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J/A+A/382/184     Crystalline silicates around evolved stars    (Molster+, 2002)
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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
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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 195{mu}m wavelength range. The spectra show the
    presence of broad 10 and 18{mu}m 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 (>45{mu}m) 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: table4.dat, table5.dat, table6.dat, table7.dat
Byte-by-byte Description of file: table8.dat, table9.dat, table10.dat
Byte-by-byte Description of file: table11.dat, table12.dat, table13.dat
Byte-by-byte Description of file: table14.dat, table15.dat, table16.dat
Byte-by-byte Description of file: table17.dat, table18.dat, table19.dat
Byte-by-byte Description of file: table20.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 {sigma})
 14- 18  F5.2  um      FWHM      FWHM of the feature
 22- 25  F4.2  um    e_FWHM      Error on the FWHM (1 {sigma})
 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) (1{sigma})
 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 {sigma})
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Acknowledgements: Frank Molster <fmolster@estec.esa.nl>

References:
    Waters et al., 1998A&A...331L..61W
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(End)               Frank Molster [ESA/ESTEC], Patricia Bauer [CDS]  16-Nov-2001