Long-term photographic photometry of HK Lac Virtual Observatory Resource

Authors
  1. Froehlich H.-E.
  2. Kroll P.
  3. Strassmeier K.G.
  4. Published by
    CDS
Abstract

Long-term photographic photometry of the active long-period RS CVn binary HK Lac (HD 209813) was obtained from more than 2000 Sonneberg Sky-Patrol plates taken between 1956 and 1996. We achieve an internal accuracy of 0.07mag. The correspondence with contemporaneous high-precision photoelectric photometry from automatic telescopes is striking and successfully demonstrates the feasibility of our approach. Based on a Bayesian periodogram analysis, we improve previously published cycle periods to 13.37+/-0.8 and 6.7+/-0.1-years, and present evidence of an additional period of 9.48+/-0.13-years. This establishes the multi-periodicity of dynamo action in these overactive stars as compared to the Sun. Of course, the 6.7-years cycle may be an overtone of the dominating 13.4-years cycle. Our long-term photographic photometry even allowed the detection of the star's mean rotational period of 24.35-days.

Keywords
  1. late-type-stars
  2. visible-astronomy
  3. photographic-photometry
  4. photometric-systems
Bibliographic source Bibcode
2006A&A...454..295F
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/454/295
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/454/295
Document Object Identifer DOI
doi:10.26093/cds/vizier.34540295

Access

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https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/454/295
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/454/295
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History

2006-12-20T15:57:19Z
Resource record created
2006-12-20T15:57:19Z
Created
2017-06-29T08:55:37Z
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