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

Published online by Cambridge University Press:  12 August 2011

C. A. Engelbrecht ,
F. A. M. Frescura ,
B. S. Frank  and
P. R. Nicol
C. A. Engelbrecht
Affiliation:
Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006, South Africa email: [email protected]
F. A. M. Frescura
Affiliation:
School of Physics, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg 2050, South Africa email: [email protected]
B. S. Frank
Affiliation:
School of Physics, University of the Witwatersrand, Private Bag 3, WITS, Johannesburg 2050, South Africa email: [email protected]
P. R. Nicol
Affiliation:
Department of Physics, University of Johannesburg, P.O. Box 524, Auckland Park, Johannesburg 2006, South Africa email: [email protected]
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Abstract

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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.

Keywords

stars: variables: roApdelta Scutistars: HD75445
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S271: Astrophysical Dynamics: From Stars to Galaxies , June 2010 , pp. 377 - 378
Copyright
Copyright © International Astronomical Union 2011

References

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