J/ApJ/861/153 Ultraviolet Extinction in the GALEX Bands. UVEXT (Sun+, 2018)
The ultraviolet extinction in the GALEX bands.
Sun M., Jiang B.W., Zhao H., Gao J., Gao S., Jian M., Yuan H.
<Astrophys. J., 861, 153-153 (2018)>
=2018ApJ...861..153S 2018ApJ...861..153S (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Ultraviolet ; Extinction
Keywords: dust, extinction - ultraviolet: ISM - ultraviolet: stars
Abstract:
Interstellar extinction in ultraviolet is the most severe in
comparison with optical and infrared wavebands and a precise
determination plays an important role in correctly recovering the
ultraviolet brightness and colors of objects. By finding the observed
bluest colors at the given effective temperature and metallicity range
of dwarf stars, stellar intrinsic colors, CB,V0, CNUV,B0,
CFUV,B0, and CFUV,NUV0, are derived according to the stellar
parameters from the LAMOST spectroscopic survey and photometric
results from the GALEX and APASS surveys. With the derived intrinsic
colors, the ultraviolet color excesses are calculated for about 25,000
A- and F-type dwarf stars. Analysis of the color excess ratios yields
the extinction law related to the GALEX UV bands:
ENUV,B/EB,V=3.77, EFUV,B/EB,V=3.39, and
EFUV,NUV/EB,V=-0.38. The results agree very well with previous
works in the NUV band and in general with the extinction curve derived
by Fitzpatrick (1999PASP..111...63F 1999PASP..111...63F) for RV=3.35.
Description:
The Ultraviolet Extinction in the GALEX Bands (UVEXT) catalog is
obtained by using the GALEX, APASS, LAMOST surveys.
The cross-match is carried out with a radius of 3". The GALEX DR6/7
and APASS DR9 catalogs are cross-matched first. This GALEX-APASS
catalog is further cross-identified with the LAMOST spectroscopic
survey.
This catalog includes 25496 stars in the northern sky. The limiting
magnitude are B,V<17, NUV<21mag and FUV<20mag, and the photometry
accuracy is better than 0.05 in the V,B band, 0.20mag in the NUV band
and 0.30mag in the FUV band. The color excesses in the GALEX bands,
E(NUV-B) and E(FUV-B), are listed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
uvext.dat 157 25496 Ultraviolet extinction in the GALEX bands catalog
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See also:
V/153 : LAMOST DR4 catalogs (Luo+, 2018)
II/336 : AAVSO Photometric All Sky Survey (APASS) DR9 (Henden+, 2016)
http://dolomiti.pha.jhu.edu/uvsky/ : GALEX Home Page
Byte-by-byte Description of file: uvext.dat
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Bytes Format Units Label Explanations
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1- 6 F6.2 deg RAdeg Source's right ascension (J2000)
8- 12 F5.2 deg DEdeg Source's declination (J2000)
14- 19 F6.2 deg GLON Source's Galactic longitude (J2000)
21- 26 F6.2 deg GLAT Source's Galactic latitude (J2000)
28- 31 I4 K Teff Effective Temperature from the
LAMOST/DR4 catalog (Cat. V/153)
33- 35 I3 K e_Teff Effective Temperature Uncertainty from the
LAMOST/DR4 catalog
37- 40 F4.2 [cm/s2] logg Surface Gravity from the LAMOST/DR4 catalog
42- 45 F4.2 [cm/s2] e_logg Surface Gravity Uncertainty from the
LAMOST/DR4 catalog
47- 51 F5.2 [-] [Fe/H] Metallicity from the LAMOST/DR4 catalog
53- 56 F4.2 [-] e_[Fe/H] Metallicity Uncertainty from the
LAMOST/DR4 catalog
58- 65 F8.3 mag FUV ?=-999 FUV calibrated magnitude from the
GALEX/DR6/7 catalog
67- 74 F8.3 mag e_FUV ?=-999 FUV calibrated magnitude error from
the GALEX/DR6/7 catalog
76- 81 F6.3 mag NUV NUV calibrated magnitude from the
GALEX/DR6/7 catalog
83- 87 F5.3 mag e_NUV NUV calibrated magnitude error from the
JGALEX/DR6/7 catalog
89- 94 F6.3 mag Bmag B calibrated magnitude from the
APASS/DR9 catalog (Cat. II/336)
96-100 F5.3 mag e_Bmag B calibrated magnitude error from the
APASS/DR9 catalog
102-107 F6.3 mag Vmag V calibrated magnitude from the
APASS/DR9 catalog
109-113 F5.3 mag e_Vmag V calibrated magnitude error from the
APASS/DR9 catalog
115-122 F8.3 mag (FUV-B)0 ?=-999 Intrinsic FUV-B color index
124-128 F5.3 mag (NUV-B)0 Intrinsic NUV-B color index
130-134 F5.3 mag (B-V)0 Intrinsic B-V color index
136-143 F8.3 mag E(FUV-B) ?=-999 FUV-B color excess
145-150 F6.3 mag E(NUV-B) NUV-B color excess
152-157 F6.3 mag E(B-V) B-V color excess
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Acknowledgements:
Mingxu Sun, 201521160009(at)mail.bnu.edu.cn
(End) Mingxu Sun [BNU], Patricia Vannier [CDS] 08-Sep-2018