J/AJ/127/334 MACHO LMC first-overtone RR Lyrae variables (Alcock+, 2004)
The MACHO project Large Magellanic Cloud variable-star inventory.
XIII. Fourier parameters for the first-overtone RR Lyrae variables and the
LMC distance.
Alcock C., Alves D.R., Axelrod T.S., Becker A.C., Bennett D.P.,
Clement C.M., Cook K.H., Drake A.J., Freeman K.C., Geha M., Griest K.,
Lehner M.J., Marshall S.L., Minniti D., Muzzin A., Nelson C.A.,
Peterson B.A., Popowski P., Quinn P.J., Rodgers A.W., Rowe J.F.,
Sutherland W., Vandehei T., Welch D.L.
<Astron. J., 127, 334-354 (2004)>
=2004AJ....127..334A 2004AJ....127..334A (SIMBAD/NED BibCode)
ADC_Keywords: Magellanic Clouds ; Stars, variable
Keywords: galaxies: distances and redshifts - Magellanic Clouds -
RR Lyrae variable
Abstract:
Shapes of RR Lyrae light curves can be described in terms of Fourier
coefficients that past research has linked with physical
characteristics such as luminosity, mass, and temperature. Fourier
coefficients have been derived for the V and R light curves of 785
overtone RR Lyrae variables in 16 MACHO fields near the bar of the
LMC.
Description:
Our investigation is based on the RR Lyrae data from 16 LMC fields
observed for the MACHO project. The LMC fields included are Nos. 2, 3,
5, 6, 10, 11, 12, 13, 14, 15, 18, 19, 47, 80, 81, and 82, all of which
are close to the bar. The field of view for each field is 0.52deg2.
An identification chart and a list of the right ascension and
declination of the field centers are available at
http://wwwmacho.mcmaster.ca .
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 130 1360 Fourier Parameters of LMC RR1 Variables
table2.dat 130 118 Fourier Parameters of LMC RR01 Variables
table3.dat 130 4 Fourier Parameters of LMC RR12 Variables
table4.dat 130 32 Fourier Parameters of LMC RR1-ν1 Variables
table5.dat 130 56 Fourier Parameters of Other Multifrequency
LMC RR1 Variables
table6.dat 71 58 RR Lyrae Stars Included in Two Fields
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See also:
II/247 : Variable Stars in the Large Magellanic Clouds (MACHO, 2001)
J/ApJ/542/257 : MACHO LMC first-overtone RR Lyrae (Alcock+, 2000)
J/ApJ/598/597 : MACHO LMC fundamental-mode RR Lyrae (Alcock+, 2003)
Byte-by-byte Description of file: table[12345].dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- MACHO Object identification
15- 18 I4 --- o_MACHO Number of observation of MACHO
20 A1 --- Filt Filter used in observation
22- 25 A4 --- f_MACHO Flag on MACHO (1)
27- 31 F5.3 mag Amp Light amplitude
33- 37 F5.3 mag errFit The 1 σ fitting error of eq. (1) (2)
39- 46 F8.6 d Per Period
48- 52 F5.2 mag A0 The AO value from eq. (1) (2)
54- 58 F5.3 mag A1 The A1 value from eq. (1) (2)
60- 65 F6.4 --- R21 The A2/A1 amplitude ratio
67- 72 F6.4 --- e_R21 The 1 σ error in R21
74- 79 F6.4 --- R31 The A3/A1 amplitude ratio
81- 86 F6.4 --- e_R31 The 1 σ error in R31
88- 93 F6.4 --- R41 The A4/A1 amplitude ratio
95-100 F6.4 --- e_R41 The 1 σ error in R41
102-105 F4.2 rad F21 The phase difference φ2-2*φ1
107-110 F4.2 rad e_F21 The 1 σ error in F21
112-115 F4.2 rad F31 The phase difference φ3-3*φ1
117-120 F4.2 rad e_F31 The 1 σ error in F31
122-125 F4.2 rad F41 The phase difference φ4-4*φ1
127-130 F4.2 rad e_F41 The 1 σ error in F41
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Note (1): Flags have the following meaning:
X = The same star is included in two fields;
bf = A "bona fide" RR1 variable according to the criteria set out
in section 3.3;
M = A "bf" star that is also considered to be M5-like.
Note (2): Eq. (1): mag = A0 + {Sum(j)}Aj*cos(jwt+φj),
where w is 2π/period, t is the time of the observation, n is
the order of the fit, and φj the j phase.
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- MACHO Object identification
14- 15 I2 h RAh Hour of right ascension (J2000)
17- 18 I2 min RAm Minute of right ascension (J2000)
20- 25 F6.3 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- 38 F5.2 arcsec DEs Arcsecond of declination (J2000)
40- 47 F8.6 d Per Period
49- 53 F5.2 mag Vmag Mean V-band magnitude (1)
55- 59 F5.2 mag Rmag Mean R-band magnitude (1)
61- 64 F4.2 rad F31 The φ31 value for the V-band data
66- 69 F4.2 rad e_F31 The 1σ error in F31
71 I1 --- TNum Table where the data can be found
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Note (1): The A0 value derived from eq. (1).
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History:
From electronic version of the journal
References:
Alcock et al., Paper I 1996ApJ...461...84A 1996ApJ...461...84A
Alcock et al., Paper II 1996AJ....111.1146A 1996AJ....111.1146A
Alcock et al., Paper III 1997ApJ...482...89A 1997ApJ...482...89A
Alcock et al., Paper IV 1996ApJ...470..583A 1996ApJ...470..583A
Alcock et al., Paper V 1997AJ....114..326A 1997AJ....114..326A
Alcock et al., Paper VI 1996ApJ...470..583A 1996ApJ...470..583A
Alcock et al., Paper VII 1998AJ....115.1921A 1998AJ....115.1921A
Alcock et al., Paper VIII 1999AJ....117..920A 1999AJ....117..920A
Alcock et al., Paper IX 2000ApJ...542..257A 2000ApJ...542..257A, Cat. J/ApJ/542/257
Alcock et al., Paper X 2001ApJ...554..298A 2001ApJ...554..298A
Alcock et al., Paper XI 2003ApJ...598..597A 2003ApJ...598..597A, Cat. J/ApJ/598/597
Alcock et al., Paper XII 2002ApJ...573..338A 2002ApJ...573..338A
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 20-Feb-2004