J/A+A/548/A13 HD 50138 short-term variability (Borges Fernandes+, 2012)
The Galactic unclassified B[e] star HD 50138.
III. The short-term line profile variability of its photospheric lines.
Borges Fernandes M., Kraus M., Nickeler D.H., De Cat P., Lampens P.,
Pereira C.B., Oksala M.E.
<Astron. Astrophys. 548, A13 (2012)>
=2012A&A...548A..13B 2012A&A...548A..13B
ADC_Keywords: Stars, variable ; Stars, Be ; Line Profiles ; Spectroscopy
Keywords: stars: oscillations - stars: mass-loss - stars: winds, outflows -
stars: winds, outflows - circumstellar matter -
stars: individual: HD 50138
Abstract:
HD 50138 presents the B[e] phenomenon, but its nature is not clear
yet. This star is known to present spectral variations, which have
been associated with outbursts and shell phases.
We analyze the line profile variability of HD 50138 and its possible
origin, which provide possible hints to its evolutionary stage, so far
said to be close to the end of (or slightly beyond) the main sequence.
Description:
A total of 72 files related to the optical spectra taken within 8
observing nights with HERMES spectrograph, covering the photospheric
HeI 4026Å and SiII 4128Å and 4131Å lines, the circumstellar
[OI] 6364Å line, and the lines formed in the upper layers of the
stellar atmosphere or very close to the stellar surface: SiII 6347Å
and 6371Å, HeI 6678Å, H10, H9 and Halpha lines. The data were
reduced by automated data reduction pipeline and cosmic ray and
heliocentric velocity corrected (but not telluric corrected).
Objects:
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RA (2000) DE Designation(s)
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06 51 33.40 -06 57 59.5 HD 50138 = V* V743 Mon
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 56 72 List of spectra
sp/* . 72 Individual spectrum
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See also:
J/A+A/508/309 : Spectral atlas of HD 50138 (Borges Fernandes+, 2009)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- FileName Name of the file with the spectrum,
in subdirectory sp
14- 17 I4 0.1nm lam.min Wavelength lower value
18 A1 --- --- [/]
19- 22 I4 0.1nm lam.max Wavelength upper value
24- 45 A22 --- Line Line identification
49- 58 A10 "YYYY/MM/DD" Obs.date Observation date
60 A1 --- --- [(]
61- 65 A5 "h:m" Obs.time UT Time of observation when more than
one at the same date
66 A1 --- --- [)]
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 7 F7.2 0.1nm lambda [3784/6685] Wavelength λ
9- 16 F8.5 --- Rflux Relative flux at λ
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Acknowledgements:
Marcelo Borges Fernandes, borges(at)on.br
References:
Borges Fernandes et al., Paper I, 2009A&A...508..309B 2009A&A...508..309B, Cat. J/A+A/508/309
Borges Fernandes et al., Paper II, 2011A&A...528A..20B 2011A&A...528A..20B
(End) M. Borges Fernandes [Observatorio Nacional], P. Vannier [CDS] 11-Oct-2012