J/AJ/126/237 BV photometry of LW 55 in LMC (Kaluzny+, 2003)
Open cluster LW 55 in the Large Magellanic Cloud.
Kaluzny J., Rucinski S.M.
<Astron. J. 126, 237 (2003)>
=2003AJ....126..237K 2003AJ....126..237K
ADC_Keywords: Magellanic Clouds ; Clusters, open ; Photometry, UBV
Keywords: galaxies: individual (Large Magellanic Cloud) -
galaxies: star clusters - Magellanic Clouds - techniques: photometric
Abstract:
The field of the moderately old open cluster LW 55 in the outer parts
of the Large Magellanic Cloud disk was monitored for detection of
short-period variable stars over two nights. Eight variables were
found; all but one (a detached eclipsing binary) are small-amplitude
(ΔV≤0.1mag) pulsating stars of the δ Scuti, SX Phoenicis,
or Doradus type. The BV color-magnitude diagram extends down to the
solar-type stars at V=24 (MV∼5.2). The cluster age is estimated at
1.5Gyr for Z=0.004 ([Fe/H]=-0.67); the surrounding stellar field is
older, with an age greater than 4Gyr.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 1833 Photometric Data for LW 55
table2.dat 61 8 Variable star in LW 55
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See also:
VII/183 : Cluster System of the LMC (Kontizas+ 1990)
J/AJ/117/238 : LMC extended catalog (Bica+, 1999)
J/A+AS/110/533 : Clusters and field stars in LMC. I. (Linde+, 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [KR2003] Sequential star number
6- 11 F6.2 pix Xpix The X pixel position (G1)
13- 19 F7.2 pix Ypix The Y pixel position (G1)
21- 28 F8.5 deg RAdeg Right ascension in decimal degrees (J2000)
30- 38 F9.5 deg DEdeg Declination in decimal degrees (J2000)
40- 45 F6.3 mag Vmag V magnitude
47- 51 F5.3 mag e_Vmag Error in Vmag
53- 57 F5.3 mag B-V (B-V) colour index
59- 63 F5.3 mag e_B-V Error in B-V
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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- 2 A2 --- VName Variable number, VN (1)
4- 7 I4 --- [KR2003] Sequential star number
9- 14 F6.2 pix Xpix The X pixel position (G1)
16- 21 F6.2 pix Ypix The Y pixel position (G1)
23- 27 F5.2 mag Vmag Median V magnitude value (2)
28 A1 --- n_Vmag [a] a: V magnitude for the maximum light
30 A1 --- l_DVmag Limit flag on DVmag
31- 34 F4.2 mag DVmag Variability amplitude in Vmag
36- 40 F5.3 mag B-V (B-V) colour index
42- 43 I2 h RAh Right ascension (J2000) (3)
45- 46 I2 min RAm Right ascension (J2000) (3)
48- 51 F4.1 s RAs Right ascension (J2000) (3)
53 A1 --- DE- Declination sign (J2000) (3)
54- 55 I2 deg DEd Declination (J2000) (3)
57- 58 I2 arcmin DEm Declination (J2000) (3)
60- 61 I2 arcsec DEs Declination (J2000) (3)
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Note (1): The full names that conform to the International Astronomical
Union recommendations are "LW 55-LCO-VN, [KR2003] VN in Simbad
Note (2): The median V-band magnitude values are based on all available
observations, not only those that were used in formation of the
reference image. They are slightly different from the values in
table 1 because of the different averaging.
Note (3): The J2000.0 equatorial coordinates were obtained through an
astrometric frame solution using positions of 50 stars from the
USNO-A2.0 catalogue; this solution reproduces the J2000.0 coordinates
of these stars with residuals not exceeding 1.0" in right ascension
and declination. For coordinates expressed in decimal degrees, consult
Table 1 using the star number under No.
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Global notes:
Note (G1): In the reference image as in Fig. 2.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 26-Sep-2003