The Variability of Sunlike Stars on Decadal Timescales
Abstract
The authors have successfully combined photometric observations of about 30 sun-like stars from Mount Wilson, Lowell, and Fairborn Observatories to extend their joint time series from 12 to 17 years. The stability of the statistical relationships between chromospheric and brightness variability, derived previously, suggests that the full range of variation on the decadal time-scale has probably now been observed for most of their program stars. Young, active stars become fainter as their chromospheric Ca II HK emission increases, while older, less active stars, such as the Sun, become brighter as their HK emission increases. The Sun's photometric variation still appears to be somewhat small in amplitude at present, compared to other stars in this sample with similar mean chromospheric activity.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2004
- Accession Number
- ADA434549
Entities
People
- G .w. Henry
- G. W. Lockwood
- Richard R. Radick
- S. L. Baliunas
Organizations
- Air Force Research Laboratory