High resolution NA D and K I interstellar profiles towards stars in the globular cluster M4

Details High resolution NA D and K I interstellar profiles towards stars in the globular cluster M4 High resolution NA D and K I interstellar profiles towards stars in the globular cluster M4

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...278..542k&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 278, no. 2, p. 542-548

Astronomy and Astrophysics

Astrophysics

23

Globular Clusters, Interstellar Gas, Line Spectra, Molecular Clouds, Potassium, Sodium, High Resolution, Iue, Kinematics, Ophiuchi Clouds, Radial Velocity, Telescopes, Ultraviolet Spectroscopy

Scientific paper

Observations are presented of interstellar Na D and K I profiles towards 16 stars in the globular cluster M4. Two strong, low-velocity components are detected, at velocities of approx. = -5 km/s and approx. = +3 km/s. A weaker component at approx. = +20 km/s is detected towards most of the stars in the Na I data. All of these components show considerable variations in strength across the cluster, and the closest pair of stars observed reveal variations in structure in the Interstellar Medium (ISM) on a scale of approx. 0.01 pc. We identify the +3 km/s component with diffuse gas associated with the nearby rho Ophiuchi dark cloud. The -5 km/s component may be associated with an expanding shell around a subgroup of the Sco-Cen association, and is located at less than 150 pc. This component shows large variations in strength and velocity across the cluster. The K I line strengths suggest a more complex variation in the reddening across the cluster than that previously reported.

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