1999ApJ...517L.147N


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET05:47:19

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.

NEUFELD D.A., FEUCHTGRUBER H., HARWIT M. and MELNICK G.J.

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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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 V* VY CMa s*r 07 22 58.32877 -25 46 03.2355 12.01 10.19 7.95     M5Iae 1012 0
2 HD 302821 sg* 10 23 19.4807452802 -59 32 04.680572222   10.59 9.17     A7Ie 78 1
3 NGC 6302 PN 17 13 44.339 -37 06 10.95   7.1 10.10     ~ 761 1
4 HD 179821 pA* 19 13 58.6083165753 +00 07 31.934676028 10.81 9.694 8.19     G4_0-Ia 222 0
5 IRC +10420 pA* 19 26 48.0981288433 +11 21 16.756524951   13.98 11.66     F8Ia+e 454 0
6 NML Cyg s*r 20 46 25.5382179476 +40 06 59.396202678   18.64 16.60     M7/8 485 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-05:47:19

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