J/A+A/454/257 First overtone RR Lyrae in LMC (Nagy+, 2006)
On the incidence rate of first overtone Blazhko stars in the
Large Magellanic Cloud.
Nagy A., Kovacs G.
<Astron. Astrophys., 454, 257-264 (2006)>
=2006A&A...454..257N 2006A&A...454..257N
ADC_Keywords: Stars, variable ; Magellanic Clouds
Keywords: stars: variables: RR Lyrae - stars: fundamental parameters -
galaxies: Magellanic Clouds
Abstract:
By using the full span of multicolor data on a representative sample
of first overtone RR Lyrae stars in the Large Magellanic Cloud (LMC),
we revisit the problem of the incidence rate of the
amplitude/phase-modulated (Blazhko) stars. Methods. Multicolor data,
obtained by the MAssive Compact Halo Objects (MACHO) project, are
utilized through a periodogram averaging method.
Multicolor data, obtained by the MAssive Compact Halo Objects (MACHO)
project, are utilized through a periodogram averaging method.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 108 1354 Notebook of the analysis
table7.dat 56 99 Data on the first overtone Blazhko stars
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See also:
http://wwwmacho.mcmaster.ca/Data/MachoData.html : MACHO on-line database
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)
J/AJ/127/334 : MACHO LMC first-overtone RR Lyrae variables (Alcock+, 2004)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- MACHO MACHO designation (NN-NNNNN-NNNN)
15- 23 F9.7 d Per Period
25- 31 A7 --- Type1 Type from "r" data, 6.5years time base, same
dataset as Alcock et al., 2000,
Cat. J/ApJ/542/257 (1)
33- 43 A11 --- Type2 Type from "r" and "b" data, 6.5years time base,
with Spectrum Averaging Method (SAM) (1)
45- 54 A10 --- Type3 Type from "r" and "b" data, 7.5years time base,
with Spectrum Averaging Method (SAM) (1)
56-108 A53 --- Com Comments
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Note (1): Types as follows:
RR1-S = Single-periodic overtone RR Lyrae
RR1-BL1 = RR1 with one close component
RR1-BL2 = RR1 with symmetric frequencies
RR1-MC = RR1 with more close components
RR1-PC = RR1 with period change
RR1-D = RR1 with frequencies at integer d-1
RR1-MI = RR1 with some miscellany
RR01 = FU/FO double-mode RR Lyrae
RR01-BL1 = RR0/1 with one close component
RR01-PC = RR0.1 with symmetric frequencies
RR0-S = Fundamental mode RR Lyrae
RR0-BL1 = RR0 with one close component
RR0-BL2 = RR0 with symmetric frequencies
MDM = Mysterious double-mode
BI = Eclipsing binary
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- MACHO MACHO designation (NN-NNNNN-NNNN)
17- 25 F9.7 d P1 First overtone period
27- 35 F9.6 1/d fBL Modulation (Blazhko) frequency (1)
37- 42 F6.4 mag A+ ?=- Larger frequency (modulation amplitude) (2)
44- 49 F6.4 mag A0 Amplitude of the main pulsation (2)
51- 56 F6.4 mag A- ?=- Smaller frequency (modulation amplitude) (2)
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Note (1): The sign of the modulation frequency fB is positive if A-<A+,
and negative, if A->A+. For BL2 stars, fBL stands for the
average of the two modulation frequencies.
Note (2): Amplitudes are given in MACHO instrumental "b" magnitudes
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 18-Jan-2007