J/ApJS/186/175 Far-UV spectroscopic atlas of B stars (Smith, 2010)
A detailed far-ultraviolet spectral atlas of main-sequence B stars.
Smith M.A.
<Astrophys. J. Suppl. Ser., 186, 175-190 (2010)>
=2010ApJS..186..175S 2010ApJS..186..175S
ADC_Keywords: Atlases ; Spectra, ultraviolet ; Stars, B-type ; Line Profiles
Keywords: atlases - line: identification - stars: early-type
ultraviolet: stars
Abstract:
We have constructed a detailed spectral atlas covering the wavelength
region 930-1225Å for 10 sharp-lined B0-B9 stars near the main
sequence. Most of the spectra we assembled are from the archives of
the Far Ultraviolet Spectroscopic Explorer satellite, but for nine
stars, wavelength coverage above 1188Å was taken from
high-resolution International Ultraviolet Explorer or echelle Hubble
Space Telescope/Space Telescope Imaging Spectrograph spectra. To
represent the tenth star at type B0.2V, we used the Copernicus atlas
of tau Sco. We made extensive line identifications in the region
949-1225Å of all atomic features having published oscillator
strengths at types B0, B2, and B8. These are provided as a
supplementary data product-hence the term detailed atlas. Our list
of found features totals 2288, 1612, and 2469 lines, respectively. We
were able to identify 92%, 98%, and 98% of these features with known
atomic transitions with varying degrees of certainty in these spectra.
The remaining lines do not have published oscillator strengths.
Photospheric lines account for 94%, 87%, and 91%, respectively, of all
our identifications, with the remainder being due to interstellar
(usually molecular H2) lines. We also discuss the numbers of lines
with respect to the distributions of various ions for these three most
studied spectral subtypes. A table is also given of 162 least blended
lines that can be used as possible diagnostics of physical conditions
in B star atmospheres.
Description:
Data reprocessings of IUE and STIS echelle spectra were completed in
1997 and 2006, respectively. The FUSE data were reprocessed with
CalFUSE version 3.2 (Dixon et al., 2007PASP..119..527D 2007PASP..119..527D) during
2007-2008. These spectra were ingested into the MAST archive, and we
retrieved them from this facility.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 54 10 Star sample
tableb0.dat 44 2289 Line identifications in B0 spectra
tableb2.dat 44 1612 Line identifications in B2 spectra
tableb8.dat 44 2468 Line identifications in B8 spectra
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See also:
VI/129 : The FUSE Observation Log (FUSE, 1999-2007)
III/188 : IUE Atlas of B-Type Stellar Spectra (Walborn+ 1995)
http://archive.stsci.edu : Mutimission Archive at STScI (MAST) homepage
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name for which FUSE spectra were used
10- 11 A2 --- f_Name [*C ] Flag on object (1)
13- 20 A8 --- SpT MK Spectral type
22- 25 F4.2 --- E(B-V) ? Interstellar reddening
27- 31 I5 K Teff Effective temperature
33- 41 A9 --- SStar Name of star when a HST/STIS or IUE spectrum
was used. See section 2.2 for further details.
42 A1 --- f_SStar [*] Flag on the second star (1)
44- 48 A5 --- SpT2 MK Spectral type of the second star
50- 54 I5 K Teff2 ? Effective temperature of the second star
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Note (1): Flags as follows:
* = stars for which spectral templates were adopted to identify atomic and
ISM lines.
C = exclusive use of the Copernicus atlas data (Rogerson et al.,
1977STIN...7820024R 1977STIN...7820024R) for tau Sco (not FUSE).
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Byte-by-byte Description of file: tableb*.dat
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Bytes Format Units Label Explanations
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2- 4 I3 --- fSp Presence of line in B0(1), B2(2), B8
9- 16 F8.3 0.1nm lambda1 ? B0, B2 or B8 primary wavelength (1)
21- 28 F8.3 0.1nm lambda2 ? Secondary (member) wavelength (1)
33- 38 A6 --- Ion Ion identification ("UN" for unknown)
39 A1 --- u_Ion Uncertainty flag (:) on ion identification
41- 44 A4 --- ISM "ISM" for interstellar line, "pISM" for
lines that may appear in photosphere and ISM.
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Note (1): only one of the columns is filled: the line is either the
primary or member of a line group.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Apr-2010