Components in the interstellar medium toward epsilon persei and delta persei

Journal Article · Tue Jun 01 04:00:00 EDT 1982 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/159971· OSTI ID:6865045

Martin, E R; York, D G

We analyze the lines of sight toward epsilon Persei and delta Persei with a procedure that gives velocity components for various interstellar ions. The column densities found for ions expected to be relatively undepleted are used to estimate the column density of neutral hydrogen in each component. The velocities found correspond well with those determined from previous optical studies when the optical components can be resolved. Whenever possible we calculate electron density, calcium and titanium depletion, molecular hydrogen excitation temperature, and hydrogen volume density for each component. Toward each star there is one dominent component with high column density, low LSR velocity, a large depletion in Ca and Ti, and low H/sub 2/ excitation temperature. The H/sub 2/ results also indicate that the dominant component has a high hydrogen volume density. The components at higher velocities are characterized by lower column densities and less Ca and Ti depletion, relative to the dominant component. There is also evidence that there is one component toward each star which contains mostly ionized gas. While the electron densities found seem consistent with previous results, questions are raised concerning the formation rate of H/sub 2/ and the abundance variations of certain species from cloud to cloud.

• Research Organization: Princeton University Observatory
• OSTI ID: 6865045
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 257:1; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
CALCIUM IONS
CHARGED PARTICLES
COSMIC GASES
ELECTRON DENSITY
ELEMENTS
FLUIDS
GASES
HYDROGEN
INTERSTELLAR SPACE
IONS
NONMETALS
QUANTITY RATIO
RADIAL VELOCITY
SPACE
SPECTRA
TITANIUM IONS
ULTRAVIOLET SPECTRA
VELOCITY