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RV Tauri Stars and Type II Cepheids in the Magellanic Clouds - Results from the MACHO Database

Published online by Cambridge University Press:  12 April 2016

Karen R. Pollard ,
C. Alcock ,
R. A. Allsman ,
D. Alves ,
T. S. Axelrod ,
A. C. Becker ,
D. P. Bennett ,
K. H. Cook ,
K. C. Freeman  and
K. Griest
...Show all authors
Karen R. Pollard
Affiliation:
Department of Physics and Astronomy, University of Canterbury, Private Bag 4800, Christchurch 8020, New Zealand
C. Alcock
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA
R. A. Allsman
Affiliation:
Supercomputing Facility, Australian National University, Canberra, ACT 0200, Australia
D. Alves
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA Supercomputing Facility, Australian National University, Canberra, ACT 0200, Australia Department of Physics, University of California, Davis, CA 95616, USA
T. S. Axelrod
Affiliation:
Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston Creek, ACT 2611, Australia
A. C. Becker
Affiliation:
Departments of Astronomy and Physics, University of Washington, Seattle, WA 98195, USA
D. P. Bennett
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA Department of Physics, University of Notre Dame, South Bend, IN 46556, USA
K. H. Cook
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA
K. C. Freeman
Affiliation:
Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston Creek, ACT 2611, Australia
K. Griest
Affiliation:
Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA Department of Physics, University of California, San Diego, La Jolla, CA 92093, USA
M. J. Lehner
Affiliation:
Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA Department of Physics, University of Sheffield, Sheffield, S3 7RH, U.K.
S. L. Marshall
Affiliation:
Lawrence Livermore National Laboratory, Livermore, CA 94550, USA Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA Department of Physics, University of California, Santa Barbara, CA 93106, USA
B. A. Peterson
Affiliation:
Mt. Stromlo and Siding Spring Observatories, Australian National University, Weston Creek, ACT 2611, Australia
M. R. Pratt
Affiliation:
Center for Particle Astrophysics, University of California, Berkeley, CA 94720, USA Departments of Astronomy and Physics, University of Washington, Seattle, WA 98195, USA LIGO Project, MIT, Rm 20B-145, Cambridge, MA 02139, USA
P. J. Quinn
Affiliation:
European Southern Observatory, Karl-Schwarzschild Str. 2, D-85748, Garching, Germany
W. Sutherland
Affiliation:
Department of Physics, University of Oxford, Oxford OX1 3RH, U.K.
A. Tomaney
Affiliation:
Departments of Astronomy and Physics, University of Washington, Seattle, WA 98195, USA
D. L. Welch
Affiliation:
Department of Physics & Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

Abstract

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A review of the properties of Type II Cepheids and RV Tauri stars in the Magellanic Clouds is presented. In the behaviour of their light and colour curves, the RV Tauri stars appear to be a direct extension of the Type II Cepheids to longer periods. A single P – L – C relationship describes both the Type II Cepheids and RV Tauri stars in the LMC. The derived high intrinsic magnitudes for the RV Tauri variables supports the proposition that these objects are luminous stars evolving off the AGB. Preliminary analysis of the long time-series MACHO photometry indicates one star (MACHO*05:37:45.0–69:54:16) has an obvious ‘period-quadrupled’ periodicity, which is supporting evidence for a period-doubling bifurcation transition to chaotic pulsations.

Type
Part 2. Variability of High-Luminosity Stars
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 89 - 95
Copyright
Copyright © Astronomical Society of the Pacific 2000

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