Volume 427, Number 3, December I 2004
|Page(s)||849 - 853|
|Section||Interstellar and circumstellar matter|
|Published online||16 November 2004|
The nature of the KW object*
Astronomisches Institut der Ruhr-Universität Bochum, Universitätsstrasse 150/NA 7, 44780 Bochum, Germany e-mail: firstname.lastname@example.org
2 Institut für Astrophysik, Leopold-Franzens-Universität Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
3 European Southern Observatory, Karl-Schwarzschild-Strasse 2, 85748 Garching, Germany
Accepted: 2 August 2004
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 ( 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 – equivalent to a B0 star – surrounded by 10 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.
Key words: stars: formation / stars: circumstellar matter / stars: pre-main sequence / infrared: stars / Galaxy: open clusters and associations: general
© ESO, 2004
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.