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HD 48674


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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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Observation and Astrometry data

Constellation:とも座
Right ascension:06h42m34.42s
Declination:-41°48'55.2"
Apparent magnitude:7.442
Distance:186.916 parsecs
Proper motion RA:-2.9
Proper motion Dec:-14.1
B-T magnitude:8.876
V-T magnitude:7.561

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 48674
TYCHO-2 2000TYC 7635-2242-1
USNO-A2.0USNO-A2 0450-02897993
HIPHIP 32126

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