Debris Disk Evolution in A stars

Details Debris Disk Evolution in A stars Debris Disk Evolution in A stars

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...40r&link_type=abstract

Spitzer Proposal ID #40

Computer Science

Scientific paper

We defined this program by hypothesizing that debris disks would have completed any significant evolution by the time they had aged to a few hundred million years, and that we therefore needed to study a sample of stars out to about 1 Gyr. A stars provide a high luminosity probe where surrounding material is easily visible over this age range. We also set the requirement that MIPS should be able to detect the stellar photosphere at 70um, equivalent to requiring that the star be brighter than about 7.4 magnitude, or for main sequence A stars, that the star be closer than about 170pc. A separate sample was selected for which MIPS should be able to detect the photosphere at 160mm, requiring the star to be brighter than about magnitude 3.5. Ages have been estimated from cluster membership, association with moving groups, or Stromgren photometry combined with Hipparchos distances. The stars have been screened for relatively low columns of atomic hydrogen. We have coordinated with a similar program by Michael Jura to provide more intense sampling at young ages. Our total sample is about 140 objects, with a similarly sized sample in his program.

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