An Infrared Survey of RW Aurigae Stars

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Abstract
An infrared photometric survey of 89 RW Aur type variables in both hemispheres has been made. JHKL magnitudes and colours are listed. The RW Aur variables include a small number of highly reddened late-type stars. All T Tauri and hot Orion population stars show infrared excesses and the infrared properties mark certain field stars as being young. The greatest infrared excesses are found for A and F stars while young variable B stars usually show no excesses. The location of the RW Aur stars in the two-colour H−K , K−L diagram favour dust re-radiation over free-free emission as the mechanism responsible for the infrared excess. A weak correlation of H−K with emission class links the occurrence of circumstellar dust and gas shells.

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