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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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Gözlemler ve gökölçümü verileri
| Takýmyýldýz: | Zurafa |
| Sað Açýklýk: | 07h52m18.37s |
| Yükselim: | +67°53'26.9" |
| Görünürdeki Parlaklýk: | 8.998 |
| özdevim Sað Açýklýk: | -10 |
| özdevim Yükselim: | -6.8 |
| B-T magnitude: | 8.995 |
| V-T magnitude: | 8.998 |
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