Back to Search
Start Over
THE ACTIVITY AND VARIABILITY OF THE SUN AND SUN-LIKE STARS. II. CONTEMPORANEOUS PHOTOMETRY AND SPECTROSCOPY OF BRIGHT SOLAR ANALOGS
- Source :
- The Astronomical Journal. 138:312-322
- Publication Year :
- 2009
- Publisher :
- American Astronomical Society, 2009.
-
Abstract
- We present 14 years of contemporaneous photometric and spectroscopic observations of 28 solar analog stars, taken with the Tennessee State University Automatic Photometric Telescopes at Fairborn Observatory and the Solar-Stellar Spectrograph at Lowell Observatory. These are the best observed and most nearly Sun-like of the targets in our magnitude-limited (V ≤ 7.5) sample. The correlations between luminosity and activity reveal the expected inverse activity-brightness correlations for active stars. Strong direct correlations between activity and brightness are not prevalent for the less active solar age stars, but are precision limited. The Sun does not appear to have unusually low photometric variability when compared with the most Sun-like inactive solar analogs. We present evidence that the activity index R'HK is not a good discriminant of Maunder Minimum candidate stars. On the basis of a star that appears to have transitioned from a low-variability state to a cycling state, we investigate the regime in which stars might switch from faculae-dominated to spot-dominated variations.
- Subjects :
- Physics
Brightness
Solar analog
K-type main-sequence star
Astronomy
Astronomy and Astrophysics
Astrophysics::Cosmology and Extragalactic Astrophysics
Astrophysics
Photometry (optics)
Stars
Space and Planetary Science
Observatory
Physics::Space Physics
Astrophysics::Solar and Stellar Astrophysics
Astrophysics::Earth and Planetary Astrophysics
Spectroscopy
Spectrograph
Astrophysics::Galaxy Astrophysics
Subjects
Details
- ISSN :
- 15383881 and 00046256
- Volume :
- 138
- Database :
- OpenAIRE
- Journal :
- The Astronomical Journal
- Accession number :
- edsair.doi...........1f8329aafb9a200a4e1ebf477b2791b8