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High-Resolution Observations of Interstellar NA i and CA II Absorption Lines toward the Scorpius OB1 Association

CRAWFORD, IA; BARLOW, MJ; BLADES, JC; (1989) High-Resolution Observations of Interstellar NA i and CA II Absorption Lines toward the Scorpius OB1 Association. Astrophysical Journal , 336 pp. 212-230. 10.1086/167007. Green open access

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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).

Type: Article
Title: High-Resolution Observations of Interstellar NA i and CA II Absorption Lines toward the Scorpius OB1 Association
Open access status: An open access version is available from UCL Discovery
DOI: 10.1086/167007
Publisher version: https://doi.org/10.1086/167007
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Absorption Spectra; B Stars; Calcium; Interstellar Matter; O Stars; Sodium; Galactic Rotation; Stellar Spectra; Velocity Distribution; Astronomy; CLUSTERS: ASSOCIATIONS; INTERSTELLAR: ABUNDANCES; INTERSTELLAR: MATTER
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10096218
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