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J/A+AS/120/99       Spectroscopy of MWC 645                     (Jaschek+, 1996)
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B[e] stars. III. MWC 645
       Jaschek M., Andrillat Y., Jaschek C.
      <Astron. Astrophys. Suppl. Ser. 120, 99 (1996)>
      =1996A&AS..120...99J      (SIMBAD/NED BibCode)
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ADC_Keywords: Equivalent widths ; Spectra, infrared ; Stars, emission
Keywords: stars: emission line, Be - stars: variables: others  - stars: MWC 346A

Description:
    We analyse spectroscopic CCD material obtained at the Haute Provence
    Observatory. We provide identifications and equivalent width
    measurements in the wavelength region 3740-8790. About 350 emissions
    lines were measured and about 88 of them were identified. A comparison
    of our results with those of other authors is provided, as well as a
    table of elements identified in the spectrum of this star.
    The pattern of elements present is analogous to that of a late B-type
    star, but some exceptions are noted, such as the absence of Ne and Mg
    lines and the presence of K, Cu and Zr lines which appear usually in
    later type stars. We review the little which is known concerning this
    object and we also present a quantitative account of the variations in
    equivalent widths. The observations indicate that the spectrum is
    highly variable, so that in two different years only half of the lines
    appear on both spectra. Furthermore variations by at least a factor of
    two in the equivalent widths are present in many lines. The radial
    velocity derived from the emission lines (-76km/s) corresponds to that
    of the shell which probably has a velocity of about 50km/s with
    respect to the underlying star.

Objects:
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       RA   (2000)   DE    Designation(s)
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      21 53 29   +52 59.9  MWC 645
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File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2             82      368   Line identifications in the spectrum of MWC 645
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See also:
   J/A+AS/117/281 : B[e] stars. I. HD 51585 (= OY Gem)
   J/A+AS/118/495 : B[e] stars. II. MWC 349 A
   J/A+AS/124/441 : B[e] stars. IV. MWC 142
   J/A+AS/128/475 : B[e] stars. V. MWC 158
   J/A+AS/131/479 : B[e] stars. VI. MWC 297

Byte-by-byte Description of file: table2
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   Bytes Format Units   Label    Explanations
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   1-  4  I4    ---     Mat      Material year
   6- 12  F7.2  0.1nm   Lambda   Laboratory wavelength
      13  A1    ---   n_Lambda   [&] & when coupled with the following Lambda
      15  A1    ---     Spect    Spectrum identification (see table1)
  17- 22  F6.2  0.1nm   EW       ? Equivalent width of the line, for Spect (1)
  23- 26  A4    ---   n_EW       Note on EW (2)
  28- 82  A55   ---     Ident    Line identification of the order element
                                  ionization stage and multiplet number (3)
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Note (1): A blank indicates that the line is present but has not been measured
          A blank followed by a dash indicates the absence of the line
           on this particular plate
Note (2): +p : refers to the preceding line
          +f : refers to the following line
          -  : indicates the absence of the line on this particular plate
          :  : indicates a uncertain value
Note (3):    J stands for Johansson (1978PhS....18..217J)
             * : Jaschek M. and Jaschek C. (1962PASP...74..151J)
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Table 1. Observational data
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         Date     Wavelength   Code
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       22-06-95   3741-4195    i
       22-06-95   4138-4592    j
       25-10-91   4286-4725    a
       25-07-93   4554-5006    b
       25-10-91   4697-5137    c
       20-06-95   6332-6780    d
       18-06-94   7008-7450    e
       18-08-91   7590-8014    f
       23-07-93   7983-8420    g
       17-08-91   8370-8790    h
      --------------------------------
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(End)                                         Patricia Bauer [CDS]   02-Aug-1996