Interstellar titanium

Journal Article · Sun Jan 01 04:00:00 EST 1978 · Astrophys. J., Suppl. Ser.; (United States)

DOI:https://doi.org/10.1086/190493· OSTI ID:5035255

Stokes, G M

High-dispersion photoelectric scans of the interstellar lambda3384 line of Ti ii have been obtained for 68 stars. Column densities of Ti ii have been derived for the various individual kinematic components in the scans. These column densities, and those integrated over all components in the respective directions, have been compared to corresponding results for Na i, Ca ii, K i, H i, and H/sub 2/. The column densities of titanium and hydrogen show directly that the depletion of titanium from the interstellar gas is large and variable. The abundance of titanium in the gas also varies strongly relative to that of sodium, potassium, and the grains responsible for reddening. In contrast, the ratio of the column density of titanium to that of calcium is relatively constant at about 4 times its solar value. Lower depletions are found in four out of five cases of absorption in the intercloud medium and toward each of two stars at high galactic z-distances. The column densities of Ca ii and Ti ii have been used to estimate the electron densities in individual kinematic components. These electron densities are uncorrelated with the depletions of titanium, indicating that depletion is not a simple or unique function of local density.

• Research Organization: Yerkes Observatory, University of Chicago
• OSTI ID: 5035255
• Journal Information: Astrophys. J., Suppl. Ser.; (United States), Journal Name: Astrophys. J., Suppl. Ser.; (United States) Vol. 36:1; ISSN APJSA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CHEMICAL COMPOSITION
CHEMISTRY
COSMIC GASES
COSMIC RADIO SOURCES
COSMOCHEMISTRY
ELECTRON DENSITY
ELEMENTS
ENERGY SPECTRA
FLUIDS
FUNCTIONS
GASES
H1 REGIONS
H2 REGIONS
INTERSTELLAR GRAINS
INTERSTELLAR SPACE
METALS
PARTICLES
SPACE
SPECTRA
SPECTRAL DENSITY
SPECTRAL FUNCTIONS
TITANIUM
TRANSITION ELEMENTS