DETERMINATION OF CHARACTERISTIC TIME SCALES IN SEMI-REGULAR STARS: COMPARISON OF DIFFERENT METHODS

Автор(и)

  • I. L. Andronov Department of Astronomy and Astronomical observatory, Odessa National University, T.G.Shevchenko park, Odessa 65014, Ukraine, Україна
  • L. L. Chinarova Department of Astronomy and Astronomical observatory, Odessa National University, T.G.Shevchenko park, Odessa 65014, Ukraine, Україна

DOI:

https://doi.org/10.18524/1810-4215.2001.14.99142

Ключові слова:

Stars, variable, semi-regular, S Aql

Анотація

Results of the analysis of the characteristic time scales using the periodogram, scalegram and the wavelet analysis are compared for 173 stars most actively observed by the members of the AFOEV and VSOLJ. The periodogram analysis is more effective for stars with stable nearly coherent pulsations, whereas the wavelet analysis is a better tools for stars with switching pulsational modes, e.g. AF Cyg. The scalegram analysis is effective for non-harmonic and chaotic-like variations. The diagrams of the effective time scales obtained using these methods are analyzed for making additional classification of the stars within subclasses. The use of the test functions for automatic classification is discussed. An example analysis is made for S Aql. Particularly, the ephemeris is determined: Max.JD = 2443578.9(3) + 146.d693(6) · E.

Посилання

Andronov I.L.: 1994, Odessa Astron.Publ. (OAP), 7, 49.

Andronov I.L.: 1997, As. Ap. Suppl. Ser., 125, 207.

Andronov I.L.: 1998, Kinematika i Fizika Nebesnykh Tel, 14, N 6, 490.

Andronov I.L.: 1999, in: "Self-Similar Systems", eds. V.B. Priezzhev, V.P. Spiridonov, Dubna, JINR, 57.

Andronov I.L.: 2001a, OAP, 14, 255.

Andronov I.L.: 2001, Time Series Analysis of Astronomical Signals (in Russian), Odessa, Astroprint (in press).

Andronov I.L., Chinarova L.L.: 2000, OAP, 13, 116.

Chinarova L.L.: 1998, Proc. 29th Conf. Variable Star Res., ed. J.Dusek, M.Zejda, Brno, p.38.

Foster G.: 1996, Astron. J., 112, 1709.

Kalimeris A., Rovithis-Livaniou H., Rovithis P.: 1994, As. Ap., 282, 775

Kopal Z., Kurth R.: 1957, Z.Astrophys., 42, 90.

Marsakova V.I., Andronov I.L.: 1996, OAPubl., 9, 127.

MarsakovaV.I., Andronov I.L.: 1998, OAPubl., 11, 79.

Marsakova V.I., Andronov I.L.: 2001, OAPubl., 13, 82.

Terebizh V.Yu.: 1992, Time Series Analysis in Astrophysics (in Russian), Moscow, Nauka.

Tsessevich V.P.: 1970: Variable stars and methods for their study (in Russian), Moscow, Nauka.

##submission.downloads##

Опубліковано

2017-04-20

Номер

Том 14 (2001)

Розділ

Статті

Ліцензія

Авторське право (c) 2017 Odessa Astronomical Publications

Creative Commons License

Ця робота ліцензується відповідно до Creative Commons Attribution-NonCommercial 4.0 International License.

Відповідно Закону України про авторське право і суміжні права N 3792-XII від 23 грудня 1993 року