Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-05-02
Astronomy and Astrophysics
Astrophysics
10 pages, 5 Postscript figures, uses rotate.sty. Astronomy and Astrophysics, in press (2005)
Scientific paper
10.1051/0004-6361:20042335
Multi-site and multi-year differential photometry of the triple star DG Leo reveals a complex frequency spectrum that can be modelled as the combination of at least three Delta Scuti type frequencies in the range 11.5-13 c/d (with semi-amplitudes of 2-7 mmag) and a superimposed slow variability of larger amplitude. The period of the slow variation fits very well with half the orbital period of the inner spectroscopic binary indicating the presence of ellipsoidal variations caused by the tidally deformed components in a close configuration. These findings, together with the results of a recent spectroscopic analysis (showing that the system consists of a pair of mild Am stars and one A-type component of normal solar composition), infer that DG Leo is an extremely interesting asteroseismic target. Identification of which component(s) of this multiple system is (or are) pulsating and determination of the excited pulsation modes will both contribute to a much better understanding of the non-trivial link between multiplicity, chemical composition, rotation, and pulsation in the lower part of the classical Cepheid instability strip.
Arentoft Torben
Cauteren Van P.
Cuypers Jan
de Cat Peter
Frémat Yves
No associations
LandOfFree
A Photometric Study of the Light Variations of the Triple System DG Leonis does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with A Photometric Study of the Light Variations of the Triple System DG Leonis, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A Photometric Study of the Light Variations of the Triple System DG Leonis will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-479979