Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...203.3302s&link_type=abstract
American Astronomical Society Meeting 203, #33.02; Bulletin of the American Astronomical Society, Vol. 35, p.1256
Astronomy and Astrophysics
Astronomy
Scientific paper
Previous observations have shown that V3798 Sgr undergoes erratic light declines with the time scales from years down to days; this allowed for tentative classification of this variable as an UXOR - small group of pre-main sequence stars demonstrating erratic light declines on these time scales. We report on a much faster, only a half-hour, dimming of V3798 Sgr observed in June 2003, during our multicolor, CCD monitoring of this star. The dimming was observed in all the (B, V, R, an I) colors, ranging in amplitude from 0.35 magnitude in B to 0.15 magnitude in I. Such a short time scale, together with the previously observed longer time scales, makes V3798 Sgr a difficult case for classification, because it combines the variability properties of UXOR's and classical T Tau stars. This short time scale also excludes explanations of dimming based on obscuration by dust clouds in a rotating disk or shell. Sudden dust precipitation in a dense (>1011 cm-3), expanding blob of stellar wind is more plausible. This project was supported by the NSF/REU grant AST-0097694 and the Nantucket Maria Mitchell Association.
Steinfadt Justin D. R.
Strelnitski Vladimir
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