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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
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:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table5.dat       108     1354   Notebook of the analysis
table7.dat        56       99   Data on the first overtone Blazhko stars


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

   Bytes Format Units   Label    Explanations

   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

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


Byte-by-byte Description of file: table7.dat

   Bytes Format Units   Label   Explanations

   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)

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



History:
    From electronic version of the journal
(End)                                      Patricia Vannier [CDS]    18-Jan-2007