Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.210..215j&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 210, no. 1-2, p. 215-217 (IAU Colloquium 134)
Astronomy and Astrophysics
Astrophysics
1
Periodic Variations, Radial Velocity, Stellar Evolution, Stellar Mass, Stellar Oscillations, Chaos, Main Sequence Stars, Pulsed Radiation, Stellar Models
Scientific paper
Due to the large fluctuation of the time of light maxima, in each observational season only very few observations are very dangerous for period variation research. Especically when the observation is not accurate enough, such as for the early radial velocity data. Of course parts of the fluctuation are real which are caused by the chaotic behavior of the complicated pulsation. Generally the pulsation is quite periodic but is not like a timer such as the oscillation of the quartz or the rotating of the pulsar, all of these are much simpler. The period increasing rate of BW Vul form our results is 0.34 micron days per year which makes a evolution time scale about 3 million years. For a star with mass of 10 solar mass, the life age on the main sequence is about 10 million years. So BW Vul should not be very far away from the main sequence. The fomula for calculation of the time of light maxima is given.
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