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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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Observation and Astrometry data

Constellation:きょしちょう座
Right ascension:00h24m46.37s
Declination:-58°00'51.3"
Apparent magnitude:9.384
Proper motion RA:50.8
Proper motion Dec:4.6
B-T magnitude:9.776
V-T magnitude:9.417

Catalogs and designations:
Proper Names   (Edit)
HD 1989HD 2089
TYCHO-2 2000TYC 8471-473-1
USNO-A2.0USNO-A2 0300-00118658
HIPHIP 1959

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