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J/A+AS/120/99       Spectroscopy of MWC 645 (Jaschek+, 1996)

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)
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: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 21 53 29 +52 59.9 MWC 645 ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2 82 368 Line identifications in the spectrum of MWC 645
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
Bytes Format Units Label Explanations
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)
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) -------------------------------------------------------------------------------- Table 1. Observational data ------------------------------ Date Wavelength Code ------------------------------ 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 --------------------------------

(End) Patricia Bauer [CDS] 02-Aug-1996
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