DG Leo uvby differential photometry Virtual Observatory Resource

Authors
  1. Lampens P.
  2. Fremat Y.
  3. Garrido R.
  4. Pena J.H.
  5. Parrao L.
  6. Van Cauteren P.,Cuypers J.
  7. De Cat P.
  8. Uytterhoeven K.
  9. Arentoft T.
  10. Hobart M.
  11. Published by
    CDS
Abstract

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 11.5-13c/d (with semi-amplitudes of 2-7mmag) 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.

Keywords
  1. multiple-stars
  2. visible-astronomy
  3. medium-band-photometry
Bibliographic source Bibcode
2005A&A...438..201L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/438/201
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/438/201
Document Object Identifer DOI
doi:10.26093/cds/vizier.34380201

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/438/201
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/438/201
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/438/201
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2005-08-21T15:23:56Z
Resource record created
2005-08-21T15:23:56Z
Created
2017-05-30T07:01:37Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr