J/AJ/117/206 LMC far-ultraviolet imaging (Brosch+, 1999)
Far-ultraviolet imaging of the field star population in the
Large Magellanic Cloud with the Hubble Space Telescope.
Brosch N., Shara M., Mackenty J., Zurek D., McLean B.
<Astron. J. 117, 206 (1999)>
=1999AJ....117..206B 1999AJ....117..206B
ADC_Keywords: Magellanic Clouds ; Photometry, ultraviolet
Mission_Name: HST
Keywords: galaxies: individual (Large Magellanic Cloud) - galaxies: irregular -
galaxies: stellar content - stars: formation
Abstract:
We present an analysis of the deepest pure UV observations with the
highest angular resolution ever performed, a set of 12 exposures with
the Hubble Space Telescope (HST) Wide Field Planetary Camera 2 and
F160BW filter obtained in parallel observing mode, which covers
∼12arcmin2 in the Large Magellanic Cloud (LMC), north of the bar,
and in the "general field" regime of the LMC. The 341 independent
measurements of 198 objects represent an accumulated exposure of
≥2x104s and reveal stars as faint as mUV~=22mag. The observations
show that about two-thirds of the UV emission from the LMC is emitted
by our HST-detected UV stars in the field, that is, not in clusters or
associations. We identified optical counterparts in the Royal
Observatory Edinburgh/Naval Research Laboratory photometric catalog
for about one-third of the objects.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 46 12 WFPC2 data sets analyzed in this paper
table2.dat 69 341 Far-UV raw photometry of field stars in the LMC
table3.dat 42 198 Far-UV photometry of field stars in the LMC
table4.dat 31 65 LMC UV objects with UIT counterparts
table5.dat 26 58 LMC UV objects with ROE/NRL counterparts
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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 --- Set DataSet
3- 11 A9 --- Name Name of the image
13- 14 I2 h RAh Right ascension (J2000.0)
16- 17 I2 min RAm Right ascension (J2000.0)
19- 22 F4.1 s RAs Right ascension (J2000.0)
24 A1 --- DE- Declination sign (J2000.0)
25- 26 I2 deg DEd Declination (J2000.0)
28- 29 I2 arcmin DEm Declination (J2000.0)
31- 32 I2 arcsec DEs Declination (J2000.0)
34- 37 I4 s Exp Exposure time
39- 46 A8 "DD/MM/YY" Date Observation date
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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- 3 I3 --- [BSM99] Source number
4 A1 --- m_[BSM99] [ab] Multiplicity index on [BSM99]
6- 12 F7.3 pix Xpos X position
14- 20 F7.3 pix Ypos Y position
22- 23 I2 h RAh Right ascension (J2000.0)
25- 26 I2 min RAm Right ascension (J2000.0)
28- 33 F6.3 s RAs Right ascension (J2000.0)
35 A1 --- DE- Declination sign (J2000.0)
36- 37 I2 deg DEd Declination (J2000.0)
39- 40 I2 arcmin DEm Declination (J2000.0)
42- 46 F5.2 arcsec DEs Declination (J2000.0)
48 A1 --- Set Set designation
49 A1 --- --- [,]
51- 53 A3 --- Chip Chip (pc, wf2, wf3, wf4)
55 A1 --- F160BW [V] V: F160BW magnitude in FUV value
57- 62 F6.3 mag FUV ? FUV (1491Å) magnitude
64- 68 F5.3 mag e_FUV ? rms uncertainty on FUV
69 A1 --- n_FUV [I] I: Indefinite
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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- 3 I3 --- [BSM99] Sequential number
4 A1 --- m_[BSM99] [ab] Multiplicity index on [BSM99]
6 I1 --- nObs Number of observations
8- 9 I2 h RAh Right ascension (J2000.0)
11- 12 I2 min RAm Right ascension (J2000.0)
14- 18 F5.2 s RAs Right ascension (J2000.0)
20 A1 --- DE- Declination sign (J2000.0)
21- 22 I2 deg DEd Declination (J2000.0)
24- 25 I2 arcmin DEm Declination (J2000.0)
27- 31 F5.2 arcsec DEs Declination (J2000.0)
33- 37 F5.2 mag FUV Mean FUV (1491Å) magnitude
39- 42 F4.2 mag e_FUV rms uncertainty on FUV
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [PHC98] UIT identification number, Parker et al.,
1998, Cat. J/AJ/116/180
7- 11 F5.2 mag B1mag UIT B1 (1521Å) magnitude
13- 16 F4.2 mag e_B1mag rms uncertainty on B1mag
18- 20 I3 --- [BSM99] HST counterpart
22- 26 F5.2 mag UVmag HST UV magnitude
28- 31 F4.2 mag e_UVmag rms uncertainty on UVmag
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ROE/NRL ROE/NRL sequential number, (Yentis et al.,
1992, Digitized Optical Sky Surveys, p.67,
Wallin et al., 1994BAAS...84.2704W 1994BAAS...84.2704W)
6- 10 F5.2 mag UVmag UV magnitude
12- 15 F4.2 mag e_UVmag rms uncertainty on UVmag
17- 21 F5.2 mag UV-V UV-V colour index
23- 26 F4.2 mag e_UV-V rms uncertainty on UV-V
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History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 26-Feb-1999