J/A+A/596/A49 Synthetic GALEX photometry for IUE sources (Beitia-Antero+, 2016)
A database of synthetic photometry in the GALEX ultraviolet bands for the
stellar sources observed with the International Ultraviolet Explorer.
Beitia-Antero L., Gomez de Castro A.I.
<Astron. Astrophys. 596, A49 (2016)>
=2016A&A...596A..49B 2016A&A...596A..49B (SIMBAD/NED BibCode)
ADC_Keywords: Milky Way ; Photometry, ultraviolet
Keywords: astronomical databases - catalogues - surveys - ultraviolet: stars
Abstract:
The Galaxy Evolution Explorer (GALEX) has produced the largest
photometric catalogue of ultraviolet (UV) sources. As such, it has
defined the new standard bands for UV photometry: the near UV band
(NUV) and the far UV band (FUV). However, due to brightness limits,
the GALEX mission has avoided the Galactic plane which is crucial for
astrophysical research and future space missions.
The International Ultraviolet Explorer (IUE) satellite obtained 63,755
spectra in the low dispersion mode (λ/δλ∼300)
during its 18-year lifetime. We have derived the photometry in the
GALEX bands for the stellar sources in the IUE Archive to extend the
GALEX database with observations including the Galactic plane.
Good quality spectra have been selected for the IUE classes of stellar
sources. The GALEX FUV and NUV magnitudes have been computed using the
GALEX transmission curves, as well as the conversion equations between
flux and magnitudes provided by the mission (galexgi.gsfc.nasa.gov).
Consistency between GALEX and IUE synthetic photometries has been
tested using White Dwarfs (WD) contained in both samples. The
non-linear response performance of GALEX inferred from this data
agrees with the results from GALEX calibration. The photometric
database is made available to the community through the services of
the Centre de Donnees Stellaires at Strasbourg (CDS). The catalogue
contains FUV magnitudes for 1628 sources, ranging from FUV=1.81 to
FUV=18.65mag. In the NUV band, the catalogue includes observations
for 999 stars ranging from NUV=3.34 to NUV=17.74mag.
UV photometry for 1490 sources not included in the GALEX AIS GR5
catalogue is provided; most of them are hot (O-A spectral type) stars.
The sources in the catalogue are distributed over the full sky,
including the Galactic plane.
Description:
Synthetic photometry in the GALEX bands for stellar sources observed
with the IUE in low dispersion mode is provided. Only high
signal-to-noise ratio photometric observations have been used (see
bibliographic reference).
There are two catalogues:
maincat contains synthetic magnitudes for non-variable stars;
fuvvar contains synthetic FUV magnitudes for variable stars.
Non-variable means that no variation in the UV flux has been detected
by IUE. For each entry, coordinates, FUV and NUV magnitudes and
magnitude errors are provided.
SUMMARY OF CONTENTS:
maincat includes FUV and/or NUV synthetic magnitudes for 1722 stars.
FUV magnitude is provided for 1628 sources, ranging from FUV=1.81
to FUV=18.65mag.
NUV magnitude is provided for 999 stars, ranging from NUV=3.34 to
NUV=17.74mag.
Also the number of observations used for the calculation is indicated.
fuvvar includes FUV synthetic magnitude and error as well as
observation date and time for each one of the 88 variable sources in
FUV.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
maincat.dat 90 1722 Catalogue of 1722 non-variable stars
fuvvar.dat 79 895 FUV magnitudes of 895 observations
corresponding to 88 variable stars
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See also:
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
J/MNRAS/427/2180 : GALEX survey subdwarf atmospheric parameters (Nemeth+, 2012)
Byte-by-byte Description of file: maincat.dat
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Bytes Format Units Label Explanations
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1- 19 A19 ---- Name IUE object identification
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 31 F5.2 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 44 F5.2 arcsec DEs Declination (J2000)
46- 48 I3 --- nSWP Number of SWP observations used
50- 55 F6.3 mag FUV ?=- FUV synthetic magnitude
57- 61 F5.3 mag E_FUV ?=- Error on FUV (upper value)
63- 67 F5.3 mag e_FUV ?=- Error on FUV (lower value)
69- 71 I3 --- nLW Number of LW observations used
73- 78 F6.3 mag NUV ?=- NUV synthetic magnitude
80- 84 F5.3 mag E_NUV ?=- Error on NUV (upper value)
86- 90 F5.3 mag e_NUV ?=- Error on NUV (lower value)
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Byte-by-byte Description of file: fuvvar.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name IUE object identification
17- 18 I2 h RAh Right ascension (J2000)
20- 21 I2 min RAm Right ascension (J2000)
23- 27 F5.2 s RAs Right ascension (J2000)
29 A1 --- DE- Declination sign (J2000)
30- 31 I2 deg DEd Declination (J2000)
33- 34 I2 arcmin DEm Declination (J2000)
36- 40 F5.2 arcsec DEs Declination (J2000)
42- 51 A10 "YYYY-MM-DD" Obs.date Observation date
53- 60 A8 "h:m:s" Obs.time Observation time
62- 67 F6.3 mag FUV FUV synthetic magnitude
69- 73 F5.3 mag E_FUV FUV error on FUV (upper value)
75- 79 F5.3 mag e_FUV FUV error on FUV (lower value)
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Acknowledgements:
Leire Beitia-Antero, lbeitia(at)ucm.es
Ana Ines Gomez de Castro, aig(at)ucm.es
(End) Leire Beitia-Antero [UCM, Spain], Patricia Vannier [CDS] 13-Oct-2016