J/A+A/526/A116 W Virginis high-resolution spectra (Kovtyukh+, 2011)
Neutral and ionized emission lines in the Type II Cepheid W Virginis
Kovtyukh V.V., Wallerstein G., Andrievsky S.M., Gillet D., Fokin A.B.,
Templeton M., Henden A.A.
<Astron. Astrophys. 526, A116 (2011)>
=2011A&A...526A.116K 2011A&A...526A.116K
ADC_Keywords: Stars, variable ; Spectroscopy
Keywords: stars: atmospheres - stars: variables: Cepheids
Abstract:
The aim of this work was to perform a multiphase spectroscopic study
of W Vir which represents stars of the class of Population II
cepheids, in order to trace the behaviour of emission features in
different lines, and to use the data to describe the dynamical
processes in the atmosphere of this star associated with the shock
wave propagation.
Description:
Our spectroscopic study of W Vir involved 18 high-resolution spectra
obtained with the help of 3.5-m telescope of Apache Point Observatory.
These spectra cover W Vir's pulsational cycle with good phase
resolution that enabled us to precisely fix the intervals of
appearance, existence and disappearance of many anomalous spectral
features, as well as to construct their radial velocity curves.
We detected and investigated the behaviour of emission and line
doubling in many metallic lines (NaI, FeI, FeII, BaII etc), as well as
in hydrogen and helium lines. Analysis of the temporal characteristics
of those emission features allowed us to make, in particular, the
following conclusion. W Vir consists of two parts: the inner part,
which is, in fact, a pulsating star itself with periodic shocks
penetrating into the upper atmosphere, an outer one - a circumstellar
envelope. The interaction of the main shock wave with the infalling
envelope layers can explain the observed peculiarities of the spectral
line variability.
Objects:
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RA (2000) DE Designation(s)
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13 26 02.0 -03 22 43 W Vir = HD 116802
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 52 196 Emission lines at phase φ=0.666
tablea1.tex 73 259 LaTeX version of tablea1
sp/020222.dat 16 54810 2002/02/22 spectrum
sp/020302.dat 16 52120 2002/03/02 spectrum
sp/060120.dat 16 54574 2006/01/20 spectrum
sp/060123.dat 16 56351 2006/01/23 spectrum
sp/060127.dat 16 52922 2006/01/27 spectrum
sp/060612.dat 16 56522 2006/06/12 spectrum
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda Wavelength
10- 14 A5 --- Ion Element
17- 20 I4 --- Mult ? Multiplet number
23- 25 I3 0.1pm EW Equivalent width
29- 32 F4.2 eV Elow Excitation potential for the lower level
35- 36 I2 --- glow Statistical weight for the lower level
39- 40 I2 --- gup Statistical weight for the upper level
43- 46 F4.2 eV Eup Excitation potential for the upper level
49- 52 F4.2 [-] logA Logarithm of the emission transition probability
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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3- 10 F8.3 0.1nm lambda Wavelength
12- 16 F5.3 --- RFlux Relative flux
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Acknowledgements:
V. Kovtyukh, val(at)deneb1.odessa.ua
(End) Patricia Vannier [CDS] 10-Jan-2011