IRAC Imaging of the Pleiades

Details IRAC Imaging of the Pleiades IRAC Imaging of the Pleiades

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...38f&link_type=abstract

Spitzer Proposal ID #38

Computer Science

Scientific paper

Imaging in all four IRAC bands will be obtained for members of both clusters ranging in mass from the top of the main sequence to the faintest known cluster members, using the "cluster" mode. One goal of the observations will be to define the single-star main sequencen the four IRAC bands at (a) solar metallicity and age ~ 100 Myr (i.e. members of the Pleiades) and (b) at [Fe/H] ~ +0.14 and age ~ 600 Myr (i.e. members of the Hyades). In the Pleiades, this will include obtaining IRAC photometry for most of the known or proposed sub-stellar members of the cluster. Comparison of the IRAC colors for the sub-stellar Pleiades members to older VLM stars (and to very young, sub-stellar objects identified in star-forming regions) will help to empirically establish the gravity sensitivity of the IRAC colors at very low masses. A second goal of the observations will be to search for previously unknown, very low mass members of the cluster, either as companions to the targeted members or as "free-floating" cluster members that happen to be located near the targeted members. The goal of the observations of the target objects is to obtain photometry with intrinsic S/N ~ 1% in all four IRAC bands (or 2% in the SiAs bands for the faintest targets) in order to define the IRAC CM and CC diagrams as precisely as possible. The goal for the search for new, even lower mass Pleiades members is to be able to detect substellar mass members of the Pleiades down to 10 M(Jup) at 4.5 microns.

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