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K 1-6: An Asymmetric Planetary Nebula with a Binary Central Star

Published online by Cambridge University Press:  02 January 2013

David J. Frew*
Affiliation:
Department of Physics and Astronomy, Macquarie University, North Ryde, NSW 2109, Australia
Jeff Stanger
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Michael Fitzgerald
Affiliation:
Department of Physics and Astronomy, Macquarie University, North Ryde, NSW 2109, Australia
Quentin Parker
Affiliation:
Department of Physics and Astronomy, Macquarie University, North Ryde, NSW 2109, Australia Australian Astronomical Observatory, PO Box 296, Epping, NSW 1710, Australia
Lena Danaia
Affiliation:
School of Teacher Education, Charles Sturt University, Bathurst, NSW 2795, Australia
David McKinnon
Affiliation:
School of Teacher Education, Charles Sturt University, Bathurst, NSW 2795, Australia
Martín A. Guerrero
Affiliation:
Instituto de Astrofísica de Andalucía, CSIC, c/Camino Bajo de Huétor 50, E-18008 Granada, Spain
John Hedberg
Affiliation:
Department of Education, Macquarie University, North Ryde, NSW 2109, Australia
Robert Hollow
Affiliation:
CSIRO Astronomy and Space Science, PO Box 76, Epping, NSW 1710, Australia
Yvonne An
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Shu Han Bor
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Isabel Colman
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Claire Graham-White
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Qing Wen Li
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Juliette Mai
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Katerina Papadakis
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Julia Picone-Murray
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Melanie Vo Hoang
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
Vivian Yean
Affiliation:
Sydney Girls High School, Anzac Parade, Surry Hills, NSW 2010, Australia
*
ICorresponding author. Email: [email protected]
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Abstract

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We present new imaging data and archival multiwavelength observations of the little-studied emission nebula K 1-6 and its central star. Narrow-band images inHα (+[N II]) and [O III] taken with the Faulkes Telescope North reveal a stratified, asymmetric, elliptical nebula surrounding a central star which has the colours of a late G or early K-type subgiant or giant. GALEX ultraviolet images reveal a very hot subdwarf or white dwarf coincident in position with this star. The cooler, optically dominant star is strongly variable with a period of 21.312± 0.008 days, and is possibly a high-amplitude member of the RS CVn class, although an FK Com classification is also possible. Archival ROSAT data provide good evidence that the cool star has an active corona. We conclude that K 1-6 is most likely an old bona fide planetary nebula at a distance of ∼1.0 kpc, interacting with the interstellar medium, and containing a binary or ternary central star. The observations and data analyses reported in this paper were conducted in conjunction with Year 11 high school students as part of an Australian Research Council Linkage Grant science education project, denoted Space To Grow, conducted jointly by professional astronomers, educational researchers, teachers, and high-school students.

Type
Research Article
Copyright
Copyright © Astronomical Society of Australia 2011

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