NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The photospheric magnetic field of the dM3.5e flare star AD LeonisA high-resolution infrared spectrum of the dM3.5e flare star AD Leo, obtained with the Kitt Peak 4 m Fourier Transform Spectrometer, clearly shows the presence of strong magnetic fields. Five absorption lines in the 4400-4600 per cm region have been modeled, and it is inferred that 73 percent + or - 6 percent of the surface of AD Leo is covered by active regions outside of dark spots containing a mean field strength of 3800 + or - 260 G. If these active regions are brighter than the quiet photosphere, the surface filling factor will be somewhat smaller. Since simultaneous H-alpha observations exhibited no evidence of flares, the observations probably represent the quiescent magnetic flux level. The inferred field strength is consistent with equipartition of magnetic and thermal pressures in the photosphere and is similar to values derived using the scaling laws of Golub. The large observed filling factor is consistent with efficient dynamo generation of magnetic flux in this rapidly rotating star.
Document ID
19860035594
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
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 12, 2013
Publication Date
December 1, 1985
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters to the Editor
Volume: 299
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
86A20332
Funding Number(s)
CONTRACT_GRANT: NGL-06-003-057
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available