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HD 52904


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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.

Luminosity Class III Stars with Excess Far-Infrared Emission
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1995ApJ...446L..79Z&db_key=AST

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Сазвежђа:Прамац
Ректацензија:06h59m07.31s
Deклинација:-60°50'31.3"
Apparent магнитуда:6.97
Даљина:408.163 parsecs
Proper motion RA:-0.5
Proper motion Dec:-6.2
B-T magnitude:8.968
V-T magnitude:7.135

Каталог и designations:
Proper имена   (Edit)
HD 1989HD 52904
TYCHO-2 2000TYC 8908-1486-1
USNO-A2.0USNO-A2 0225-03324902
HIPHIP 33622

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