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Frequency Analysis of a Subset of Fundamental Mode RR Lyrae Stars from the MACHO Project Large Magellanic Cloud Database

Published online by Cambridge University Press:  12 April 2016

D.L. Welch ,
G. Kovács ,
K.H. Cook ,
C. Alcock ,
R. Allsman ,
D.R. Alves ,
T. Axelrod ,
A. Becker ,
D. Bennett  and
A. Drake
...Show all authors
D.L. Welch
Affiliation:
Dept. of Physics and Astronomy, McMaster Univ., Hamilton, L82 4M1, Canada IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
G. Kovács
Affiliation:
Konkoly Observatory, P.O. Box 67, H-1525 Budapest, Hungary
K.H. Cook
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
C. Alcock
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA Dept. of Physics and Astronomy, Univ. of Pennsylvania, Philadelphia, PA 19104USA
R. Allsman
Affiliation:
MSO, RSSA, Australian Nat. Univ., Weston Creek, ACT 0200, Australia
D.R. Alves
Affiliation:
Space Telescope Science Institute, Baltimore, MD 21218, USA
T. Axelrod
Affiliation:
MSO, RSSA, Australian Nat. Univ., Weston Creek, ACT 0200, Australia
A. Becker
Affiliation:
Bell Labs, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974USA
D. Bennett
Affiliation:
Department of Physics, University of Notre Dame, South Bend, IN 46556, USA
A. Drake
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
K. Freeman
Affiliation:
MSO, RSSA, Australian Nat. Univ., Weston Creek, ACT 0200, Australia
M. Geha
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
K. Griest
Affiliation:
Department of Physics, University of California, San Diego, CA 92093, USA
M. Lehner
Affiliation:
Dept. of Physics and Astronomy, Univ. of Pennsylvania, Philadelphia, PA 19104USA
S. Marshall
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
D. Minniti
Affiliation:
Department Astronomia, Universidad Catolica, Chile
C. Nelson
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA Department of Physics, University of California, Berkeley, CA 94720, USA
B. Peterson
Affiliation:
MSO, RSSA, Australian Nat. Univ., Weston Creek, ACT 0200, Australia
P. Popowski
Affiliation:
IGPP, Lawrence Livermore Nat. Lab., Livermore, CA 94550, USA
M. Pratt
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA 98195, USA
P. Quinn
Affiliation:
European Southern Observatory, Garching, D-85748, Germany
A. Rodgers
Affiliation:
deceased
C. Stubbs
Affiliation:
Department of Astronomy, University of Washington, Seattle, WA 98195, USA
W. Sutherland
Affiliation:
Department of Physics, Oxford University, 0X1 3RH, England
T. Vandehei
Affiliation:
Department of Physics, University of California, San Diego, CA 92093, USA

Abstract

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We present the preliminary results of a frequency analysis of 1457 fundamental mode RR Lyrae (RR0) stars in the Large Magellanic Cloud (LMC) from MACHO Project photometry. We find the same classes of pulsational behavior as were found in our earlier survey of first overtone RR Lyrae (RR1) stars. Variables whose prewhitened power spectra contain one or two peaks close to the main frequency component in the original power spectra are commonly known as Blazhko-type variables. The present analysis shows the overall frequency of Blazhko-type stars in the total RR0 population analysed to date to be ≈ 10%. This is lower than the often cited Galactic field/globular rate of 20-30% (Szeidl, 1988).

The incidence rate of Blazhko-type variability in the LMC appears to be about three times higher in RR0 stars than in RR1 stars. This puts important constraints on possible models of the Blazhko effect.

Type
Part 3. Nonlinear Effects in Pulsating Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 412 - 413
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Alcock, , et al. (the MACHO collaboration) 2000, ApJ, 542, 257 Google Scholar
Blazhko, S. 1907. Astron. Nachr., 175, 325 CrossRefGoogle Scholar
Szeidl, B. 1988, in Multimode Stellar Pulsations, eds. Kovács, G., Szabados, L. & Szeidl, B., (Kultúra, Konkoly Observatory), 45 Google Scholar