J/AJ/140/328 LMC High-amplitude delta Scuti stars (Garg+, 2010)
High-amplitude δ-Scutis in the Large Magellanic Cloud.
Garg A., Cook K.H., Nikolaev S., Huber M.E., Rest A., Becker A.C.,
Challis P., Clocchiatti A., Miknaitis G., Minniti D., Morelli L., Olsen K.,
Prieto J.L., Suntzeff N.B., Welch D.L., Wood-Vasey W.M.
<Astron. J., 140, 328-338 (2010)>
=2010AJ....140..328G 2010AJ....140..328G
ADC_Keywords: Surveys ; Magellanic Clouds ; Stars, variable
Keywords: Magellanic Clouds - surveys
Abstract:
We present 2323 high-amplitude δ-Scuti (HADS) candidates
discovered in the Large Magellanic Cloud by the SuperMACHO survey
(Rest et al., 2005ApJ...634.1103R 2005ApJ...634.1103R). Frequency analyses of these
candidates reveal that several are multimode pulsators, including 119
whose largest amplitude of pulsation is in the fundamental (F) mode
and 19 whose largest amplitude of pulsation is in the first overtone
(FO) mode.
Description:
The SuperMACHO project is a five-year optical survey of the LMC aimed
at detecting microlensing of LMC stars (Rest et al.,
2005ApJ...634.1103R 2005ApJ...634.1103R).
The survey was conducted on the CTIO Blanco 4m telescope using a
custom VR broadband filter with the MOSAIC II wide-field imager.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 89 2323 The δ-Scuti Fourier candidates
table2.dat 76 213959 VR-band light curves
table3.dat 98 2323 The δ-Scuti Fourier parameters
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See also:
J/AcA/60/1 : VI light curves of LMC delta Scuti stars (Poleski+, 2010)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- [GCN2010] Candidate label
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 25 F5.2 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 37 F4.1 arcsec DEs Arcsecond of Declination (J2000)
39- 45 F7.5 d Per Primary pulsation period
47- 50 F4.2 mag Delta Overall, peak-to-trough VR band amplitude
52- 56 F5.2 mag VRmag The VR band magnitude
58- 62 F5.2 mag Imag The I band magnitude
64- 67 F4.2 mag B-I The (B-I) color index
69- 71 I3 --- o_VRmag Number of VRmag observations
73- 79 F7.3 --- f1/f2 ?=-99.999 Ratio of primary to secondary
frequency of variation ratio
81- 89 A9 --- Type Candidate shows multiple modes of pulsation (1)
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Note (1): F and FO refer to objects identified through their secondary
frequencies as double-mode fundamental and first overtone pulsators
respectively.
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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- 13 A13 --- [GCN2010] Candidate label
15- 25 F11.5 d MJD Modified Julian Date of observation
27- 35 F9.2 --- DFlux VR-band difference flux
37- 44 F8.2 --- e_DFlux Uncertainty in DFlux
46- 53 F8.2 --- tFlux VR-band template source flux
55- 59 F5.2 mag VRmag VR-band magnitude; DFlux + tFlux
61- 64 F4.2 mag e_VRmag Uncertainty in VRmag
66- 70 F5.2 mag zpt Zero point
72- 73 A2 --- --- [0x]
74- 76 A3 --- Pcode [0-9A-F] Photometry code (hexadecimal,
unspecified meaning)
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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- 13 A13 --- [GCN2010] Candidate label
15- 21 F7.5 d Per Primary pulsation period
23- 26 F4.2 mag Delta Overall, peak-to-trough VR band amplitude
28- 32 F5.2 mag VRmag The VR band magnitude
34- 38 F5.2 mag Imag The I band magnitude
40- 43 F4.2 mag B-I The (B-I) color index
45- 48 F4.2 mag A1 Fourier decomposition A1 parameter
50- 53 F4.2 mag A2 Fourier decomposition A2 parameter
55- 58 F4.2 mag A3 Fourier decomposition A3 parameter
60- 63 F4.2 mag A4 Fourier decomposition A4 parameter
65- 68 F4.2 --- r21 r21 = A2/A1
70- 73 F4.2 --- r31 r31 = A3/A1
75- 78 F4.2 --- r41 r41 = A4/A1
80- 83 F4.2 rad phi21 Fourier decomposition φ21 parameter
85- 88 F4.2 rad phi31 Fourier decomposition φ31 parameter
90- 93 F4.2 rad phi41 Fourier decomposition φ41 parameter
95- 98 F4.2 --- phi.d φdiff parameter, difference between the
phase of minimum and maximum (is 0.5 for a
purely symmetric, sinusoidal light curve)
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 11-Jun-2012