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HD 58776


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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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Datos observacionales y astrométricos

Constelación:Pez Volador
Ascensión Recta:07h19m08.32s
Declinación:-75°14'11.1"
Magnitud Aparente:8.33
Distancia:375.94 parsecs
Movimiento Propio en Ascensión Recta:-30.2
Movimiento Propio en Declinación:37.8
B-T magnitude:9.882
V-T magnitude:8.459

Catálogos y designaciones:
Nombres Propios
HD 1989HD 58776
TYCHO-2 2000TYC 9380-28-1
USNO-A2.0USNO-A2 0075-01361972
HIPHIP 35448

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