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HD 94010


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The DDO IVC Distance Project: Survey Description and the Distance to G139.6+47.6
We present a detailed analysis of the distance determination for oneintermediate-velocity cloud (IVC, G139.6+47.6) from the ongoing DDO IVCDistance Project. Stars along the line of sight to G139.6+47.6 areexamined for the presence of sodium absorption attributable to thecloud, and the distance bracket is established by astrometric andspectroscopic parallax measurements of demonstrated foreground andbackground stars. We detail our strategy regarding target selection,observational setup, and analysis of the data, including a discussion ofwavelength calibration and sky subtraction uncertainties. We find adistance estimate of 129+/-10 pc for the lower limit and257+211-33 pc for the upper limit. Given the highnumber of stars showing absorption due to this IVC, we also discuss thesmall-scale covering factor of the cloud and the likely significance ofnondetections for subsequent observations of this and other similarIVCs. Distance measurements of the remaining targets in the DDO IVCproject will be detailed in a companion paper.

A universal formula for determining the stellar mass loss rate
The quiet outflow of stellar mass, which occurs as stellar wind, isconsidered. Mass loss rates (M) for 400 stars were used to derive aformula expressing M as a function of four stellar parameters: L,T(eff), Y, and Z.

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观测天体数据

星座:大熊座
右阿森松:10h52m32.33s
赤纬:+64°46'30.7"
视星:8.567
距离:164.745 天文距离
右阿森松适当运动:11.6
赤纬适当运动:8
B-T magnitude:8.905
V-T magnitude:8.595

目录:
适当名称   (Edit)
HD 1989HD 94010
TYCHO-2 2000TYC 4148-1132-1
USNO-A2.0USNO-A2 1500-05364703
HIPHIP 53158

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