Images of two DQ white dwarfs

DOI

The intensity profiles of the C2 Swan bands in cool DQ white dwarfs cannot be adequately fitted with models that otherwise succesfully reproduce spectral features of the molecule CH in these stars. Initial modelling showed that a two-component atmosphere in the style of a spot might be able to solve the problem. We photometrically observed the two cool DQ white dwarfs GJ1117 and EGGR78 to search for variability caused by stellar spots. We have not found any such variability, but we estimate the effects of hypothetical spots on lightcurves. We also estimate detection probabilities for spots in different configurations. Alternative explanations of the problem are needed and briefly discussed.

Cone search capability for table J/A+A/544/L6/table1 (Observing log)

Cone search capability for table J/A+A/544/L6/images (List of all FITS images, in "fits" subdirectory)

Associated data

Identifier
DOI http://doi.org/10.26093/cds/vizier.35449006
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/A+A/544/L6
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/544/L6
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/544/L6
Related Identifier https://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/544/L6
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/A+A/544/L6
Provenance
Creator Vornanen T.; Berdyugin A.
Publisher CDS
Publication Year 2012
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysics and Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy