Revision of the phenomenological characteristics of the algol-type stars using the nav algorithm
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Дата
2015
Науковий керівник
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Одеський національний університет імені І. І. Мечникова
Анотація
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 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
Опис
Ключові слова
Stars: variable – stars, eclipsing
Бібліографічний опис
Odessa Astronomical publications = Одесские астрономические публикации = Одеські астрономічні публікації