Physics
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aan...368....1t&link_type=abstract
AAVSO Alert Notice 368
Physics
Ex Lup, Pre Main-Sequence Variable, Eruptive Variable, Aavso International Database
Scientific paper
As announced in AAVSO Special Notice #93, he pre main-sequence eruptive variable EX Lup appears to be undergoing a major outburst, exceeding the previous brightest maximum recorded in 1955. Albert Jones (Nelson, NZ) reports that EX Lup reached a visual magnitude of 7.9 on 2008 Jan 29.66 UT. This exceeds the previous brightest recorded magnitude of this object (m(vis) = 8.7 on 1955 October 5 and December 17. During the current episode of activity, the star underwent an initial outburst that reached a maximum of m(vis) = 9.5 on 2008 January 19.6236 UT; it subsequently faded erratically to a minimum of m(vis) = 10.7 on 2008 January 23.6181 UT, after which it began to rise again. Recent observations reported by Albert Jones indicate a rapid rise since January 23: m(vis)=10.4 at 2008 Jan 26.64; m(vis)=9.5 at 2008 Jan 28.63; and m(vis)=7.9 at 2008 Jan 29.66. Observers are urgently requested to observe this star during the current outburst. Both visual magnitude estimates and filtered instrumental photometry are requested. Observations should be submitted to the AAVSO International Database as EX LUP.
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