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Mg II h + k Flux—Rotational Period Correlation for G-type Stars
Bertone, Emanuele; Olmedo, Manuel; Chávez, Miguel +1 more
We present an analysis of the correlation between the mid-UV Mg II h and k emission lines and measured rotational periods of G-type stars. Based on IUE and HST high resolution spectra of a sample of 36 stars, we derive an exponential function that best represents the correlation. We found that the variation of the Mg II h + k fluxes is about a fac…
Interstellar Dust Models Towards Some IUE Stars
Gupta, R.; Katyal, N.; Vaidya, D. B.
We study the extinction properties of the composite dust grains, consisting of host silicate spheroids and graphite as inclusions, using discrete dipole approximation (DDA). We calculate the extinction cross sections of the composite grains in the ultraviolet spectral region, 1200Å-3200Åand study the variation in extinction as a function of the vo…