Classification of the Enigmatic Variable XX Sct

Details Classification of the Enigmatic Variable XX Sct Classification of the Enigmatic Variable XX Sct

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...195.7517b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #75.17; Bulletin of the American Astronomical Society, Vol. 31, p.1482

Astronomy and Astrophysics

Astronomy

Scientific paper

The irregular variable XX Sct has been ascribed five different variability types since its discovery in 1924, from a Cepheid to a rapid irregular variable. Surprisingly, this 13m star has virtually no mention in recent literature, though its classification is still a mystery. We sought to resolve this puzzle by a careful reexamination of nearly 1200 blue photographic plates of this star at the Maria Mitchell Observatory. These revealed strong irregular variability of up to 2 magnitudes on different time scales, including Algol-like minima with a timescale of 10 days or less. Several possible periods have been found, none of which are particularly convincing. UBV photometry and a low-resolution optical spectrum are consistent with a reddened A star. We tentatively suggest that XX Sct is one of the class of young, intermediate mass Herbig Ae/Be stars known as UXors. Further examination of these data is needed to confirm this classification. This project was supported by the NSF/REU grant AST-9820555.

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