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J/A+A/601/A69           MWC 922 XSHOOTER spectra                 (Wehres+, 2017)

Medium resolution echelle spectroscopy of the Red Square Nebula, MWC 922. Wehres N., Ochsendorf B.B., Tielens A.G.G.M., Cox N.L.J., Kaper L., Bally J., Snow T.P. <Astron. Astrophys. 601, A69 (2017)> =2017A&A...601A..69W (SIMBAD/NED BibCode)
ADC_Keywords: Nebulae ; Stars, emission ; Spectroscopy Keywords: astrochemistry - methods: observational - techniques: spectroscopic - stars: emission-line, Be - circumstellar matter - ISM: abundances Abstract: Medium-resolution echelle spectra of the Red Square Nebula surrounding the star MWC 922 are presented. The spectra have been obtained in 2010 and 2012 using the XSHOOTER spectrograph mounted on the Very Large Telescope (VLT) in Paranal, Chile. The spectrum covers a wavelength range between 300nm-2.5um and shows that the nebula is rich in emission lines. We aim to identify the emission lines and use them as a tool to determine the physical and chemical characteristics of the nebula. The emission lines are also used to put constraints on the structure of the nebula and on the nature of the central stars. We analyzed and identified emission lines that indicated that the Red Square Nebula consists of a low density bipolar outflow, eminent in the broad emission component seen in [FeII], as well as in P Cygni line profiles indicative of fast outflowing material. The narrow component in the [FeII] lines is most likely formed in the photosphere of a surrounding disk. Some of the emission lines show a pronounced double peaked profile, such as CaII, indicating an accretion disk in Keplerian rotation around the central star. [OI] emission lines are formed in the neutral atomic zone separating the ionized disk photosphere from the molecular gas in the interior of the disk, which is prominent in molecular CO emission in the near-IR. [NII] and [SII] emission clearly originates in a low density but fairly hot (7000-10000K) nebular environment. HI recombination lines trace the extended nebula as well as the photosphere of the disk. Description: XSHOOTER fully data reduced spectra, including the UV, VIS and NIR spectra. Objects: ------------------------------------------------------------ RA (2000) DE Designation(s) ------------------------------------------------------------ 18 21 16.06 -13 01 25.7 MWC 922 = NAME Red Square Nebula ------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file uvb_flux.dat 23 19407 MWC 922 UVB spectrum vis_flux.dat 23 32423 MWC 922 VIS spectrum nir_flux.dat 23 49499 MWC 922 NIR spectrum
Byte-by-byte Description of file: uvb_flux.dat vis_flux.dat nir_flux.dat
Bytes Format Units Label Explanations
1- 10 F10.5 nm lambda Wavelength 12- 23 E12.6 10mW/m2/nm/arcsec2 Flux Flux (in erg/s/cm2/Å/arcsec2
Acknowledgements: Nadine Wehres, wehres(at)ph1.uni-koeln.de
(End) Patricia Vannier [CDS] 05-Apr-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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