J/A+A/568/L13 K-band spectrum of the very massive star W49nr1 (Wu+, 2014)
The discovery of a very massive star in W49.
Wu S., Bik A., Henning T., Pasquali A., Brandner W., Stolte A.
<Astron. Astrophys. 568, L13 (2014)>
=2014A&A...568L..13W 2014A&A...568L..13W
ADC_Keywords: Clusters, open ; Stars, supergiant ; Photometry, infrared
Keywords: stars: formation - stars: massive - stars: supergiants -
infrared: stars - techniques: spectroscopic -
open clusters and associations: individual: W49
Abstract:
Very massive stars (M>100M☉) are very rare objects, but have a
strong influence on their environment. The formation of this kind of
objects is of prime importance in star formation, but observationally
still poorly constrained.
We report on the identification of a very massive star in the central
cluster of the star-forming region W49.
We investigate near-infrared K-band spectroscopic observations of W49
from VLT/ISAAC together with JHK images obtained with NTT/SOFI and
LBT/LUCI. We derive a spectral type of W49nr1, the brightest star in
the dense core of the central cluster of W49.
Description:
A medium-resolution (R=10,000) K-band spectrum of W49nr1 was obtained
with ISAAC mounted on Antu (UT1) of ESO's Very Large Telescope
(VLT), Paranal, Chile. J- and H-band images were obtained with SOFI at
the New Technology Telescope (NTT), La Silla, Chile and a K- band
image was acquired with LUCI mounted on the Large Binocular Telescope
(LBT), Mount Graham, Arizona.
Objects:
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RA (2000) DE Designation(s)
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19 10 17.43 +09 06 20.93 W49nr1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 97 1 Information on spectrum file
w49nr1Kb.fits 2880 15 Spectrum FITS file
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 9 F9.5 deg RAdeg Right ascension (J2000)
10- 17 F8.5 deg DEdeg Declination (J2000)
19- 25 F7.1 0.1nm lam.min [20770.3] Lower value of wavelength interval
27- 33 F7.1 0.1nm lam.max [22026.5] Upper value of wavelength interval
35- 41 F7.5 0.1nm dlam [1.22796] Spectral resolution
43- 46 I4 --- Nx [1024] Number of measurements
48- 49 I2 Kibyte size [42] Size of FITS file
51- 64 F14.8 d MJD Observation date
66- 78 A13 --- FileName Name of the FITS file
80- 97 A18 --- Title Title of the file
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Acknowledgements:
Shiwei Wu, shiwei(at)mpia.de
(End) Patricia Vannier [CDS] 25-Jul-2014