TWO-COMPONENT VARIABILITY OF THE SEMI-REGULAR PULSATING STAR U DELPHINI
Дата
2012
Науковий керівник
Укладач
Редактор
Назва журналу
Номер ISSN
Номер E-ISSN
Назва тому
Видавець
Astroprint
Анотація
ABSTRACT. Photometric analysis of photometric
variability of the semi-regular pulsating variable U Del is analyzed. From the international AFOEV database, 6231
brightness values in the time interval JD 2451602-55378 were chosen. For the periodogram analysis, we have used
a trigonometric polynomial fit. Using the criterion of
minimal variance of the approximation at arguments of observations, the optimal degree is s=1. Initial epoch for maximum is T0=JD2453340±3, the period P=1198±4 .
Mean brightness at maximum is 6.624
d±0.005, at minimum 7.124±0.005, i.e. the amplitude is 0.499±0.005m. Besides
this slow variability, there is a faster oscillation of a period of 119.45±0.06d, amplitude 0.303±0.005 and an initial epoch for maximum 2453215.1m±0.5. These results are
mean during the time interval after that analyzed in the catalogue of Chinarova and Andronov (2000). Also the method of “running sines” with a filter half-width Δt=0.5P. The local mean (averaged over a short period) brightness varies in a range 6.58-7.41 , the semiamplitude exhibits very strong variations from 0.01 to 0.46 . The phase is also variable – typically of a full amplitude
of 0.5. Close to JD 2452589, occurred a phase
jump by a complete period during a descending branch of
a slow wave. This effect was not observed during other cycles. No significant correlation between mean brightness
and amplitude of short-period oscillation was found.
Despite significant variability of amplitude, the periodic
contribution is not statistically significant. Also characteristics
of individual brightness extrema were found.
m
m The study was made in a course of the international project “Inter-Longitude Astronomy" (Andronov et al., 2010) and national project "Ukrainian Virtual Observatory(Vavilova et al., 2012).
Опис
Odessa Astronomical publications / Одесская астроном. обсерватория . – Одесса : Астропринт, 2012 . – Vol.25/2.
Ключові слова
Stars, variable, pulsating, semiregular, individual: U Del
Бібліографічний опис
Odessa Astronomical Publications