Computer Science
Scientific paper
Jul 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984iue..prop.1914w&link_type=abstract
IUE Proposal ID #RSGFW
Computer Science
Scientific paper
We propose to obtain 5 deep LWP-HI exposures of the MgII resonance lines of FK Com to investigate the variable asymmetries of these lines. Existing data hints at line profile changes that repeat on the photometric period, which we interpret as evidence for streaming from the secondary to the G giant primary at velocities of ~400 km s^-1. If the existence of this streaming is confirmed, then measurements of the velocity and phasing of the streaming may confirm the binary model for FK Com, and give important insights into the atmospheric structure of a G giant which is gaining mass at some 10^-7 M(sun) yr^-1. We also propose to obtain absolute velocities for the MgII absorption components, which are presumably stellar, and study the motions of density inhomogeneities in the atmosphere (by a Doppler imaging technique). FK Com is one of the most peculiar stars in the sky; these observations can confirm the binary nature of the system and its interpretation as a short lived phase in the evolution of an Algol system. We request 5 US1 and 2 1/2 US2 shifts, 1 1/2 shifts per day for 5 consecutive days.
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