Archival Study of Hyades Debris Disks

Details Archival Study of Hyades Debris Disks Archival Study of Hyades Debris Disks

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20044c&link_type=abstract

Spitzer Proposal ID #20044

Physics

Scientific paper

We propose to use the Spitzer Space Telescope archival IRS, IRAC and MIPS observations of 17 stars in the Hyades star cluster to augment the data that we are obtaining in our Cycle 1 GO program 3371, in order to search for remnant debris disks in a homogeneous sample of stars of 625My age. The dominant independent variable in the sample is the stellar mass. The age of the Hyades corresponds to the era of the late heavy bombardment in our solar system about 3.9Gy ago. Thus, it is reasonable to believe that these Hyades dwarfs might also have rapidly evolving debris disks at this age. Our combined sample stars range from F8V to M2V. We have measured the effective temperature, surface gravity, micro- and macro-turbulence, the abundance of Fe, Si, Ti, Na, Mg, Ca, and Zn, the projected rotational velocity (v sin i), as well as the stellar chromospheric activity index for most of the stars in the sample. Any remnant debris disks around these Hyades stars would have escaped detection by IRAS, and would have been near the sensitivity limit of ISO if they are similar in properties to a solar-type zodiacal disk.

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