J/AJ/140/1758 Spectral atlas of peculiar stars (Tomasella+, 2010)
A high-resolution, multi-epoch spectral atlas of peculiar stars including
RAVE, Gaia, and HERMES wavelength ranges.
Tomasella L., Munari U., Zwitter T.
<Astron. J. 140, 1758 (2010)>
=2010AJ....140.1758T 2010AJ....140.1758T
ADC_Keywords: Stars, peculiar ; Atlases ; Spectroscopy
Keywords: atlases - stars: general - stars: peculiar -
stars: variables: general - surveys
Abstract:
We present an Echelle+CCD, high S/N, high resolution (R=20000)
spectroscopic atlas of 108 well-known objects representative of the
most common types of peculiar and variable stars. The wavelength
interval extends from 4600 to 9400Å, and includes the RAVE, Gaia
and HERMES wavelength ranges. Multi-epoch spectra are provided for the
majority of observed stars. A total of 425 spectra of peculiar stars
are presented, which have been collected during 56 observing nights
between November 1998 and August 2002. The spectra are given in FITS
format and heliocentric wavelengths, with accurate subtraction of both
the sky background and the scattered light. Auxiliary material useful
for custom applications (telluric dividers, spectro-photometric stars,
flat-field tracings) is also provided. The atlas aims to provide a
homogeneous database of the spectral appearance of stellar
peculiarities, a tool useful both for classification purposes and
inter-comparison studies. It could also serve the planning for and
training of automated classification algorithms designed for RAVE,
Gaia, HERMES and other large scale spectral surveys. The spectrum of
XX Oph is discussed in some detail as an example of the content of the
present atlas.
Description:
This spectroscopic atlas is organized into 4 "families", named
pec_* for PECULIARS, flat_* for FLAT, std_* for STANDARD, and tel_*
for TELLURIC. The 425 scientific spectra (listed in table.dat) of 108
well-known objects representative of the most common types of peculiar
and variable stars presented in the atlas, are collected as FITS files
named pec_* sp directory. Each individual spectrum cover the spectral
range 4600-9400Å. (25 Echelle orders). The majority of the program
stars were observed at more than one observing epoch.
In addition to stellar spectra, we provide also other products. Flat
field tracings are in files named flat_* in sp directory.
Flat fields were exposed on a dome white screen, uniformly illuminated
by a 3750K halogen lamp. Flat-field tracings were extracted for each
stellar spectrum presented in this atlas, by adopting exactly the same
tracing and weighting parameters.
We provide the flat fields for each star mainly (1) to allow the
interested user to experiment with correction of the blaze function
and (2) to check for the very rare appearance of the feeble shadow of
a dust grain lying on the entrance window of the CCD dewar.
The spectro-photometric standards and telluric dividers are
in files named std_* and tel_* in sp directory, respectively.
All the fits files are in the spectra.tar.gz file.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 107 108 List of the program stars
table2.dat 99 208 Atlas products
table34.dat 51 25 Spectrophotometric standard stars (table3) and
telluric dividers (table4)
sp/* . 683 Individual spectra
spectra.tar 512 312940 Tar file of all 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 A1 --- TC Star type code (1)
3- 16 A14 --- Star Star name
18- 23 I6 --- HD ? HD number of star
25- 40 A16 --- Type Type of peculiarity
42- 50 A9 --- GCVS Type of variability from the living edition
of the GCVS
52- 66 A15 --- SpType Spectral type
68- 86 A19 --- r_SpType Reference for spectral type
88- 92 F5.2 mag (B-V)T ? Tycho B-V colour index
96-100 F5.2 mag VmagT ? Tycho V magnitude
101 A1 --- --- [-]
102-105 F4.1 mag VmagT2 ? Second value of VmagT when interval
106 A1 --- u_VmagT [)]
107 A1 --- n_VmagT [abc] Note on VmagT if not from Tycho (2)
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Note (1): Star type code as follows:
C = Chemically peculiar
P = Pulsating
I = Interacting and outbursting
A = Active surfaces, fast rotating
Y = Young emission-line objects
O = Other types
Note (2): Notes at follows:
a = VJ from VizieR: catalog I/280/ascc (Kharchenko, 2001)
b = Vmax and Vmin from GCVS: catalog B/gcvs (Samus et al., 2010)
c = Mean V magnitude from VizieR:
catalog II/215 (Hauck & Mermilliod, 1998)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- FileName Root fits file name, in subdirectory sp (1)
13- 23 F11.3 d HJD ? Mid-exposure Heliocentric Julian Date
25- 29 I5 s ExpTime Total exposure time
31- 44 A14 --- Star Star name
46- 49 I4 0.1nm lam.0 Spectral range covered: lower limit (Å)
50 A1 --- --- [-]
51- 54 I4 0.1nm lam.1 Spectral range covered: upper limit (Å)
56- 60 A5 --- Order Echelle orders
62- 64 I3 --- S/N ? Continuum Signal-to-Noise near Hα
66- 70 A5 --- Std Standard code(s), in table34.dat
72- 82 A11 --- Tell Telluric divider code(s), in table34.dat
84- 99 A16 --- Note Additional note (2)
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Note (1): Each final spectrum was built starting from several individual
exposures obtained consecutively at the telescope.
Three spectra are available in sp subdirectory :
* pec_FileName.fits = Final spectrum
* pecFileNamefv.fits = Spectrum obtained from the pec_FileName.fits
one subtracting VHELIO (computed with "rvcorrect" IRAF task) - the
heliocentric radial velocity - thus obtaning spectrum as would be
observed from the solar system barycenter.
* flat_FileName.fits = Flat field tracing spectrum
Note (2): Notes as follows:
a = sum of unsatured orders.
b = saturated orders #42-35 was substituted with the sum of
unsaturated orders of spectra 68Her_1 and 68Her_3
c = not included for all the spectra the satured order #34 (Hα)
d = order #34 taken from a unsaturated Hα spectrum
e = sum of 4 spectra taken in different dates (HJD 2452098.537 and
2452216.422); orders #45 and #34 from a 60s spectrum
f = sum of 9 spectra taken in different dates
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Byte-by-byte Description of file: table34.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Std Code for reference spectrum (1)
5- 22 A18 --- FileName FITS file name, in subdirectory sp (2)
24- 30 A7 --- Star Star name
32- 42 F11.3 d HJD Heliocentric Julian Date
44- 46 I3 s TExp Exposure time
48- 51 F4.2 --- Airmass Airmass
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Note (1): S1-S6 for Spectrophotometric standard stars,
T1-T19 for telluric dividers.
Note (2): Two spectra available in sp subdirectory:
* stdStarN.fits or telStarN.fits = Final spectrum
* flatStarN.fits = Flat field tracing spectrum
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Acknowledgements:
Lina Tomasella, tomasella(at)oapd.inaf.it
(End) Lina Tomasella [INAF OAPd, Italy], Patricia Vannier [CDS] 14-Nov-2010