Hostname: page-component-7c8c6479df-94d59 Total loading time: 0 Render date: 2024-03-28T22:29:21.091Z Has data issue: false hasContentIssue false

Multi-season photometry of the newly-discovered roAp star HD75445

Published online by Cambridge University Press:  12 August 2011

C. A. Engelbrecht
Affiliation:
Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006, South Africa email: chrise@uj.ac.za
F. A. M. Frescura
Affiliation:
School of Physics, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg 2050, South Africa email: fabio.frescura@wits.ac.za
B. S. Frank
Affiliation:
School of Physics, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg 2050, South Africa email: fabio.frescura@wits.ac.za
P. R. Nicol
Affiliation:
Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006, South Africa email: chrise@uj.ac.za
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

HD75445 was recently announced by Kochukhov et al. (2009) to be a low-amplitude roAp star, based on spectroscopic measurements. We present putative pulsation frequencies of HD75445 determined from 22 hours of Johnson B photometry obtained in 2008, 2009 and 2010. We present the first photometric periodicities detected in this star. We make a marginal detection of one of Kochukhov et al. (2009)'s spectroscopic periods, along with a range of confidently detected periodicities covering the low-frequency end of the roAp instability spectrum and the high-frequency end of the Delta Scuti instability spectrum.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2011

References

Balona, L. A., and 11 co-authors 2010, arXiv:1006.4013v1Google Scholar
Dupret, M.-A., Théado, S., & Noels, A. 2008, J. Phys. Conf. Ser., 118, 012052CrossRefGoogle Scholar
Kochukhov, O., Bagnulo, S., Lo Curto, G., & Ryabchikova, T. 2009, A & A, 493, L4548CrossRefGoogle Scholar
Kochukhov, O. & Bagnulo, S. 2006, A & A, 450, 763CrossRefGoogle Scholar
Lenz, P. & Breger, M. 2005, CoAst, 146, 53Google Scholar
Théado, S., Dupret, M.-A., Noels, A. & Ferguson, J.W. 2009 A& A, 493, 159Google Scholar