Interstellar absorption along the line of sight to Sigma Scorpii using Copernicus observations

Journal Article · Tue May 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/168747· OSTI ID:6690219

Allen, M M; Snow, T P; Jenkins, E B ^[1]

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1. Colorado Univ., Boulder (USA) Princeton Univ. Observatory, NJ (USA)

From Copernicus observations of Sigma Sco, 57 individual lines of 11 elements plus the molecular species H2 and CO were identified. By using a profile-fitting technique, rather than curves of growth, it was possible to obtain column densities and Doppler b values for up to four separate components along this line of sight. Electron density in the major H I component was derived from the photoionization equilibrium of sulfur, obtaining, n(e) of about 0.3/cu cm. The neutral hydrogen density in the same component was also derived using fine-structure excitation of O I. An H II component is also present in which the electron density was n(e) about 20/cu cm. As a by-product of this analysis, previously undetermined oscillator strengths for two Mn II lines were obtained: for 1162.-017 A, f about 0.023 and for 1164.211 A, f about 0.0086. 58 refs.

• OSTI ID: 6690219
• Journal Information: Astrophysical Journal; (USA), Vol. 355; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
INTERSTELLAR SPACE
CHEMICAL COMPOSITION
ABSORPTION
CARBON MONOXIDE
ELECTRON DENSITY
ELEMENT ABUNDANCE
H1 REGIONS
H2 REGIONS
HYDROGEN
MANGANESE
MOLECULES
SPECTROSCOPY
STELLAR RADIATION
SULFUR
ABUNDANCE
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
COSMIC RADIO SOURCES
ELEMENTS
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SPACE
TRANSITION ELEMENTS
640105* - Astrophysics & Cosmology- Galaxies