Abstract
We have carried out CCD photometry of KZ Hya from June 2004 to April 2007. With the 45 cm reflecting telescope donated by Japanese Official Development Assistance, we obtained 20 light maxima at the Astronomical Observatory of the National University of Asuncion in Paraguay. In addition, we have partly obtained three light maxima at the Gunma Astronomical Observatory in Japan. We have collected additional maximum data from literatures and data bases. The O − C values of KZ Hya varies sinusoidally with a period of 7.96 years, which supports the binary nature of KZ Hya suggested by some other workers. We have also clearly detected the secondary maximum of 0.03 mag at the phase of 0.66 on the light curve. The secondary maximum is found to have been present at the same phase since 1975 when KZ Hya was discovered as a pulsating variable star.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
American Association of Variable Star Observers: International Database. http://www.aavso.org/. Cited 27 Feb 2007(2004)
The All Sky Automated Survey Data. The ASAS-3 Catalog of Variable Stars. http://archive.princeton.edu/asas/.Cited 16 Mar 2007(2005)
Blake, R. M., Delaney, P., Khosravani, H., Tome, J. and Lightman, M.: PASP 115, 212(2003)
Bonnardeau, M.: http://mbond.free.fr/. Cited 14 May 2007(2007)
Doncel, F., Troche, A. and Noguchi, T.: UNSPA 15, 29(2004)
Hobart, M. A., Peniche, R. And Pena, J. H.: Rev. Mex. Astron. Astrof. 11, 19(1985)
Irwin, J. B.: ApJ. 116, 211(1952)
Liu Yanying, Jiang Shiyang and Cao Ming: IBVS No.3606(1991)
McNamara, D. H. and Budge, K. G.: PASP 97, 322(1985)
Napoleao, T. A.: REA/Brasil REPORTE No.11(2003)
Pojmanski, G.: Acta Astronomica 52, 397(2002)
Przybylski, A. and Bessell, M.S.: Mon. Not. R. astr. Soc. 189, 377(1979)
Variable Star Observers League in Japan: Database. ftp://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/ VSOLJ/database/stars/HYAKZ.ut. Cited 11 Feb 2007(1998)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2010 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Doncel, F., Momiyama, T. (2010). Period Study and Secondary Maximum of KZ Hya. In: Haubold, H., Mathai, A. (eds) Proceedings of the Third UN/ESA/NASA Workshop on the International Heliophysical Year 2007 and Basic Space Science. Astrophysics and Space Science Proceedings. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03325-4_15
Download citation
DOI: https://doi.org/10.1007/978-3-642-03325-4_15
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03388-9
Online ISBN: 978-3-642-03325-4
eBook Packages: Physics and AstronomyPhysics and Astronomy (R0)