J/ApJS/161/154 Near-IR spectral atlas of OB stars (Hanson+, 2005)
A medium resolution near-infrared spectral atlas of O and early-B stars.
Hanson M.M., Kudritzki R.-P., Kenworthy M.A., Puls J., Tokunaga A.T.
<Astrophys. J. Suppl. Ser., 161, 154-170 (2005)>
=2005ApJS..161..154H 2005ApJS..161..154H
ADC_Keywords: Atlases ; Infrared sources ; Stars, early-type ; Spectra, infrared
Keywords: atlases - infrared: stars - stars: early-type -
stars: fundamental parameters - techniques: spectroscopic
Abstract:
We present intermediate-resolution (R∼8000-12000) high signal-to-noise
(S/N) H- and K-band spectroscopy of a sample of 37 optically visible
stars, ranging in spectral type from O3 to B3 and representing most
luminosity classes. Spectra of this quality can be used to constrain
the temperature, luminosity, and general wind properties of OB stars,
when used in conjunction with sophisticated atmospheric model codes.
Most important is the need for moderately high resolutions (R≥5000)
and very high signal-to-noise (S/N≥150) spectra for a meaningful
profile analysis. When using near-infrared spectra for a
classification system, moderately high signal-to-noise (S/N∼100) is
still required, though the resolution can be relaxed to just a
thousand or two. In the Appendix we provide a set of very high-quality
near-infrared spectra of Brackett lines in six early-A dwarfs. These
can be used to aid in the modeling and removal of such lines when
early-A dwarfs are used for telluric spectroscopic standards.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 106 37 Sample and Observing Data
table3.dat 37 6 Telluric stars
atlas/* . 43 FITS files of the Spectra (range 2.0-2.5µm)
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See also:
III/195 : Optical Spectral Classification OB Stars Atlas (Walborn+ 1990)
J/A+AS/105/305 : OB stars observed with high dispersion by IUE (Bohlin+ 1994)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
12- 20 A9 --- SpType Spectral type
22- 24 F3.1 mag Hmag 2MASS H magnitude
26- 28 F3.1 mag Kmag 2MASS K magnitude
30- 31 I2 h RAh Right ascension (J2000)
33- 34 I2 min RAm Right ascension (J2000)
36- 39 F4.1 s RAs Right ascension (J2000)
41 A1 --- DE- Declination sign (J2000)
42- 43 I2 deg DEd Declination (J2000)
45- 46 I2 arcmin DEm Declination (J2000)
48- 49 I2 arcsec DEs Declination (J2000)
51- 59 A9 --- VLT-ISAAC ?VLT-ISAAC observation date (1)
61- 78 A18 --- Subaru-IRCS Subaru-IRSC observation dates (2)
80-106 A27 --- FileName Name of the spectra FITS file in
the "atlas" subdirectory
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Note (1): The VLT-ISAAC H-band resolution is R∼10000; the K-band resolution
is R∼8000. The typical S/N ratios obtained with these spectra were
S/N∼100-150, with areas as high as S/N∼200 and as low as S/N∼50,
depending on the local telluric contamination.
Note (2): The Subaru-IRCS H- and K-band resolution is R∼12000. The typical
S/N ratios obtained with these spectra were S/N∼200-300, with areas as
high as S/N∼500, and as low as S/N∼100, depending on the local
telluric contamination.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Star name
11- 16 A6 --- SpType Spectral type
17- 19 I3 km/s vsini Rotational velocity (1)
21- 37 A17 --- FileName Name of the spectra FITS file in
the "atlas" subdirectory
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Note (1): From Royer et al., 2002, Cat. J/A+A/381/105 and Cat. J/A+A/393/897
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Acknowledgements:
Margaret Hanson, hansonmm(at)uc.edu
(End) Patricia Vannier [CDS] 19-Sep-2007