NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The RS CVn Binary HD 155555: A Comparative Study of the Atmospheres for the Two Component StarsWe present GHRS/HST observations of the RS CVn binary system HD 155555. Several key UV emission lines (Fe XXI, Si IV, O V, C IV) have been analyzed to provide information about the heating rate throughout the atmosphere from the chromosphere to the corona. We show that both the G and K components reveal features of a chromosphere, transition region and corona. The emission measure distribution as a function of temperature for both components is derived and compared with the RS Cvn system, HR 1099, and the Sun. The transition region and coronal lines of both stars show nonthermal broadenings of approx. 20-30 km/s. Possible physical implications for coronal heating mechanisms are discussed.
Document ID
19980018595
Acquisition Source
Goddard Space Flight Center
Document Type
Contractor Report (CR)
Authors
Airapetian, V. S.
(Computer Sciences Corp. Greenbelt, MD United States)
Dempsey, R. C.
(Computer Sciences Corp. Baltimore, MD United States)
Date Acquired
September 6, 2013
Publication Date
January 1, 1997
Subject Category
Astronomy
Report/Patent Number
NAS 1.26:207188
NASA/CR-97-207188
Funding Number(s)
CONTRACT_GRANT: NASA Order S-57788-Z
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available