Catalog of 563 stars in the Galactic Center

We measure the photometry of 563 stars using the Keck II Near Infrared Camera 2 (NIRC2) imager (K'-band, {lambda}_0_=2.124{mu}m). We achieve a photometric uncertainty floor of {Delta}m_K'_~0.03 (~3%), comparable to the highest precision achieved in other AO studies.

Approximately half of our sample (50%{+/-}2%) shows variability: 52%{+/-}5% of known early-type young stars and 43%{+/-}4% of known late-type giants are variable. These variability fractions are higher than those of other young, massive star populations or late-type giants in globular clusters, and can be largely explained by two factors. First, our experiment time baseline is sensitive to long-term intrinsic stellar variability.