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HD 148833


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A high-resolution optical and radio study of Milky Way halo gas
Optical interstellar absorption lines of Ti II and Ca II and the 21 cmemission line of H I were observed at high-resolution (6 and 1 km/s,respectively) and high detection sensitivity along 25 lines of sight inthe Galactic halo. The sample includes 16 distant halo stars matchedwith one or more nearly aligned foreground stars as well as local starsalong five extragalactic sight lines. The data show substantialinterstellar material, at both low and intermediate velocities, between250 and 1000 pc beyond the Galactic plane. As much as one-third of thetotal gas observed in Ca II absorption may be beyond 1 kpc, and thegaseous Ti II may lie in an even thicker layer. The directly determinedgaseous Ti abundance above the Galactic plane exceeds that in the disk,on the average, by a factor of 4 to 6 and, for individual cloudcomponents, is further enhanced at higher LSR velocity. Thirty threediscrete high-latitude clouds are detected in Ca II absorption, and 17discrete clouds, including three high-velocity clouds, are identified inH I emission. The kinematics of the high-latitude gas observed in Ti IIand Ca II absorption is characterized by significant peculiar velocitieswith respect to a model corotating halo.

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观测天体数据

星座:蛇夫座
右阿森松:16h31m05.50s
赤纬:-07°32'27.3"
视星:7.888
距离:122.699 天文距离
右阿森松适当运动:-10.6
赤纬适当运动:-14.8
B-T magnitude:8.043
V-T magnitude:7.901

目录:
适当名称   (Edit)
HD 1989HD 148833
TYCHO-2 2000TYC 5627-628-1
USNO-A2.0USNO-A2 0750-09794155
HIPHIP 80891

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