Further observations of the planetary nebula in the globular cluster M22

Details Further observations of the planetary nebula in the globular cluster M22 Further observations of the planetary nebula in the globular cluster M22

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj.....99.1863c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 99, June 1990, p. 1863-1866. Research supported by NSF.

Astronomy and Astrophysics

Astronomy

15

Binary Stars, Globular Clusters, Planetary Nebulae, Stellar Spectrophotometry, Charge Coupled Devices, Color-Magnitude Diagram, Interstellar Extinction, Interstellar Matter, Sagittarius Constellation

Scientific paper

The proper motion of the central star of the newly-discovered planetary nebula in the globular cluster M22 strongly confirms cluster membership, in agreement with radial-velocity data from the discovery group. An accurate optical position of the central star differs by a few arcseconds from the IR source position derived by the discoverers. Photographic photometry of the star on plates spanning nearly a century shows that the star has probably brightened by about 0.2 mag since 1900, but there is no evidence of variations on shorter timescales. Dust within the nebula is probably responsible for the excess reddening of the background red companion to the central star.

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