SIMBAD references

1999ApJ...517L.147N - Astrophys. J., 517, L147-L150 (1999/June-1)

Infrared space observatory observations of far-infrared rotational emission lines of water vapor toward the supergiant star VY Canis Majoris.


Abstract (from CDS):

We report the detection of numerous far-infrared emission lines of water vapor toward the supergiant star VY Canis Majoris. A 29.5-45 µm grating scan of VY CMa, obtained using the Short-Wavelength Spectrometer (SWS) of the Infrared Space Observatory at a spectral resolving power λ/Δλ of ∼2000, reveals at least 41 spectral features due to water vapor that together radiate a total luminosity of ∼25 L. In addition to pure rotational transitions within the ground vibrational state, these features include rotational transitions within the (010) excited vibrational state. The spectrum also shows the 2Π1/2(J=5/2)⟵2Π3/2(J=3/2) OH feature near 34.6 µm in absorption. Additional SWS observations of VY CMa were carried out in the instrument's Fabry-Perot mode for three water transitions: the 725-616 line at 29.8367 µm, the 441-312 line at 31.7721 µm, and the 432-303 line at 40.6909 µm. The higher spectral resolving power λ/Δλ of approximately 30,000 thereby obtained permits the line profiles to be resolved spectrally for the first time and reveals the ``P Cygni'' profiles that are characteristic of emission from an outflowing envelope.

Abstract Copyright:

Journal keyword(s): Stars: Circumstellar Matter - Infrared: Stars - Molecular Processes - Stars: Abundances - Stars: Individual: Constellation Name: VY Canis Majoris - Stars: Supergiants

Simbad objects: 6

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