Ultraviolet observations of cool stars. V. The local density of interstellar matter
Journal Article
·
· Astrophys. J., Lett.; (United States)
A high-resolution Copernicus observation of the chromospheric L..cap alpha.. emission line of the nearby (3.3 pc) K dwarf epsilon Eri sets limits on the velocity, the velocity dispersion, and the density n/sub H/ of atomic hydrogen in the local interstellar medium. Analysis shows that the interstellar L..cap alpha.. absorption is on the flat portion of the curve of growth. An upper limit of n/sub H/=0.12 cm/sup -3/od n/sub H/ is 0.08 +- 0.04 cm/sup -3/ if the velocity dispersion parameter b = 9 km s/sup -1/, corresponding to a temperature of 5000 K. Also, the interstellar deuterium L..cap alpha.. line may be present in the spectrum. (AIP)
- Research Organization:
- Physics Department, The Johns Hopkins University
- OSTI ID:
- 7285759
- Journal Information:
- Astrophys. J., Lett.; (United States), Journal Name: Astrophys. J., Lett.; (United States) Vol. 204:2; ISSN AJLEA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640102 -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
BRIGHTNESS
CRYOGENIC FLUIDS
DEUTERIUM
DWARF STARS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
HYDROGEN
HYDROGEN ISOTOPES
INTERSTELLAR SPACE
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
SOLAR RADIATION
SPACE
SPECTRA
STABLE ISOTOPES
STARS
ULTRAVIOLET SPECTRA
VELOCITY
Radio & X-Ray Sources
640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
BRIGHTNESS
CRYOGENIC FLUIDS
DEUTERIUM
DWARF STARS
ELECTROMAGNETIC RADIATION
ELEMENTS
FLUIDS
HYDROGEN
HYDROGEN ISOTOPES
INTERSTELLAR SPACE
ISOTOPES
LIGHT NUCLEI
NONMETALS
NUCLEI
ODD-ODD NUCLEI
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
RADIOWAVE RADIATION
SOLAR RADIATION
SPACE
SPECTRA
STABLE ISOTOPES
STARS
ULTRAVIOLET SPECTRA
VELOCITY