A Multi-Color Optical Survey of the Orion Nebula Cluster. Part I: the Catalog
Nicola Da Rio (1), Massimo Robberto (2), David R. Soderblom (2), Nino, Panagia (2,3,4), Lynne A. Hillenbrand (5), Francesco Palla (6), Keivan, Stassun (7) ((1) Max Planck Institut f\"ur Astronomie, (2) Space Telescope, Science Institute

TL;DR
This paper provides a comprehensive optical photometric catalog of the Orion Nebula Cluster, including new classifications and Halpha measurements, enabling detailed analysis of its pre-main sequence stellar population.
Contribution
It presents a large, multi-band photometric catalog with new spectral classifications and Halpha excess measurements for stars in the ONC, facilitating future detailed studies.
Findings
Catalog of 2,612 sources with multi-band photometry
Spectro-photometric TiO index correlates with spectral type
Largest Halpha star catalog for the ONC to date
Abstract
We present U, B, V, I broad-band, 6200A TiO medium-band and Halpha photometry of the Orion Nebula Cluster obtained with the WFI imager at the ESO/MPI 2.2 telescope. The nearly-simultaneous observations cover the entire ONC in a field of about 34x34 arcmin. They enable us to determine stellar colors avoiding the additional scatter in the photometry induced by stellar variability typical of pre-main sequence stars. We identify 2,612 point-like sources in I band, 58%, 43% and 17% of them detected also in V, B and U, respectively. 1040 sources are identified in Halpha band. In this paper we present the observations, the calibration techniques, and the resulting catalog. We show the derived CMD of the population and discuss the completeness of our photometry. We define a spectro-photometric TiO index from the fluxes in V, I, and TiO-band. We find a correlation between the index and the…
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