Depletion of calcium in the Rho Ophiuchi cloud
Data on the interstellar Ca II H and K lines toward HD 147889, a star deeply embedded in the rho Ophiuchi dark cloud, were obtained at the Mauna Kea Observatory of the University of Hawaii, using a multi-anode microchannel array (MAMA) detector. An upper limit on the Ca II column density of 1.7 x 10/sup 11/ cm/sup -2/ was derived, which, together with ionization considerations (published elsewhere) and an estimated lower limit on the total hydrogen column density, implies that the calcium-to-hydrogen ratio in this line of sight is 7.95 x 10/sup -6/ or less, relative to the solar value. The logarithmic depletion is < or =-5.10, the largest yet measured, and implies that gas-grain interaction in this region has proceeded to a much greater degree than is typical of diffuse clouds.
- Research Organization:
- Laboratory for Atmospheric and Space Physics, Department for Astrophysics, University of Colorado
- OSTI ID:
- 6302611
- Journal Information:
- Astrophys. J., Lett. Ed.; (United States), Vol. 265:2
- Country of Publication:
- United States
- Language:
- English
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