Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..600b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 15, 1991, p. 600-605. Research supported by S
Astronomy and Astrophysics
Astronomy
9
Globular Clusters, Hydrogen Clouds, Interstellar Matter, Spectral Line Width, Absorption Spectra, Cosmic Dust, Interstellar Extinction, Ultraviolet Spectra, Visible Spectrum
Scientific paper
High-resolution optical spectra of interstellar absorption lines are used to examine reddening variations across the globular cluster M22 which are produced by the nearby low-velocity gas. Fifteen cluster stars together with three stars within 1.3 deg of the cluster were observed in the Na D lines and in some case also the K I (7699 A) line. Optical and ultraviolet spectra of closer stars which lie within several degrees of M22 confirm that a rapid increase in gas-column density occurs at a distance of approximately 100 pc, but the material is considerably more extensive in thickness than has been suggested previously. Although the current schematic models for the Loop I and local bubbles describe in a general way some of the observed features of this local interstellar material, they cannot account directly for the properties and thickness of the gas determined in the present study.
Bates Brandon
Gilheany S.
Wood D. K.
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