Journal Article

The cool ZZ Ceti star PG 2303+243: observations and analysis of variability in 2004

E. Pakštienė, J.-E. Solheim, G. Handler, M. Reed, Zs. Bognár, F. Rodler, M. Paparó, J. Zdanavičius, B. Steininger and G. Wolf

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 415, issue 2, pages 1322-1333
Published in print August 2011 | ISSN: 0035-8711
Published online July 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.18781.x
The cool ZZ Ceti star PG 2303+243: observations and analysis of variability in 2004

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PG 2303+243 is a cool DA variable (also called ZZ Ceti) star with a rich pulsation spectrum and variable amplitudes. A mini-campaign involving six observatories yielded time-resolved photometric measurements of PG 2303+243 during the period 2004 September 5–20. A duty cycle of 35 per cent was achieved. We detected 24 possible independent frequencies, their amplitudes and phases for future mode identification. We confirm the occurrence of short-term amplitude and frequency variations. Our analysis suggests an l= 1 rotational splitting around 8.4 μHz, implying a rotation period of 16.5 h.

Keywords: stars: individual: PG 2303+243; stars: variables: general; white dwarfs

Journal Article.  7476 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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