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Full-Text Articles in Physical Sciences and Mathematics
Early Spectra Of The Supernova 1987f, Gary Wegner, Steven R. Swanson
Early Spectra Of The Supernova 1987f, Gary Wegner, Steven R. Swanson
Dartmouth Scholarship
Spectroscopy is presented of the peculiar Type n supernova 1987F, sometimes called the 'Type I Seyfert imposter'. This supernova differed from others of Type n in the slow evolution in its light curve and the strengths and profiles of the spectral lines. The time covered is 1987 April 2 to June 8, when the spectrum of the supernova evolved from a simple nearly featureless blue continuum with superimposed narrow emission lines of H I, He I, [N II], [0 III], and [S II] to a complicated combination of broad and narrow emission components in H I and He I plus …
The Orbital Period Of Bk Lyncis (Pg 0917 + 342), F. A. Ringwald, J. R. Thorstensen, R. K. Honeycutt, J. W. Robertson
The Orbital Period Of Bk Lyncis (Pg 0917 + 342), F. A. Ringwald, J. R. Thorstensen, R. K. Honeycutt, J. W. Robertson
Dartmouth Scholarship
Long-term light curves of the cataclysmic variable BK Lyn = PG 0917 + 342 from the Indiana Automated CCD photometric telescope (‘RoboScope’) and the Harvard College Observatory plate archive reveal no dwarf nova outbursts. Two radial velocity studies show its orbital period to be 107.97 ;1 0.07 min, confirming that it does have an orbital period shorter than the period gap for cataclysmic variables. Whether this is the first nova-like variable below the period gap or a dwarf nova with rare outbursts resembling WZ Sge is still unclear, however.