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HD 159605


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Giants with infrared excess.
We have correlated optical and infrared catalogs in order to extract alarge sample of luminosity class III stars with known infrared fluxdensities. For a non-negligible fraction of G and K giants, afar-infrared excess emission was found, starting beyond 25μm. Anexplanation in terms of present-day mass loss thus becomes unlikely,since the dust should then be warmer and the excess emission less far inthe infrared. We believe that the far-infrared excesses of theseobjects, most likely first-ascent giants, are related to the Vegaphenomenon. The dusty disks around these stars, gradually cooled downduring their main-sequence phase, could be reheated once the star leavesthe main sequence and enters the luminous post-main-sequence phase. Thefairly large sample we constructed enables us to derive an estimationfor the occurrence of excesses. This fraction of G or K giants withfar-infrared excess appears to be distinctly smaller than amongmain-sequence stars. Since the higher radiation field of giants couldlead to a larger evaporation rate of the circumstellar debris, this factdoes not conflict with our hypothesis.

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Observation and Astrometry data

Constellation:ふうちょう座
Right ascension:17h46m27.82s
Declination:-78°16'35.3"
Apparent magnitude:8.269
Distance:303.951 parsecs
Proper motion RA:22.6
Proper motion Dec:-26.8
B-T magnitude:9.708
V-T magnitude:8.388

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 159605
TYCHO-2 2000TYC 9448-2365-1
USNO-A2.0USNO-A2 0075-05908201
HIPHIP 86973

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