Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1867p&link_type=abstract
IUE Proposal ID #FEGMP
Computer Science
Scientific paper
I propose to study the stars XX Ophiuchi and BD+14 3887. Both stars show prominent line emission spectra in the optical region. Fe II lines are so conspicuous and abundant in XX Ophiuchi that the star was called an "iron stair" by Merrill. The optical spectrum of BD+14 3887 is similar but its He I emission lines are very conspicuous. XX Ophiuchi is known to have a cool companion; our optical scans indicate that BD+14 3887 may have one, too. The optical continua of both stars are very peculiar. They are quite continuous across the Balmer discontinuity. Parts of the Paschen continuum can be fitted by a Kurucz model atmosphere for a moderate B star, but then one must postulate a circumstellar optically thin continuous radiation of hydrogen with just the right emission jump at the Balmer limit to fill in the flux drop in the stellar continuum. Alternatively, both objects may be disks, perhaps similar to those we suspect in strongly interacting binaries such as the W Serpentis stars; IUE spectra should decide. No IUE spectrum exists for BD+14 3887 and I propose to obtain at least a LWR spectrum. The available IUE spectra for XX Ophiuchi are underexposed, but they suggest that satisfactory lowdispersion spectra can be obtained in both cameras. They also indicate that XX Ophiuchi may be akin to the W Serpentis stars, but at the same time raise interesting questions as to the nature of the emission lines seen in the SWP camera. I expect to get some idea about the nature of the objects, in particular whether they are interacting binaries or rather interacting with the surrounding interstellar medium (they lie in heavily obscured areas). The project can be realized in one IUE shift, but it must be a US1 shift because of the length of the exposures.
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