TWO-COMPONENT VARIABILITY OF THE SEMI-REGULAR PULSATING STAR U DELPHINI

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dc.contributor.authorAndronov, Ivan L.
dc.contributor.authorChinarova, L. L.
dc.date.accessioned2014-03-22T07:36:30Z
dc.date.available2014-03-22T07:36:30Z
dc.date.issued2012
dc.descriptionOdessa Astronomical publications / Одесская астроном. обсерватория . – Одесса : Астропринт, 2012 . – Vol.25/2.uk
dc.description.abstractABSTRACT. 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).uk
dc.identifier.citationOdessa Astronomical Publicationsuk
dc.identifier.urihttps://dspace.onu.edu.ua/handle/123456789/4732
dc.language.isoenuk
dc.publisherAstroprintuk
dc.relation.ispartofseries;vol. 25, issue 2, p. 148-149.
dc.subjectStarsuk
dc.subjectvariableuk
dc.subjectpulsatinguk
dc.subjectsemiregularuk
dc.subjectindividual: U Deluk
dc.titleTWO-COMPONENT VARIABILITY OF THE SEMI-REGULAR PULSATING STAR U DELPHINIuk
dc.typeArticleuk
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Odesa Astronomical Publications