NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
New measurements of photospheric magnetic fields in late-type stars and emerging trendsThe magnetic fields of late-type stars are measured using the method of Saar et al. (1986). The method includes radiative transfer effects and compensation for line blending; the photospheric magnetic field parameters are derived by comparing observed and theoretical line profiles using an LTE code that includes line saturation and full Zeeman pattern. The preliminary mean active region magnetic field strengths (B) and surface area coverages for 20 stars are discussed. It is observed that there is a trend of increasing B towards the cooler dwarfs stars, and the linear correlation between B and the equipartition value of the magnetic field strength suggests that the photospheric gas pressure determines the photospheric magnetic field strengths. A tendency toward larger filling factors at larger stellar angular velocities is also detected.
Document ID
19870057247
Document Type
Reprint (Version printed in journal)
Authors
Saar, S. H. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Linsky, J. L. (Joint Institute for Laboratory Astrophysics Boulder, CO, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1986
Publication Information
Publication: Advances in Space Research
Volume: 6
Issue: 8 19
ISSN: 0273-1177
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other