Other
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.2703p&link_type=abstract
American Astronomical Society, 180th AAS Meeting, #27.03; Bulletin of the American Astronomical Society, Vol. 24, p.769
Other
2
Scientific paper
Many late-type giants and supergiants have companion stars still on the upper main sequence, but barely detectable in ground-based observations. In 1989-90 we continued our surveys of suspected hot companions with the IUE satellite. Of 32 spectrum binaries or SB1 systems observed, 25 reveal clear signatures in the UV of a B or A type component. The far-UV spectra are easily classified by temperature class with respect to IUE standard stars. Some of the more significant new results: ground UV spectrosc. HD no. V spectral type type binary? Note ---------------------------------------------------------- 25555 5.47 G0 III + A4 dB8+ var 32835/6 7.65 F5 V + A dB8.5 a 37269AB 5.40 G5 III: + A3 d:A0 var 49126 7.28 F8 IV-V + B9.5 dB8.5 a 52690 6.55 M1 Ib + A-B gB8- 58134 7.64: G5 Ib g:A1- p 63208 6.18 G2 III + A4 gB9.5 var? 167516 8.46 G5 III + A -- b 183864 7.32 G2 Ib d:A0 296.0d 218600 8.39 F2 Ib + A -- b In two systems the ground-based luminosity classifications of their primaries are seriously inconsistent with their upper main sequence companions (note a). Two spectrum binaries with supposedly A-type secondaries show no evidence of such in the UV (note b). Several other cases demonstrate a trend in our surveys: although some classifications are confirmed, we frequently find that the IUE spectral class is hotter than the ground estimate by 2 or more subclasses. This work is supported under NASA contract NAS 5-28749. SBP is a staff member of the Space Telescope Science Institute. TBA is a member of the GHRS Science Team.
Ake Thomas B.
Parsons Sidney B.
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