The nature of the KW object

Details The nature of the KW object The nature of the KW object

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...427..849c&link_type=abstract

Astronomy and Astrophysics, v.427, p.849-853 (2004)

Astronomy and Astrophysics

Astrophysics

9

Stars: Formation, Stars: Circumstellar Matter, Stars: Pre-Main Sequence, Infrared: Stars, Galaxy: Open Clusters And Associations: General

Scientific paper

The KW object, which has been one of the most puzzling infrared sources for three decades, has been resolved into a system of two early B-type stars with a projected separation of 2600 AU. While the more luminous component shows a huge IR excess due to circumstellar dust, the fainter one displays X-ray emission. The system is deeply embedded (AV ˜ 24 mag) in the molecular cloud M 17 SW and associated with an IR reflection nebula. A radiative transfer model of the spectral energy distribution of the IR excess object requires a stellar source of 5.1 × 103 L&sun; - equivalent to a B0 star - surrounded by 10 M&sun; of circumstellar material. The KW object is associated with a small cluster of about 150 red stars. The stellar density within 0.1 pc is >2.4 × 103 pc-3. From all new evidence we suggest that the KW object is one of the youngest, most deeply embedded Herbig Be stars known to date.
Based on observations collected at the European Southern Observatory, La Silla, Chile.

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