Hostname: page-component-76fb5796d-vfjqv Total loading time: 0 Render date: 2024-04-26T18:57:21.056Z Has data issue: false hasContentIssue false
  • English
  • Français

The Light Curves of Double-Mode Cepheids: The CO Aur Case

Published online by Cambridge University Press:  08 February 2017

E. Poretti  and
I. Pardo
E. Poretti
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 22055 Merate, Italy
I. Pardo
Affiliation:
Osservatorio Astronomico di Brera, Via E. Bianchi 46, 22055 Merate, Italy

Extract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

In two recent papers (Pardo & Poretti 1997; Poretti & Pardo 1997) we analyzed all the available photometry of galactic double-mode Cepheids (DMCs) with the aim of detecting in each case the importance of the harmonics and of the cross coupling terms. We found that no a priori fit can be reliably applied to the measurements of a DMC, but a careful frequency analysis must be done to evaluate the importance of each term. As a further application of this technique, we obtained very precise indications about the properties of the Fourier parameters. When discussing the generalized phase differences Gi,j we demonstrated that plotting them as a function of the order |i|+|j|, there are well-defined regions where they are confined: the second order terms have π < Gi,j < 3π/2; the third order terms have π/2 < Gi,j < π; the fourth order terms cluster around 2π.

Type
VI. Asteroseismology II
Information
Symposium - International Astronomical Union , Volume 185: New Eyes to See Inside the Sun and Stars , 1998 , pp. 389 - 390
Copyright
Copyright © Kluwer 1998 

References

Antonello, E., Kanbur, S.M. (1997), The characteristics of second–overtone mode Cepheids predicted by non–linear pulsation modes, Monthly Notices Royal Astron. Soc., Vol. no. 286, pp. L33–L37 Google Scholar
Antonello, E., Poretti, L., Reduzzi, L. (1990), The separation of s–Cepheids from classical Cepheids and a new definition of the class, Astron. Astrophys. Vol. no. 236, pp. 138–148 Google Scholar
Pardo, I., Poretti, E. (1997), The galactic double–mode Cepheids. I. Frequency analysis of the light curves and comparison with single–mode Cepheids, Astron. Astrophys. Vol. no. 324, pp. 121–132 Google Scholar
Poretti, E., Pardo, I. (1997), The galactic double–mode Cepheids. II. Properties of the generalized phase differences, Astron. Astrophys. Vol. no. 324, pp. 133–136 Google Scholar