Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..958v&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 15, 1987, p. 958-966. Research supported by the Fulbright Foundat
Astronomy and Astrophysics
Astronomy
134
Binary Stars, Chromosphere, Stellar Activity, Ultraviolet Astronomy, Dwarf Stars, Emission Spectra, G Stars, Iue, K Stars, Magnesium, Stellar Coronas, Stellar Rotation
Scientific paper
High-resolution IUE observations of Mg II emission lines in W Ursae Majoris were obtained. In addition, estimates of the Mg II emission for other F-type contact binaries were obtained using archival high-resolution k line spectra and some nonstandard methods; the available data were compiled for Mg II, C IV, and X-ray emission in main-sequence F, G, K, and M dwarfs in order to determine the upper levels of radiation from their chromospheric-coronal plasma. The high-resolution IUE observations of Mg II h and k emission lines in W UMa indicate that both components of the contact binary have similar chromospheres, confirming the many earlier low-resolution light curve studies. The Mg II emission (L Mg II)/Lbol) of contact binaries correlates with the Rossby number (R0), forming an extension of single G-K dwarfs.
Vilhu Osmi
Walter Frederick M.
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