J/A+A/382/184 Crystalline silicates around evolved stars (Molster+, 2002)
Crystalline silicate dust around evolved stars.
I. The sample stars.
Molster F.J., Waters L.B.F.M., Tielens A.G.G.M., Barlow M.J.
<Astron. Astrophys. 382, 184 (2002)>
=2002A&A...382..184M 2002A&A...382..184M
ADC_Keywords: Stars, giant ; Planetary nebulae ; Mass loss ; Spectra, infrared
Keywords: infrared: stars - circumstellar matter - stars: AGB and post-AGB -
mass loss - planetary nebulae: general - dust, extinction
Abstract:
This is the first paper in a series of three where we present the
first comprehensive inventory of solid state emission bands observed
in a sample of 17 oxygen-rich circumstellar dust shells surrounding
evolved stars. The data were taken with the Short and Long Wavelength
Spectrographs on board of the Infrared Space Observatory (ISO) and
cover the 2.4 to 195µm wavelength range. The spectra show the
presence of broad 10 and 18µm bands that can be attributed to
amorphous silicates. In addition, at least 49 narrow bands are found
whose position and width indicate they can be attributed to
crystalline silicates. Almost all of these bands were not known before
ISO.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 51 17 Star positions (from Simbad)
table4.dat 60 36 IRAS 09425-6040 measured IR spectral features
table5.dat 60 47 NGC 6537 measured IR spectral features
table6.dat 60 42 NGC 6302 measured IR spectral features
table7.dat 60 64 MWC 922 measured IR spectral features
table8.dat 60 40 AC Her measured IR spectral features
table9.dat 60 46 HD 45677 measured IR spectral features
table10.dat 60 28 89 Her measured IR spectral features
table11.dat 60 35 MWC 300 measured IR spectral features
table12.dat 60 50 HD 44179 measured IR spectral features
table13.dat 60 27 Roberts 22 measured IR spectral features
table14.dat 60 18 *VY 2-2 measured IR spectral features
table15.dat 60 38 HD 161796 measured IR spectral features
table16.dat 60 35 OH 26.5+0.6 measured IR spectral features
table17.dat 60 33 HD 179821 measured IR spectral features
table18.dat 60 36 AFGL 4106 measured IR spectral features
table19.dat 60 30 NML Cyg measured IR spectral features
table20.dat 60 37 IRC+10420 measured IR spectral features
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Note on table14.dat: Because of the uncertainty of the continuum in VY2-2 at the
LWS wavelengths (>45µm) no I(peak)/I(cont) is given for these features.
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See also:
J/A+A/293/833 : Circumstellar silicate grains (David+, 1995)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- tno Table number for the star data
4- 18 A15 --- Name Star name
20- 21 I2 h RAh Right ascension (J2000.0)
23- 24 I2 min RAm Right ascension (J2000.0)
26- 29 F4.1 s RAs Right ascension (J2000.0)
31 A1 --- DE- Declination sign (J2000.0)
32- 33 I2 deg DEd Declination (J2000.0)
35- 36 I2 arcmin DEm Declination (J2000.0)
38- 39 I2 arcsec DEs Declination (J2000.0)
42- 51 A10 --- OName Other name
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Byte-by-byte Description of file: table*.dat
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Bytes Format Units Label Explanations
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1- 5 F5.2 um lambda Wavelength of the feature
9- 12 F4.2 um e_lambda Error on the wavelength (1 σ)
14- 18 F5.2 um FWHM FWHM of the feature
22- 25 F4.2 um e_FWHM Error on the FWHM (1 σ)
28- 32 F5.3 --- I(p)/I(c) ?=0.000 I(peak)/I(cont)
35- 39 F5.3 --- e_I(p)/I(c) ?=0.000 Error on the I(peak)/I(cont) (1σ)
43- 50 E8.2 W/m2 F(band) Flux in the band (negative is absorption)
54- 59 E6.2 W/m2 e_F(band) Error on the Flux in the band (1 σ)
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Acknowledgements: Frank Molster
References:
Waters et al., 1998A&A...331L..61W 1998A&A...331L..61W
(End) Frank Molster [ESA/ESTEC], Patricia Bauer [CDS] 16-Nov-2001