J/A+A/571/L4 MWC 349A Halpha lines with 14<n<24 spectra (Beaz-Rubio+, 2014)
Origin of the ionized wind in MWC 349A.
Beaz-Rubio A., Martin-Pintado J., Thum C., Planesas P., Torres-Redondo J.
<Astron. Astrophys. 571, L4 (2014)>
=2014A&A...571L...4B 2014A&A...571L...4B
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, CCD
Keywords: stars: massive - masers - HII regions - stars: winds, outflows -
accretion, accretion disks
Abstract:
The UC-HII region of MWC 349A is the prototype of an ionized wind
driven by a massive star surrounded by a disk. Recent high angular
resolution observations of the millimeter recombination lines have
shown that the disk rotates with a Keplerian law in its outer parts.
However, the kinematics of innermost regions in the UC-HII region of
MWC 349A is still unknown, in particular the radius where the wind is
launched from the disk. We performed hydrogen recombination line
observations with the Heterodyne Instrument for the Far Infrared
(HIFI) onboard the Herschel Space Observatory to study the kinematics
of its innermost regions by studying their spectral features. In
addition to the two laser peaks, we report the first detection of two
new components that are blueshifted with respect to the laser peaks
for all the recombination lines with principal quantum number n<22.
These new spectral features originate from the region where the wind
is ejected from the disk. We used our 3D non-LTE radiative transfer
model for recombination lines (MORELI) to show that these features are
consistent with the wind being ejected at a radius of about 24 AU from
the star, which supports magnetohydrodynamic wind models.
Description:
The HIFI profiles for Hnα recombination lines with 14<n<24
detected toward MWC349A are contained in the FITS files. Intensities
are in units of Jy.
Objects:
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RA (2000) DE Designation(s)
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20 32 45.53 +40 39 36.6 MWC 349A = EM* MWC 349A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 132 9 List of FITS spectra
fits/* . 9 Individual FITS spectra
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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 of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 23 I4 --- Nx [642/8273] Number of pixels along X-axis
25- 43 A19 "datime" ObsDate Observation date (YYYY-MM-DDThh:mm:ss:sss)
45- 54 F10.5 GHz Freq [507/1770] Line frequency
56- 62 F7.1 km/s bVel [-1902/-200] Lower value of velocity window
64- 69 F6.1 km/s BVel [130/800] Upper value of velocity window
72- 76 F5.3 km/s dVel [0.08/1] Velocity spacing (channel width)
79- 80 I2 Kibyte size [8/39] Size of FITS file
82- 94 A13 --- FileName Name of FITS file, in subdirectory fits
96-132 A37 --- Title Title of the file
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Acknowledgements:
Alejandro Beaz-Rubio, baezra(at)cab.inta-csic.es
(End) Patricia Vannier [CDS] 28-Oct-2014