A Survey of Local Interstellar Hydrogen from OAO-2 Observations of Lyman Alpha Absorption. | Zendy

Blair D. Savage | Zendy; E. B. Jenkins | Zendy

AI Assistant Blog Pricing

Home ZAIA Blog

Open Access

A Survey of Local Interstellar Hydrogen from OAO-2 Observations of Lyman Alpha Absorption.

Author(s) -

Blair D. Savage,

E. B. Jenkins

Publication year - 1972

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/151369

Subject(s) - physics , stars , astrophysics , spectral line , interstellar medium , astronomy , absorption (acoustics) , spectral resolution , hydrogen , abundance of the chemical elements , galaxy , optics , quantum mechanics

A far UV spectrometer aboard OAO-2 observed the wavelength region near 1216 A for 69 stars of spectral type B2 or earlier. From the strength of the observed interstellar L-alpha absorption, column densities of atomic hydrogen were derived over distances averaging 300 pc away from the sun. Measurements of the equivalent widths of this absorption were found to be inappropriate for deducing column densities because of the blending of nearby strong stellar lines by the 12 A wide instrumental profile of the OAO. Instead, the OAO data were compared with synthetic UV spectra, originally derived from earlier higher-resolution rocket observations, which were computer processed to simulate the effects of absorption by different amounts of hydrogen followed by the instrumental blending.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.

Having issues? You can contact us here

Accelerating Research