2004A&A...427..849C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET02:33:29

2004A&A...427..849C - Astronomy and Astrophysics, volume 427, 849-853 (2004/12-1)

The nature of the KW object.

CHINI R., HOFFMEISTER V.H., KAEMPGEN K., KIMESWENGER S., NIELBOCK M. and SIEBENMORGEN R.

Abstract (from CDS):

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 2600AU. 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∼24mag) in the molecular cloud M17SW 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 5.1x103L - equivalent to a B0 star - surrounded by 10M 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 >2.4x103pc–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.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: circumstellar matter - stars: pre-main sequence - infrared: stars - Galaxy: open clusters and general associations

Nomenclature: Fig.1, Table 1: [CHK2004] KW N (Nos 1-2).

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 MSX5C G014.9957-00.6735 IR 18 20 19.7 -16 13 31           ~ 37 2
2 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 254 0
3 [CHK2004] KW 1 * ~ ~           ~ 3 1
4 [CHK2004] KW 2 * ~ ~           ~ 3 1

    Equat.    Gal    SGal    Ecl

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2021.03.08-02:33:29

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