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RR Lyrae Stars in the Globular Cluster NGC 6101

Published online by Cambridge University Press:  02 January 2013

M. T. Fitzgerald ,
J. Criss ,
T. Lukaszewicz ,
D. J. Frew ,
M. Catelan ,
S. Woodward ,
L. Danaia  and
D. H. McKinnon
M. T. Fitzgerald*
Affiliation:
Department of Physics & Astronomy, Macquarie University, NSW 2109, Australia Macquarie University Research Centre in Astronomy, Astrophysics & Astrophotonics, Macquarie University, NSW 2109, Australia
J. Criss
Affiliation:
Oakhill College, Castle Hill, NSW 2154, Australia
T. Lukaszewicz
Affiliation:
Oakhill College, Castle Hill, NSW 2154, Australia
D. J. Frew
Affiliation:
Department of Physics & Astronomy, Macquarie University, NSW 2109, Australia Macquarie University Research Centre in Astronomy, Astrophysics & Astrophotonics, Macquarie University, NSW 2109, Australia
M. Catelan
Affiliation:
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Chile
S. Woodward
Affiliation:
Oakhill College, Castle Hill, NSW 2154, Australia
L. Danaia
Affiliation:
Charles Sturt University, Bathurst, NSW 2795, Australia
D. H. McKinnon
Affiliation:
Charles Sturt University, Bathurst, NSW 2795, Australia
*
FCorresponding author. Email: mfitzasp@gmail.com
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Abstract

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V- and I-band observations were taken over 9 months to study the RR Lyrae population in the metal-poor diffuse globular cluster NGC 6101. We identify one new variable, which is either a potential long-period red giant variable or eclipsing binary, and recover all previously identified RR Lyraes. One previously studied RR Lyrae is reclassified as an RRc type, while two period estimations have been significantly refined. We confirm that NGC6101 is Oosterhoff type II with a high ratio of n(c)/n(ab + c) = 0.833 with a very long mean RRab period of 0.86 d. By using theoretical RRLyrae period-luminosity-metallicity relations, we use our V- and I-band RR Lyrae data to gain an independent estimate of the reddening towards this cluster of E(B − V) = 0.15 ± 0.04 and derive a distance of 12.8 ± 0.8 kpc. The majority of the work in this study was undertaken by upper secondary school students involved in the Space to Grow astronomy education project in Australia.

Keywords

globular clusters: individual (NGC 6101)RR Lyrae variable
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 29 , Issue 1 , 2012 , pp. 72 - 77
Copyright
Copyright © Astronomical Society of Australia 2012

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