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HD 2089


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Gas—Dust Shells around Some Early-Type Stars with an IR Excess (of Emission)
The results of an investigation of IR (IRAS) observations of 58O—B—A—F stars of different luminosity classes, whichare mainly members of various associations, are presented. The colorindices of these stars are determined and two-color diagrams areconstructed. The emission excesses at 12 and 25 mm (E 12 and E 25) arealso compared with the absorption A1640 of UV radiation. It is concludedthat 24 stars (of the 58 investigated) are disk systems of the Vegatype, to which Vega = N 53 also belongs. Eight known stars of the Vegatype are also given in the figures for comparison. The remaining 34stars may have gas—dust shells and/or shell—disks. The IRemission excesses of the 34 investigated stars and 11 comparison stars(eight of them are Be-Ae stars) are evidently due both to thermalemission from grains and to the emission from free—freetransitions of electrons in the gas—dust shells of these stars.

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观测天体数据

星座:杜鵑座
右阿森松:00h24m46.37s
赤纬:-58°00'51.3"
视星:9.384
右阿森松适当运动:50.8
赤纬适当运动:4.6
B-T magnitude:9.776
V-T magnitude:9.417

目录:
适当名称   (Edit)
HD 1989HD 2089
TYCHO-2 2000TYC 8471-473-1
USNO-A2.0USNO-A2 0300-00118658
HIPHIP 1959

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