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Mg Emission from Hybrid-Chromosphere Stars: 1.5 Decades of Chromospheric Variability Monitoring
Ayres, Thomas R.; Bennett, Philip D.; Brown, Alexander +2 more
We present an analysis of the available long-wavelength, high-dispersion spectra of seven hybrid-chromosphere stars obtained with the International Ultraviolet Explorer between 1978 and 1993. Our investigation of the variability of the Mg II h and k resonance doublet demonstrates that the emission- line fluxes are not rotationally modulated with t…
Far-Ultraviolet Stellar Photometry: Fields Centered on rho Ophiuchi and the Galactic Center
Schmidt, Edward G.; Carruthers, George R.
Far-ultraviolet photometry is presented for 121 objects in a 20 diameter field centered on ρ Oph and for 649 objects in a field covering the Galactic center. Broadband magnitudes with effective wavelengths of 1375 Å and 1781 Å are given. The Galactic center field overlaps two fields which were discussed in an earlier paper. Eighty- eight percent o…