Hostname: page-component-cc8bf7c57-5wl6q Total loading time: 0 Render date: 2024-12-12T07:57:56.623Z Has data issue: false hasContentIssue false
  • English
  • Français

A photometric search for ‘5-min’ oscillations in the components of Alpha Centauri and two other double stars

Published online by Cambridge University Press:  03 August 2017

L. A. Balona  and
F. Marang
L. A. Balona
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape, South Africa
F. Marang
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, Cape, South Africa

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.

The discovery of global solar 5-min oscillations has prompted the search for such oscillations in other stars. The main problem in detecting these variations is their expected small amplitude (in the sun it is less than 1 m/s in velocity and 10−6 in integrated light). Two recent studies by Fossat et al. (1984) and Noyes et al. (1984) have suggested that the 5-min oscillations in α Cen and ε Eri may have been detected.

We attempted to detect these oscillations by means of conventional broad-band photometry in the components of three double star systems (α Cen, HR4677 and HR5568). We selected these stars because they cover a wide range of spectral types (F2V to M2V). It was hoped that there may be a region where the pulsation amplitudes are particularly large. By using one component of a double star system to correct for transparency variations in the other, we also expected to obtain a larger signal-to-noise ratio.

Type
Chapter 4: Asteroseismology: Results and Prospects
Information
Symposium - International Astronomical Union , Volume 123: Advances In Hello- and Asteroseismology , 1988 , pp. 253 - 254
Copyright
Copyright © Reidel 1988 

References

Fossat, E., Gelly, B. & Grec, C., 1984. Theoretical problems in Stellar Stability and Oscillations, 229.Google Scholar
Noyes, R.W., Baliunas, S.L., Belserene, E., Duncan, D.K., Horne, J. & Widrow, L., 1984. Astrophys. J., 285, L23.Google Scholar