Time-series Photometry of Stars in and around the Lagoon Nebula . I . Rotation Periods of 290 Low-mass Pre-main-sequence Stars in Ngc 6530

We have conducted a long-term, wide-field, high-cadence photometric monitoring survey of ∼50,000 stars in the Lagoon Nebula H ii region. This first paper presents rotation periods for 290 low-mass stars in NGC 6530, the young cluster illuminating the nebula, and for which we assemble a catalog of infrared and spectroscopic disk indicators, estimated masses… (More)