S-index and Stroemgren LC of HD30495 Virtual Observatory Resource

Authors
  1. Egeland R.
  2. Metcalfe T.S.
  3. Hall J.C.
  4. Henry G.W.
  5. Published by
    CDS
Abstract

A growing body of evidence suggests that multiple dynamo mechanisms can drive magnetic variability on different timescales, not only in the Sun but also in other stars. Many solar activity proxies exhibit a quasi-biennial (~2yr) variation, which is superimposed upon the dominant 11 year cycle. A well-characterized stellar sample suggests at least two different relationships between rotation period and cycle period, with some stars exhibiting long and short cycles simultaneously. Within this sample, the solar cycle periods are typical of a more rapidly rotating star, implying that the Sun might be in a transitional state or that it has an unusual evolutionary history. In this work, we present new and archival observations of dual magnetic cycles in the young solar analog HD 30495, a ~1Gyr old G1.5V star with a rotation period near 11 days. This star falls squarely on the relationships established by the broader stellar sample, with short-period variations at ~1.7yr and a long cycle of ~12yr. We measure three individual long-period cycles and find durations ranging from 9.6 to 15.5yr. We find the short-term variability to be intermittent, but present throughout the majority of the time series, though its occurrence and amplitude are uncorrelated with the longer cycle. These essentially solar-like variations occur in a Sun-like star with more rapid rotation, though surface differential rotation measurements leave open the possibility of a solar equivalence.

Keywords
  1. visible-astronomy
  2. medium-band-photometry
  3. g-stars
Bibliographic source Bibcode
2015ApJ...812...12E
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/812/12
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/812/12
Document Object Identifer DOI
doi:10.26093/cds/vizier.18120012

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/812/12
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/812/12
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/812/12
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2016-02-22T13:07:12Z
Resource record created
2016-02-22T13:07:12Z
Created
2017-06-20T13:16:11Z
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