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HD 24124


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Extent of Excess Far-Infrared Emission around Luminosity Class III Stars
With the Infrared Space Observatory, we conducted 3×3 pixelimaging photometry of 12 luminosity class III stars, which werepreviously presumed to have dust particles around them, at far-infraredwavelengths (60 and 90 μm). Eleven out of 12 targets show a peak ofexcess (above photosphere) far-infrared emission at the location of thestar, implying that the dust particles are truly associated with stars.To estimate the size of the excess emission source, the flux ratio ofcenter to boundary pixels of the 3×3 array was examined. Theradius of the dust emission is found to be ~3000 to ~10,000 AU for athin shell distribution and ~5000 to ~25,000 AU for a uniformdistribution. We consider three models for the origin of the dust:disintegration of comets, sporadic dust ejection from the star, andemission from nearby interstellar cirrus. The data seem to rule out thefirst model (as far as the ``Kuiper belt-like'' particles are assumed tobe large blackbody grains) but do not enable us to choose between theother two models.

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

DDO Photometry of G-Stars and K-Stars
Abstract image available at:http://adsabs.harvard.edu/abs/1982PASP...94..347P

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观测天体数据

星座:網罟座
右阿森松:03h48m03.30s
赤纬:-53°45'08.4"
视星:8.43
距离:505.051 天文距离
右阿森松适当运动:16.1
赤纬适当运动:2.2
B-T magnitude:10.106
V-T magnitude:8.569

目录:
适当名称   (Edit)
HD 1989HD 24124
TYCHO-2 2000TYC 8500-733-1
USNO-A2.0USNO-A2 0300-01126875
HIPHIP 17755

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