000002057 001__ 2057
000002057 005__ 20160701171658.0
000002057 0247_ $$2DOI$$a10.1051/0004-6361:20042335
000002057 037__ $$aASTROimport-214
000002057 100__ $$aLampens, P.
000002057 245__ $$aA photometric study of the light variations of the triple system DG Leo
000002057 260__ $$c2005
000002057 520__ $$aMulti-site and multi-year differential photometry of the triple star DG Leo reveals a complex frequency spectrum that can be modelled as the combination of at least three δ Scuti type frequencies in the range 11.5-13 c/d (with semi-amplitudes of 2-7 mmag) and a superimposed slow variability of larger amplitude. The period of the slow variation fits very well with half the orbital period of the inner spectroscopic binary indicating the presence of ellipsoidal variations caused by the tidally deformed components in a close configuration. These findings, together with the results of a recent spectroscopic analysis (showing that the system consists of a pair of mild Am stars and one A-type component of normal solar composition), infer that DG Leo is an extremely interesting asteroseismic target. Identification of which component(s) of this multiple system is (or are) pulsating and determination of the excited pulsation modes will both contribute to a much better understanding of the non-trivial link between multiplicity, chemical composition, rotation, and pulsation in the lower part of the classical Cepheid instability strip.
000002057 700__ $$a Frémat, Y.
000002057 700__ $$a Garrido, R.
000002057 700__ $$a Peña, J. H.
000002057 700__ $$a Parrao, L.
000002057 700__ $$a van Cauteren, P.
000002057 700__ $$a Cuypers, J.
000002057 700__ $$a De Cat, P.
000002057 700__ $$a Uytterhoeven, K.
000002057 700__ $$a Arentoft, T.
000002057 700__ $$a Hobart, M.
000002057 773__ $$c201-209$$i1$$pAstronomy and Astrophysics$$v438$$y2005
000002057 85642 $$ahttp://esoads.eso.org/abs/2005A%26A...438..201L
000002057 905__ $$apublished in
000002057 980__ $$aREFERD