J/A+A/542/A57 Six year spectroscopy of V2028 Cyg (Polster+, 2012)
Time-dependent spectral-feature variations of stars displaying the B[e]
phenomenon. I. V2028 Cyg.
Polster J., Korcakova D., Votruba V., Skoda P., Slechta M., Kucerova B.,
Kubat J.
<Astron. Astrophys. 542, A57 (2012)>
=2012A&A...542A..57P 2012A&A...542A..57P
ADC_Keywords: Binaries, spectroscopic ; Stars, Be ; Line Profiles
Keywords: line: profiles - binaries: general - circumstellar matter -
stars: emission-line, Be - stars: individual: V2028 Cyg
Abstract:
We present results of nearly six years long spectroscopic observations
of the B[e] star V2028 Cyg. The presence of the cold type absorption
lines combined with the hot type spectrum indicate a binarity of this
object. Since the B[e] stars are embedded in an extended envelope, the
usage of common stellar atmosphere models for the analysis is not very
appropriate. Therefore we focus on the analysis of the long term
spectral line variations in order to determine the nature of this
object. We present time dependencies of the equivalent width and
radial velocities of the Hα line, [OI] 6300Å, FeII 6427,
6433, and 6456Å lines. The bisector variations and line intensities
are shown for the Hα line. The radial velocities are also
measured for the absorption lines of the K component. No periodic
variation was found. The observed data show correlations between the
measured quantities, which can be used for the future modelling.
Description:
The spectra were obtained with the 2m telescope located at the
Ondrejov observatory, Czech Republic. We collected 88 spectra around
the Hα line during 45 nights over nearly six years (December 1,
2004 - October 8, 2010). The wavelength interval in these spectra
covers 625-677nm. The resolving power is R∼12500. Three additional
spectral intervals were observed: 752-803nm (even spectra), 770-821nm
(three spectra), and 820-870nm (three spectra).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 31 104 List of the spectra
spectra/* . 104 Individual spectra
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- FileName Name of the spectrum file
10- 23 F14.6 d JD Julian date
25- 31 A7 nm Interval Wavelength interval
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Byte-by-byte Description of file: spectra/*
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Bytes Format Units Label Explanations
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1- 16 F16.12 nm lambda Wavelength
18- 27 F10.7 --- Flux Relative flux
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Acknowledgements:
Jan Polster, jpolster(at)email.cz
(End) Patricia Vannier [CDS] 15-May-2012