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HD 63158


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The distance to the Chain A high-velocity cloud complex.
We present high-resolution (R~5km/s) NaI and CaII interstellarabsorption line spectra observed toward five B stars in the line ofsight to the high-velocity cloud complex Chain A. We have failed todetect the presence of any high-velocity (V<-100km/s) interstellarabsorption toward these stars. This null detection enables us to place anew lower limit on the distance to the Chain A complex ofz>=837+/-200pc, assuming normal gas-phase abundances of NaI and CaII.If this distance determination is typical for other high-velocityclouds, it poses problems for theories that currently argue these cloudsinteract with the galactic disk.

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观测天体数据

星座:鹿豹座
右阿森松:07h52m18.37s
赤纬:+67°53'26.9"
视星:8.998
右阿森松适当运动:-10
赤纬适当运动:-6.8
B-T magnitude:8.995
V-T magnitude:8.998

目录:
适当名称   (Edit)
HD 1989HD 63158
TYCHO-2 2000TYC 4361-1260-1
USNO-A2.0USNO-A2 1575-02785428
HIPHIP 38426

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