English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

$\theta$ Cygni is an F3 spectral-type main-sequence star with visualmagnitude V=4.48. This star was the brightest star observed by the originalKepler spacecraft mission. Short-cadence (58.8 s) photometric data using acustom aperture were obtained during Quarter 6 (June-September 2010) andsubsequently in Quarters 8 and 12-17. We present analyses of the solar-likeoscillations based on Q6 and Q8 data, identifying angular degree $l$ = 0, 1,and 2 oscillations in the range 1000-2700 microHz, with a large frequencyseparation of 83.9 plus/minus 0.4 microHz, and frequency with maximum amplitude1829 plus/minus 54 microHz. We also present analyses of new ground-basedspectroscopic observations, which, when combined with angular diametermeasurements from interferometry and Hipparcos parallax, give T_eff = 6697plus/minus 78 K, radius 1.49 plus/minus 0.03 solar radii, [Fe/H] = -0.02plus/minus 0.06 dex, and log g = 4.23 plus/minus 0.03. We calculate stellarmodels matching the constraints using several methods, including using the YaleRotating Evolution Code and the Asteroseismic Modeling Portal. The best-fitmodels have masses 1.35-1.39 solar masses and ages 1.0-1.6 Gyr. theta Cyg'sT_eff and log g place it cooler than the red edge of the gamma Doradusinstability region established from pre-Kepler ground-based observations, butjust at the red edge derived from pulsation modeling. The pulsation models showgamma Dor gravity-mode pulsations driven by the convective-blocking mechanism,with frequencies of 1 to 3 cycles/day (11 to 33 microHz). However, gravitymodes were not detected in the Kepler data, one signal at 1.776 cycles/day(20.56 microHz) may be attributable to a faint, possibly background, binary.Asteroseismic studies of theta Cyg and other A-F stars observed by Kepler andCoRoT, will help to improve stellar model physics and to test pulsation drivingmechanisms.

astrophysical journal/the astrophysical journal

Detection of Solar-Like Oscillations, Observational Constraints, and  Stellar Models for $\theta$ Cyg, the Brightest Star Observed by the {\it  Kepler} Mission