NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
The chromospheres of late-type stars. II - An atlas of chromospheric lines for selected early-K starsHigh-resolution spectra of the chromospheric Na I D lines, Ca I 4227, Mg I 4571, 5167, and 5172, the Ca II H and K resonance and IR 8542.144 and 8662.170 lines, and H-alpha and H-beta, all observed simultaneously at the AAT, are presented. These data are presented as the observational basis for the self-consistent, semiempirical modeling of the outer photospheres and chromospheres of the target stars. Stellar activity is found in the low-chromosphere lines as core-filling and, in some stars, as line-broadening. Integrated fluxes are derived from the difference spectra, formed by subtracting quiet from active spectra, in the Ca II H and K resonance and IR 8542 and 8662 lines and in H-alpha, which are presented as chromospheric activity indicators. All the activity indices exhibit strong correlations, with the exception of the equivalent widths of H-alpha and H-beta, which are found to be relatively poor activity discriminators.
Document ID
19930051729
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Thatcher, John D.
(Sydney Univ. Australia)
Robinson, Richard D.
(Computer Sciences Corp.; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 16, 2013
Publication Date
May 1, 1993
Publication Information
Publication: Royal Astronomical Society, Monthly Notices
Volume: 262
Issue: 1
ISSN: 0035-8711
Subject Category
Astrophysics
Accession Number
93A35726
Distribution Limits
Public
Copyright
Other

Available Downloads

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