X-Ray Observations of EX Lupi Following Optical Flaring

Details X-Ray Observations of EX Lupi Following Optical Flaring X-Ray Observations of EX Lupi Following Optical Flaring

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21460409t&link_type=abstract

American Astronomical Society, AAS Meeting #214, #604.09

Astronomy and Astrophysics

Astronomy

Scientific paper

In January 2008, the Classical T Tauri star EX Lupi was observed to undergo a major optical flaring event, the largest recorded since the mid 1950s. It is currently thought that this type of large-scale variability is due to a sudden massive accretion event. Using target of opportunity observations from the Chandra X-Ray Observatory and ACIS, we have observed EX Lupi three times from March to October of 2008. The data appear to show that the x-ray count rate has decreased over the course of the observing program, and the decrease in X-ray flux appears correlated with variations in the optical, based on data retrieved from the AAVSO. These results suggest that at least some of the X-rays seen toward EX Lupi during the optical eruption episode were accretion generated. Low-resolution spectra are presented with model fits of plasma temperature.

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