Chromospheric MG II H and K emissions free of interstellar contamination - Velocity structure in late-type dwarfs and giants

Details Chromospheric MG II H and K emissions free of interstellar contamination - Velocity structure in late-type dwarfs and giants Chromospheric MG II H and K emissions free of interstellar contamination - Velocity structure in late-type dwarfs and giants

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..233v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 233-246. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

37

Chromosphere, Dwarf Stars, Giant Stars, Interstellar Matter, Late Stars, Stellar Atmospheres, Cool Stars, Doppler Effect, Hertzsprung-Russell Diagram, High Resolution, Iue, Red Shift

Scientific paper

The authors have used high resolution IUE spectra from their own studies and from the archive to examine the Mg II h and k chromospheric emission cores of a sample of late-type dwarfs and giants. Sharp photospheric absorptions were used to provide a velocity rest-frame with respect to each stellar photosphere with the IUE-limited precision of ±4 km s-1. The knowledge of the kinematics of the local interstellar medium (LISM) could then be used to identify cases where either the cores or the wings, or in best circumstances both features of the chromospheric lines were uncontaminated by LISM absorption. The authors derive, using only LISM-free emission wings, accurate Wilson-Bappu relations for both the h and k line, characterized by a slope higher than in previous determinations.

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