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HD 85017


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A photometric study of the light variations of the triple system DG Leo
Multi-site and multi-year differential photometry of the triple star DGLeo reveals a complex frequency spectrum that can be modelled as thecombination of at least three δ Scuti type frequencies in therange 11.5-13 c/d (with semi-amplitudes of 2-7 mmag) and a superimposedslow variability of larger amplitude. The period of the slow variationfits very well with half the orbital period of the inner spectroscopicbinary indicating the presence of ellipsoidal variations caused by thetidally deformed components in a close configuration. These findings,together with the results of a recent spectroscopic analysis (showingthat the system consists of a pair of mild Am stars and one A-typecomponent of normal solar composition), infer that DG Leo is anextremely interesting asteroseismic target. Identification of whichcomponent(s) of this multiple system is (or are) pulsating anddetermination of the excited pulsation modes will both contribute to amuch better understanding of the non-trivial link between multiplicity,chemical composition, rotation, and pulsation in the lower part of theclassical Cepheid instability strip.

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Observation and Astrometry data

Constellation:しし座
Right ascension:09h49m33.09s
Declination:+20°47'38.7"
Apparent magnitude:7.741
Distance:151.976 parsecs
Proper motion RA:-54.1
Proper motion Dec:-74.6
B-T magnitude:8.956
V-T magnitude:7.842

Catalogs and designations:
Proper Names
HD 1989HD 85017
TYCHO-2 2000TYC 1417-315-1
USNO-A2.0USNO-A2 1050-06136437
HIPHIP 48197

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