REVISION OF THE PHENOMENOLOGICAL CHARACTERISTICS OF THE ALGOL-TYPE STARS USING THE NAV ALGORITHM
Journal Title: Odessa Astronomical Publications - Year 2015, Vol 28, Issue 2
Abstract
Phenomenological characteristics of the sample of the Algol – type stars are revised using a recently developed NAV (“New Algol Variable”) algorithm (2012Ap.....55..536A, 2012arXiv 1212.6707A) and compared to that obtained using common methods of Trigonometric Polynomial Fit (TP) or local Algebraic Polynomial (A) fit of a fixed or (alternately) statistically optimal degree (1994OAP.....7...49A, 2003ASPC..292..391A). The computer program NAV is introduced, which allows to determine the best fit with 7 “linear” and 5 “nonlinear” parameters and their error estimates. The number of parameters is much smaller than for the TP fit (typically 20 – 40, depending on the width of the eclipse, and is much smaller (5 – 20) for the W UMa and β Lyrae – type stars. This causes more smooth approximation taking into account the reflection and ellipsoidal effects (TP2) and generally different shapes of the primary and secondary eclipses. An application of the method to two – color CCD photometry to the recently discovered eclipsing variable 2MASS J18024395 + 4003309 = VSX J180243.9 +400331 (2015JASS...32..101A) allowed to make estimates of the physical parameters of the binary system based on the phenomenological parameters of the light curve. The phenomenological parameters of the light curves were determined for the sample of newly discovered EA and EW – type stars (VSX J223429.3+552903, VSX J223421.4+553013, VSX J223416.2+553424, USNO-B1.0 1347-0483658, UCAC3-191-085589, VSX J180755.6+074711= UCAC3 196-166827). Despite we have used original observations published by the discoverers, the accuracy estimates of the period using the NAV method are typically better than the original ones.
Authors and Affiliations
M. G. Tkachenko, I. L. Andronov, L. L. Chinarova
POSITIONAL CATALOGUES OF SATURN’S AND JUPITER’S MOONS
In the framework of the UkrVO national project (http://ukr-vo.org/) we have started the processing of photographic observations of Saturn’s (S1-S8) and Jupiter’s (J6-J8) moons. Observations were conducted during...
THE CHARACTERISTICS OF ELECTRON-NUCLEAR MODEL IN THE DEGENERATE DWARFS THEORY. EQUATION OF STATE
Within the microscopic theory the ground state energy of spatially homogeneous degenerate relativistic subsystem of electrons in the field of stationary nuclei of l-th sorts with charges z1, . . . , zl was calculated. In...
ON THE INFLUENCE OF MHD TURBULENCE ON THE STRUCTURE OF THE RADIOGALAXY LOBES
There is considered the evolution of the shape for the radio galaxy lobes of FRI and FRII types from the point of view on changing the configuration of large-scale structure of magnetic field, and energy transport in the...
ASTEROIDS EXPLORATION WITH BALDONE SCHMIDT TELE-SCOPE
CCD observations of asteroids were obtained in 2008 with the Baldone Schmidt telescope (aperture/ diameter/focal length = 80/120/240 cm) at the Baldone Astrophysical observatory (code 069) of the Institute of Astronomy o...
ASTROINFORMATICS AS A NEW RESEARCH FIELD: UKRVO AND VIRGO RESOURCES
The data-oriented astronomy has allowed classifying the Astroinformatics as a new academic research field, which covers various multi-disciplinary applications of the e-Astronomy. Among them are the data modeling, d...