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Title: Depletion of calcium in the Rho Ophiuchi cloud

Abstract

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.

Authors:
; ;
Publication Date:
Research Org.:
Laboratory for Atmospheric and Space Physics, Department for Astrophysics, University of Colorado
OSTI Identifier:
6302611
Resource Type:
Journal Article
Journal Name:
Astrophys. J., Lett. Ed.; (United States)
Additional Journal Information:
Journal Volume: 265:2
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CALCIUM IONS; ABUNDANCE; INTERSTELLAR GRAINS; COSMIC GASES; INFRARED SPECTRA; RADIATION DETECTORS; CHARGED PARTICLES; FLUIDS; GASES; IONS; MEASURING INSTRUMENTS; PARTICLES; SPECTRA; 640105* - Astrophysics & Cosmology- Galaxies

Citation Formats

Snow, T P, Timothy, J G, and Seab, C G. Depletion of calcium in the Rho Ophiuchi cloud. United States: N. p., 1983. Web. doi:10.1086/183960.
Snow, T P, Timothy, J G, & Seab, C G. Depletion of calcium in the Rho Ophiuchi cloud. United States. https://doi.org/10.1086/183960
Snow, T P, Timothy, J G, and Seab, C G. 1983. "Depletion of calcium in the Rho Ophiuchi cloud". United States. https://doi.org/10.1086/183960.
@article{osti_6302611,
title = {Depletion of calcium in the Rho Ophiuchi cloud},
author = {Snow, T P and Timothy, J G and Seab, C G},
abstractNote = {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.},
doi = {10.1086/183960},
url = {https://www.osti.gov/biblio/6302611}, journal = {Astrophys. J., Lett. Ed.; (United States)},
number = ,
volume = 265:2,
place = {United States},
year = {Tue Feb 15 00:00:00 EST 1983},
month = {Tue Feb 15 00:00:00 EST 1983}
}