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Long-term Photometric Monitoring of Cool Hydrogen-deficient Carbon Stars

Published online by Cambridge University Press:  12 April 2016

P.L. Cottrell ,
A.C. Gilmore ,
P.M. Kilmartin  and
W.A. Lawson
P.L. Cottrell
Affiliation:
Mount John University Observatory, Dept of Physics & Astronomy, University of Canterbury, Christchurch, New Zealand
A.C. Gilmore
Affiliation:
Mount John University Observatory, Dept of Physics & Astronomy, University of Canterbury, Christchurch, New Zealand
P.M. Kilmartin
Affiliation:
Mount John University Observatory, Dept of Physics & Astronomy, University of Canterbury, Christchurch, New Zealand
W.A. Lawson
Affiliation:
Dept of Physics, University College UNSW, Australian Defence Force Academy, Canberra, Australia

Extract

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Interest in the hydrogen-deficient carbon (HdC) stars, and the R Coronae Borealis (RCB) stars in particular, has been rekindled by the realisation that these stars provide the potential for testing models in a number of areas. These include: pulsation theory; grain formation; grain evolution; stellar nucleosynthesis and extended stellar atmospheres.

Observational work on these objects has increased dramatically over the last 10 years. This has included both spectroscopic and photometric projects, see Lambert & Rao (1994) and Lawson et al. (1990).

We have continued to observe a number of the cool HdC stars in the Galaxy and the LMC and now have light curves exceeding 2000 days in duration for many of these objects. In particular, we are observing the RCB stars to investigate both the low amplitude, pulsation-related variations present at maximum light and the photometric behaviour during the large amplitude declines.

Type
Part 2. Poster Papers
Information
International Astronomical Union Colloquium , Volume 155: Astrophysical Applications of Stellar Pulsation , 1995 , pp. 431 - 432
Copyright
Copyright © Astronomical Society of the Pacific 1995

References

Cottrell, P.L., Lawson, W.A., & Buchhorn, M. 1990, MNRAS, 244, 149 Google Scholar
Lambert, D.L., & Rao, N.K. 1994, J. Astr. Ap., 15, 47 Google Scholar
Lawson, W.A., et al. 1990, MNRAS, 247, 91 Google Scholar
Lawson, W.A., et al. 1992, MNRAS, 256, 339 CrossRefGoogle Scholar
Pugach, A.F. 1977, IBVS, 1277 Google Scholar