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HD 103536


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Classification and properties of UV extinction curves
The catalog of Savage et al. (\cite{ref27}) reporting colour excesses of1415 stars from ANS photometry offers the opportunity to deeplyinvestigate the characteristics of UV extinction curves which differfrom the standard extinction of the diffuse interstellar medium. To thisaim we have selected a sample of 252 curves, which have been comparedwith the relations derived by Cardelli et al. (\cite{ref4}; CCM in thefollowing) for a variety of R_V values in the range 2.4-5 and have beenclassified as normal if they fit at least one of the CCM curves oranomalous otherwise. We find that normal curves with small R_V are justas numerous as those with large R_V. The anomalous objects are arrangedinto two groups according to the strength of the bump at 0.217 mu . Fora given value of c_2 this increases along the sequence: type Aanomalous, normals and type B anomalous, suggesting that this sequenceshould correspond to an increase of the amount of small grains along thesightline. Considerations concerning the environmental characteristicsindicate that the anomalous behaviour is not necessarily tied to theexistence of dense gas clouds along the line of sight.

Dust Metamorphosis in the Galaxy
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观测天体数据

星座:三角座
右阿森松:11h54m53.02s
赤纬:-81°00'25.1"
视星:9.025
右阿森松适当运动:-16.5
赤纬适当运动:1.8
B-T magnitude:9.152
V-T magnitude:9.036

目录:
适当名称   (Edit)
HD 1989HD 103536
TYCHO-2 2000TYC 9423-684-1
USNO-A2.0USNO-A2 0075-02970506
HIPHIP 58095

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