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Chromospheric structure of cool carbon starsA semiempirical chromospheric model is proposed for TX Psc which is a prototype for the N-type carbon stars. Observational data imply that the chromospheric temperature rise must begin at a low density, that the temperature gradient in the lower chromosphere must be steep, that partial redistribution must be employed in the Mg II calculation, and that the lower chromosphere is expanding away from the photosphere with a velocity of close to 50 km/s. The present model also shows that the microturbulent velocity is about 7 km/s at the temperature minimum region, dropping to 5 km/s in the chromosphere, and that the Lyman lines are optically thick in the chromosphere.
Document ID
19900023753
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Luttermoser, Donald G.
(Indiana Univ. Bloomington, IN, United States)
Johnson, Hollis R.
(Indiana University Bloomington, United States)
Avrett, Eugene H.
(Indiana Univ. Bloomington, IN, United States)
Loeser, Rudolf
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Date Acquired
August 14, 2013
Publication Date
October 1, 1989
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 345
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
90A10808
Funding Number(s)
CONTRACT_GRANT: NAG5-182
Distribution Limits
Public
Copyright
Other

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