Near-infrared observations of young stellar objects in the Rho Ophiuchi dark cloud

Astronomy and Astrophysics – Astronomy

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Interstellar Matter, Near Infrared Radiation, Pre-Main Sequence Stars, Sky Surveys (Astronomy), Star Clusters, Color-Color Diagram, Stellar Envelopes, Stellar Evolution, Stellar Luminosity

Scientific paper

We have conducted an imaging survey of 1.4 sq pc of the Rho Ophiuchi dark cloud in the J, H, and K near-infrared photometric bands. Approximately 337 of our 481 detected sources are associated with the cloud, and we estimate that 48 percent of these have near-infrared excesses, indicative of disks or circumstellar material surrounding these young stellar objects (YSOs). The K-band luminosity function is significantly different in different regions of our survey area, suggesting that YSOs in these regions have different ages or mass functions. We estimate that the entire survey area has a high star-formation efficiency, at roughly 23 percent. Finally, our many newly detected sources provide a relatively large, uniformly sensitive sample of objects for study at longer wavelengths to better determine true source luminosities and evolutionary lifetimes.

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