J/A+A/425/263 Spectroscopic atlas of HD175640 (Castelli+, 2004)
A spectroscopic atlas of the HgMn star HD 175640 (B9 V)
λλ 3040-10000Å.
Castelli F., Hubrig S.
<Astron. Astrophys., 425, 263-270 (2004)>
=2004A&A...425..263C 2004A&A...425..263C
ADC_Keywords: Atlases ; Stars, Bp ; Abundances ; Models, atmosphere
Keywords: stars: abundances - line: identification - atomic data -
stars: atmospheres - stars: chemically peculiar -
stars: individual: HD 175640 (B9V)
Abstract:
We present a high resolution spectral atlas of the HgMn star HD 175640
covering the 3040-10000Å region. UVES spectra observed with
90000-110000 resolving power and signal to noise ratio ranging from
200 to 400 are compared with a synthetic spectrum computed with the
SYNTHE code (Kurucz, 1993, CD-ROM, No. 18). The model atmosphere is an
ATLAS12 model (Kurucz, 1997, in The 3rd Conf. on Faint Blue Stars, ed.
Philip, Liebert & Saffer (Schenectady: L. Davis Press), 33) with
parameters Teff=12000K,logg=3.95, vturb=0km/s. The stellar individual
abundances in ATLAS12 were derived from an iterative procedure. The
starting atomic line lists downloaded from the Kurucz website have
been improved and extended by examining different sources in the
literature and by comparing the computed profiles with the observed
spectrum. The high quality of the data allowed us to study the
isotopic and hyperfine structure for several lines of Mn II, Ga II,
Ba II, Pt II, Hg I, and Hg II. Numerous weak emission lines from Cr II
and Ti II have been identified in the red part of the spectrum,
starting at about 5847Å. Two emission lines of C I (mult. 10, mult.
9) have been observed for the first time. All Cr II and Ti II emission
lines originate from the high excitation states (Elow>89000cm-1 for
Cr II and Elow>62000cm-1 for Ti II) with large transition
probabilities (loggf>-1.00). The synthetic spectrum superimposed on
the observed spectrum are available at
http://wwwuser.oat.ts.astro.it/castelli/stars.html .
An extended discussion on each identified ion and related atomic data
is available both in the quoted website and in an electronic Appendix
to the paper.
Description:
The spectrum of HD 175640 was observed at ESO with the VLT UV-Visual
Echelle Spectrograph UVES at 90000 and 110000 resolving power
shortward and longward of the Balmer discontinuity, respectively. It
covers the region 3040-10000Å, with two gaps at 5759-5835Å and
8519-8656Å. Furthermore, the 9074-9098Å range cannot be used, as
the spectrum quality is poor in this interval. The file "obsspect.dat"
is the observed spectrum normalized to the continuum level and shifted
to the laboratory wavelength scale. It covers the region 3040-10000A
with gaps at 5759-5835Å, 8519-8656Å, and 9074-9098Å.
The synthetic spectrum of HD 175640 was computed with the SYNTHE code
from Kurucz and with an opacity sampling ATLAS12 model atmosphere
computed for the individual abundances of the star. The file
"synspect.dat" is the synthetic spectrum for the whole interval
3000-10000Å.
The Kurucz database (http://kurucz.harvard.edu/linelists/gf100) has
provided the basis for the atomic line data. We implemented the files
gf0400.100, gf0500.100,gf0600.100, gf0800.100, and gf1200.100 by
replacing several loggfs with more up-to-date determinations and by
adding missing lines, Stark broadening parameters, and hyperfine and
isotopic components. The files gf0400new.100, gf0500new.100,
gf0600new.100, gf0800new.100, and gf1200new.100 are the modified files
used for computing the synthetic spectrum.
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s)
----------------------------------------------------------
18 56 22.7 -01 48 00 HD 175640
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File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
obsspect.dat 23 305302 Observed spectrum of HD 175640
synspect.dat 22 602486 Synthetic spectrum for HD 175640
linelist.txt 160 78 Description of the files gf/* used for synthetic
spectrum data
gf/* . 5 Atomic line data
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See also:
http://wwwuser.oat.ts.astro.it/castelli/stars.html : Atlas HomePage
http://kurucz.harvard.edu/linelists.html : Kurucz/Linelists HomePage
III/232 : STELIB: A library of stellar spectra at R∼2000 (Le Borgne+, 2003)
Byte-by-Byte Description of file: obsspect.dat synspect.dat
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Bytes Format Units Label Explanations
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2- 11 F10.4 0.1nm Lambda Wavelength
14- 23 F10.4 --- Flux Flux normalized to the continuum level
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Acknowledgements: Fiorella Castelli, castelli(at)ts.astro.it
(End) Patricia Vannier [CDS] 08-Nov-2004