STIS Snapshot Survey of Boron Abundances in Early-B Stars

Details STIS Snapshot Survey of Boron Abundances in Early-B Stars STIS Snapshot Survey of Boron Abundances in Early-B Stars

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10175p&link_type=abstract

HST Proposal ID #10175

Computer Science

Hst Proposal Id #10175 Hot Stars

Scientific paper

Boron abundances in massive stars provide a unique constraint for new theoretical models of stellar evolution that include rotation. We propose to use STIS to measure the B III doublet near 2066 Angstroms in a large sample of early-B stars. A high priority will be placed on obtaining abundances for several stars in each of a number of different young clusters, assocations, and star forming regions. This will allow quantitative comparision with theoretical predictions of rotationally driven mixing in early B stars as function of mass, age, and rotation rate. Since boron abundance measurements are not possible for large vsin{i} values, and sin{i} is not known for individual stars, a large sample is required to statistically test the predictions of boron depletion as a function of the true rotation rate. For bright nearby stars {25 targets} we will use the G230MB grating and obtain very high S/N {>200:1}. This avoids the need for an ND filter which would discard 99% of the photons. Spectral synthesis techniques will allow us to derive accurate abundances despite the moderate resolution of this grating, even for stars with relatively high vsin{i} values. This is especially important in testing rotational models, as current abundance measurements are mostly for stars with much lower than average rotation rates. For fainter, more distant stars {27 targets} we will use the E230M or E230H grating with the 0.2x0.2 aperture.

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