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J/A+AS/126/401      M 31 Cepheids periods                        (Magnier+ 1997)
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Cepheids as tracers of star formation in M 31.
I. Observations and identifications.
     Magnier E.A., Augusteijn T., Prins S., van Paradijs J., Lewin W.H.G.
    <Astron. Astrophys. Suppl. Ser. 126, 401 (1997)>
    =1997A&AS..126..401M      (SIMBAD/NED BibCode)
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ADC_Keywords: Stars, variable ; Magnitudes
Keywords: (stars: variables:) Cepheids - stars: formation -
          galaxies: individual: M 31 - galaxies: stellar content -
          (cosmology:) distance scale

Abstract:
    Cepheid variables can be used for more than just a distance indicator.
    Since the age can be determined from the period, they can be used to
    trace the star formation history of a galaxy. We have identified 130
    new Cepheid variable candidates in M 31, particularly along the spiral
    arm regions in the north-east of the galaxy. These areas had not been
    searched for Cepheids in the previous study by Baade and
    collaborators. The contamination of our sample by other types of
    variables is low (<3%). For V<21, the completeness is =~53%. These
    Cepheids will be used to explore the star formation history in M 31.

File Summary:
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 FileName       Lrecl    Records   Explanations
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ReadMe             80          .   This file
table1.dat         46        130   New M31 Cepheid Candidate Identifications
figure5.ps         61      10727  *Light curves of New Cepheid Candidates
figure6.ps         61      11224   Light curves of New Cepheid Candidates
figure7.ps         61      10948   Light curves of New Cepheid Candidates
figure8.ps         61      12624   Light curves of New Cepheid Candidates
figure9.ps         61      11926   Light curves of New Cepheid Candidates
figure10.ps        61       5631   Light curves of New Cepheid Candidates
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Note on figure5.ps: All 6 figures show the V lightcurves of the candidate
  Cepheids. A pair of dashed lines show the 1 sigma range of V (max).
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label     Explanations
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   1-  3  I3    ---     ID        Identification number
   5- 11  F7.4  deg     RAdeg     Right ascension (J2000)
  13- 19  F7.4  deg     DEdeg     Declination (J2000)
  21- 25  F5.2  mag     Vmag      Maximum V magnitude
  27- 30  F4.2  mag   e_Vmag      rms uncertainty on Vmag
  32- 35  F4.1  d       Per       Period
  37- 40  F4.1  d     e_Per       rms uncertainty on Per
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Acknowledgements: Eugene Magnier <gene@pikake.astro.washington.edu>
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(End)                                         Patricia Bauer [CDS]   15-Sep-1997