed observations will also yield the spectral types, reddening, and luminosity of each star, so it will be possible to estimate the mass and age of each component by comparing the location of the stars in an HR- diagram with pre-main-sequence evolutionary tracks. The presence of high velocity O I Lambda6300 emission will enable us to test whether close young binaries drive single collimated jets, or if jets emerge from each component of the system. Our sample consists of 17 out of the known 18 subarcsecond binaries in theTAUrus dark cloud {projected separations between 10 AU and 140 AU} that possess accretion disks. The close separation range, which can only be observed with HST, is critical to our understanding of star formation because within this range protostellar disks are expected to change from being mostly circumstellar to being mostly circumbinary. The proposed observations will allow us to develop the first clear picture of how low mass binary stars and their surrounding accretion disks form and evolve.
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