2003A&A...408..313K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET20:43:39

2003A&A...408..313K - Astronomy and Astrophysics, volume 408, 313-322 (2003/9-2)

VLT/ISAAC H-band spectroscopy of embedded massive YSOs.

KENDALL T.R., DE WIT W.J. and YUN J.L.

Abstract (from CDS):

We have performed intermediate resolution (R∼5000), high signal-to-noise H-band spectroscopy of a small, initial sample of three massive embedded young stellar objects (YSOs), using VLT/ISAAC. The sample has been selected from sources characterised in previous literature as being likely of OB spectral type, to be unambiguously associated with bright (H≤14) single point sources in the 2MASS database, and to have no optical counterparts. Of the targets observed, one object shows a ∼B3 spectrum, similar to a main sequence object of the same spectral type. A second object exhibits weak Hei and H emission, indicating an early-type source: we detect He ii absorption, which supports a previous indirect derivation of the spectral type as mid-O. The third object does not show absorption lines, so no spectral type can de derived. It does, however, exhibit a rich spectrum of strong, broad emission lines and is likely to be surrounded by dense circumstellar material and at a very early evolutionary stage. Our results from this very small sample are in agreement with those of Kaper et al. (2002 "The VLT View" Symp.), who also find spectra similar to optically visible main sequence stars, together with emission line objects representing a very early evolutionary phase, in their much larger sample of K-band spectra.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: early-type - ISM: HII regions

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NGC 6334 HII 17 20 51 -36 06.9           ~ 563 0
2 [HG83] IRS-I-4 IR 17 20 51 -35 46.3           ~ 4 0
3 [HG83] IRS-I-2 IR 17 20 53.1 -35 46 59           ~ 15 0
4 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 258 0
5 2MASS J17205343-3547022 * 17 20 53.432 -35 47 02.26           ~ 22 1
6 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 201 1
7 IRAS 17441-2910 HII 17 47 20.8 -29 11 57           ~ 31 0
8 IRAS 18079-1756 Y*O 18 10 51.09792 -17 55 49.6272           ~ 45 0

    Equat.    Gal    SGal    Ecl

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2019.12.07-20:43:39

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