Bibcode
García, R. A.; Ceillier, T.; Salabert, D.; Mathur, S.; van Saders, J. L.; Pinsonneault, M.; Ballot, J.; Beck, P. G.; Bloemen, S.; Campante, T. L.; Davies, G. R.; do Nascimento, J.-D., Jr.; Mathis, S.; Metcalfe, T. S.; Nielsen, M. B.; Suárez, J. C.; Chaplin, W. J.; Jiménez, A.; Karoff, C.
Bibliographical reference
Astronomy and Astrophysics, Volume 572, id.A34, 15 pp.
Advertised on:
12
2014
Journal
Citations
240
Refereed citations
205
Description
Kepler ultra-high precision photometry of long and continuous
observations provides a unique dataset in which surface rotation and
variability can be studied for thousands of stars. Because many of these
old field stars also have independently measured asteroseismic ages,
measurements of rotation and activity are particularly interesting in
the context of age-rotation-activity relations. In particular,
age-rotation relations generally lack good calibrators at old ages, a
problem that this Kepler sample of old-field stars is uniquely suited to
address. We study the surface rotation and photometric magnetic activity
of a subset of 540 solar-like stars on the main-sequence and the
subgiant branch for which stellar pulsations have been measured. The
rotation period was determined by comparing the results from two
different analysis methods: i) the projection onto the frequency domain
of the time-period analysis, and ii) the autocorrelation function of the
light curves. Reliable surface rotation rates were then extracted by
comparing the results from two different sets of calibrated data and
from the two complementary analyses. General photometric levels of
magnetic activity in this sample of stars were also extracted by using a
photometric activity index, which takes into account the rotation period
of the stars. We report rotation periods for 310 out of 540 targets
(excluding known binaries and candidate planet-host stars); our
measurements span a range of 1 to 100 days. The photometric magnetic
activity levels of these stars were computed, and for 61.5% of the
dwarfs, this level is similar to the range, from minimum to maximum, of
the solar magnetic activity. We demonstrate that hot dwarfs, cool
dwarfs, and subgiants have very different rotation-age relationships,
highlighting the importance of separating out distinct populations when
interpreting stellar rotation periods. Our sample of cool dwarf stars
with age and metallicity data of the highest quality is consistent with
gyrochronology relations reported in the literature.
Full Table 3 is only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/572/A34
Related projects
Helio and Astero-Seismology and Exoplanets Search
The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary
Savita
Mathur