Spitzer IRAC Observations of M67: A Prototypical Solar-age Solar-metallicity Cluster

Details Spitzer IRAC Observations of M67: A Prototypical Solar-age Solar-metallicity Cluster Spitzer IRAC Observations of M67: A Prototypical Solar-age Solar-metallicity Cluster

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5815s&link_type=abstract

American Astronomical Society, AAS Meeting #211, #58.15; Bulletin of the American Astronomical Society, Vol. 39, p.836

Astronomy and Astrophysics

Astronomy

Scientific paper

M67 served as a primary calibration field for The Two Micron All Sky Survey with a one-degree by 8.5' region centered on the cluster being observed more than 3000 times. Treating these J, H, Ks observations individually produces a set of exquisitely precise colors and magnitudes enabling membership and binarity determination as well as exact relative spectral type discrimination. Stacking the ensemble of observations provides a deep image enabling reliable source extraction to Ks>19. Spitzer 4-band IRAC observations have been conducted for a field overlapping the 2MASS calibration coverage. This contribution reports mid-infrared photometry sorted by spectral type of this well-studied coeval solar-metallicy solar-age population. Fluxes from the individual 2MASS calibration observations were collected from the 2MASS Extended Mission data release. Fluxes from the deep 2MASS calibration co-add images and from the 4-bands of Spitzer IRAC frames were optimally extracted by a PSF-fitting algorithm that worked simultaneously on the combined 7-band dataset.

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