J/AJ/131/407 BV photometry of stars in the LMC (Kaluzny+, 2006)
Variable stars in the Large Magellanic Cloud: discovery of extragalactic W UMa
binaries.
Kaluzny J., Mochnacki S., Rucinski S.M.
<Astron. J., 131, 407-413 (2006)>
=2006AJ....131..407K 2006AJ....131..407K
ADC_Keywords: Magellanic Clouds ; Stars, variable ; Photometry, UBV
Keywords: binaries: general - galaxies: individual (Large Magellanic Cloud) -
galaxies: star clusters - Magellanic Clouds - techniques: photometric
Abstract:
We observed a field in the disk of the LMC on two consecutive nights
in search of rapid variable stars. We found two pulsating stars of
type RRab and Scuti and four binary stars; among the latter we found
one sdB or cataclysmic variable below the LMC blue main sequence and
three very close binary systems on the main sequence.
Description:
We used the Magellan/Baade 6.5m telescope with the TEK5 CCD 2Kx2K
camera, which had a focal scale of 0.069"/pixel. The observations were
made on two nights, 2002 January 4/5 and 5/6. We conducted 6.2hr of
variability monitoring on the first night and 7.3hr on the second
night. The nights can be characterized as gray time, with fractions of
the illuminated area of the Moon disk of 61% and 50%, respectively.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 65 4413 Photometric data for LMC Disk-1
table2.dat 100 6 Variable stars in LMC Disk 1
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See also:
J/AJ/126/237 : BV photometry of LW 55 in LMC (Kaluzny+, 2003)
J/AJ/123/3460 : Low-amplitude variables in NGC 6791 (Mochejska+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- [KMR2006] Identification number
6- 12 F7.2 pix Xpos The X pixel coordinate (1)
14- 20 F7.2 pix Ypos The Y pixel coordinate (1)
22- 29 F8.5 deg RAdeg Right Ascension in decimal degrees (J2000)
31- 39 F9.5 deg DEdeg Declination in decimal degrees (J2000)
41- 46 F6.3 mag Vmag The V band magnitude
48- 52 F5.3 mag e_Vmag Error in Vmag (2)
54- 59 F6.3 mag B-V The (B-V) color index
61- 65 F5.3 mag e_B-V Error in B-V (2)
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Note (1): Of the reference image, as in Figure 1.
Note (2): The formal errors given here can be used to compare relative
uncertainties; the external estimates of the errors are discussed
in the text.
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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 star name
4- 7 I4 --- [KMR2006] Identification number
9- 14 F6.2 pix Xpos The X pixel coordinate
16- 21 F6.2 pix Ypos The Y pixel coordinate
23 A1 --- l_Vmag1 [<] Flag on Vmag1
24- 28 F5.2 mag Vmag1 Maximum of V magnitude (1)
30- 34 F5.2 mag Vmag2 Minimum of V magnitude (1)
36- 40 F5.2 mag B-V B-V color index (1)
42- 43 I2 h RAh Hour of Right Ascension (J2000.0)
45- 46 I2 min RAm Minute of Right Ascension (J2000.0)
48- 52 F5.2 s RAs Second of Right Ascension (J2000.0)
54 A1 --- DE- Sign of the Declination (J2000.0)
55- 56 I2 deg DEd Degree of Declination (J2000.0)
58- 59 I2 arcmin DEm Arcminute of Declination (J2000.0)
61- 64 F4.1 arcsec DEs Arcsecond of Declination (J2000.0)
66- 78 A13 --- Type Variable type
80- 85 F6.4 d Per Period
86 A1 --- u_Per Uncertainty flag on Per
88- 93 F6.4 d e_Per ? Error in Per
95-100 F6.3 d T0 ? Initial epoch T0 (HJD-2452200)
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Note (1): The V and B-V data differ slightly between this table and table1
due to the different photometric methods used; the differences
can be taken as indications of external uncertainties combined
with genuine variability.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Marianne Brouty [CDS] 02-Nov-2006