No abstract

We report on spectral observations of the night sky in the band around 900 A where the emission line in the Sciama model of radiatively decaying massive neutrinos would be present. The data were obtained with a high resolution, high sensitivity spectrometer flown on the Spanish MINISAT satellite. The observed emission is far less intense than that expected in the Sciama model. Subject headings: cosmology: diffuse radiation -elementary particlesultraviolet: general 1 Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration

We present the far ultraviolet spectrum of α Virginis taken with EURD spectrograph on-board MINISAT-01. The spectral range covered is from ∼ 900 to 1080Å with 5Å spectral resolution. We have fitted Kurucz models to IUE spectra of α Vir and compared the extension of the model to our wavelengths with EURD data. This comparison shows that EURD fluxes are consistent with the prediction of the model within ∼ 20 − 30 %, depending on the reddening assumed. EURD fluxes are consistent with Voyager observations but are ∼60% higher than most previous rocket observations of α Vir.

Spectra of B stars in the wavelength range of 911-1100Å have been obtained with the EURD spectrograph onboard the Spanish satellite MINISAT-01 with ∼ 5Å spectral resolution. IUE spectra of the same stars have been used to normalize Kurucz models to the distance, reddening and spectral type of the corresponding star. The comparison of 8 main-sequence stars studied in detail (α Vir, ǫ Tau, λ Tau, τ Tau, α Leo, ζ Lib, θ Oph, and σ Sgr) shows agreement with Kurucz models, but observed fluxes are 10-40% higher than the models in most cases. The difference in flux between observations and models is higher in the wavelength range between Lyman α and Lyman β. We suggest that Kurucz models underestimate the FUV flux of main-sequence B stars between these 1 Based on the development and utilization of the Espectrógrafo Ultravioleta de Radiación Difusa, a collaboration

No abstract