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 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:
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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 1978PhS....18..217J)
* : Jaschek M. and Jaschek C. (1962PASP...74..151J 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