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Title:
High-resolution observations of interstellar NA I and CA II absorption lines toward the Scorpius OB1 association
Authors:
Crawford, I. A.; Barlow, M. J.; Blades, J. C.
Affiliation:
AA(University College, London, England), AB(University College, London, England), AC(Space Telescope Science Institute, Baltimore, MD)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 336, Jan. 1, 1989, p. 212-230. Research supported by SERC. (ApJ Homepage)
Publication Date:
01/1989
Category:
Astronomy
Origin:
STI
NASA/STI Keywords:
ABSORPTION SPECTRA, B STARS, CALCIUM, INTERSTELLAR MATTER, O STARS, SODIUM, GALACTIC ROTATION, STELLAR SPECTRA, VELOCITY DISTRIBUTION
DOI:
10.1086/167007
Bibliographic Code:
1989ApJ...336..212C

Abstract

Observations of Na I and Ca II in absorption toward 22 stars in the Sco OB1 region, obtained at resolution R = 100,000 with a coude echelle spectrograph and 3.3-m camera on the 1.9-m telescope at Mt. Stromlo Observatory during 1986, are reported. The data are presented in extensive tables and graphs and analyzed in detail. Features discussed include (1) strong absorption at heliocentric velocities between 0 and -20 km/sec, (2) sharp discrete components with blueshifted velocities of up to -50 km/sec, and (3) some absorption at positive heliocentric velocities up to +20 km/sec. The (Na I)/(Ca II) ratios are found to be 4-200 for component (1), near 1 for component (2), and 0.4 or less for component (3).

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