Other
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasp..113.1547h&link_type=abstract
The Publications of the Astronomical Society of the Pacific, Volume 113, Issue 790, pp. 1547-1553.
Other
36
Stars: Individual (Ex Lupi), Stars: Pre-Main-Sequence, Stars: Variables: Other
Scientific paper
EX Lupi is a classical T Tauri star (and the EXor prototype) subject to sporadic outbursts. The historic record shows that it remains at about V=13.2 (or mpg=14.7:) for extended periods, from which it has been observed to brighten to as much as V=8.4 (on one occasion in 1955-1956). During 1993-1994 the star remained slightly above normal minimum, at about V=12.8, and from that level rose to three maxima at V=11.4 and on other occasions to about V=12.0. At minimum light an M0 V absorption spectrum is present. At outburst this spectrum is veiled by a hot continuum (well shown by an IUE exposure), the equivalent widths of the optical-region emission lines decrease, and reverse P Cygni absorption components appear at the higher Balmer lines. The outbursts are believed to be due to episodic infall onto the M0 star.
Aspin Colin
Gilmore Alan C.
Herbig George H.
Imhoff Catherine L.
Jones Albert F.
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