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@article{806839,
author = {Zejda, Miloslav and Mikulášek, Zdeněk and Wolf, Marek},
article_location = {Les Ulis Cedex, France},
article_number = {1},
keywords = {stars: binaries: eclipsing; stars: individual: TW Dra; stars: fundamental parameters},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
note = {Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/489/321},
title = {Period study of TW Draconis},
volume = {489},
year = {2008}
}
TY - JOUR
ID - 806839
AU - Zejda, Miloslav - Mikulášek, Zdeněk - Wolf, Marek
PY - 2008
TI - Period study of TW Draconis
JF - Astronomy and Astrophysics
VL - 489
IS - 1
SP - 321-326
EP - 321-326
PB - EDP Sciences
SN - 00046361
N1 - Table 1 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/489/321
KW - stars: binaries: eclipsing
KW - stars: individual: TW Dra
KW - stars: fundamental parameters
N2 - TW Draconis is one of the most well known interacting Algol-type eclipsing binaries. We study time series data for the star accumulated over the past 150 years to detect changes in minima timings. Using 561 available minima timings, we compile an extended O-C diagram analysis. The first part ending around 1942 is characterised by smooth linear/parabolic course of timing residuals. In 1858-1905, the period was almost constant P=2.806513(9)d, but, in 1905-1942, the period increased. We interpret it as a result of continuous mass exchange at the mean rate of 6.9x10^-7 Ms year-1. Since 1942, the system has been showing alternating and shortening period changes with the length of a cycle of about two decades, modulated by short-term periodic variations. The latter small variations with the period 6.5 years are caused by the the presence of a third low-mass body in the system. Major oscillations can be explained as consequences of quadrupole moment variation in the system.
ER -
ZEJDA, Miloslav, Zdeněk MIKULÁŠEK and Marek WOLF. Period study of TW Draconis. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2008, vol.~489, No~1, p.~321-326. ISSN~0004-6361.
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