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HD 48978


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The First Ultraviolet and Optical Spectropolarimetry of the B[e] Star HD 50138
We report the first ultraviolet spectropolarimetry of the B[e] star HD50138, obtained with the Wisconsin Ultraviolet Photo-PolarimeterExperiment aboard the Astro-2 Space Shuttle mission in 1995 March. Thedata cover the spectral range 1500-3200 Å. Spectropolarimetryobtained contemporaneously in the range of 3800-10,000 Å in thevisual-to-near-IR region are presented as well. The presence ofintrinsic polarization is detected from the UV to the near-IR. Strongevidence of a thin gaseous disk around the star is found. An almost flatwavelength dependence of the intrinsic polarization in the opticalspectral region indicates that electron scattering, rather than dustscattering, is the dominant polarizing mechanism, although a smallcontribution due to dust scattering cannot be completely ruled out. Asmall inclination of the disk away from edge-on with respect to the lineof sight is suggested. Comparison with similar polarimetric observationsobtained for different objects that have the same circumstellar geometryshows that the envelope of HD 50138 probably has a rather large densitycontrast between the equatorial and polar regions that does not producea position angle flip like that observed in other objects, notably HD45677.

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观测天体数据

星座:麒麟座
右阿森松:06h45m53.75s
赤纬:-06°53'46.7"
视星:7.895
距离:284.9 天文距离
右阿森松适当运动:-4.3
赤纬适当运动:-4.2
B-T magnitude:8.011
V-T magnitude:7.905

目录:
适当名称   (Edit)
HD 1989HD 48978
TYCHO-2 2000TYC 4812-2561-1
USNO-A2.0USNO-A2 0825-03133654
HIPHIP 32403

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