Rapid variability of the R Coronae Australis reflection nebula NGC 6729

Details Rapid variability of the R Coronae Australis reflection nebula NGC 6729 Rapid variability of the R Coronae Australis reflection nebula NGC 6729

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987pasp...99...91g&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 99, Feb. 1987, p. 91-98.

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23

Reflection Nebulae, Stellar Envelopes, Variable Stars, Brightness, H Alpha Line, Photographic Plates, Spectroscopic Analysis

Scientific paper

Measurable changes in the surface brightness of the reflection nebula associated with R CrA occur over intervals as short as 24 hours. These and other more extreme variations are demonstrated with CCD images obtained over a 23-day period March 10 to April 2, 1984. During this time span R CrA brightened by 1.3 mag. The alterations in the appearance of the nebula NGC 6729 are apparently caused by the shadowing effects of clouds which are very close to the star, probably well within 1 Au. The spectrum of R CrA may itself vary slightly from night to night, and these changes are echoed by the surrounding nebula with an observable time delay. A photograph showing the complicated filamentary structure in NGC 6729 is reproduced and the relation between the reflection nebula and its illuminating star is discussed.

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