The 1993-1994 Activity of EX Lupi
Abstract
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.
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- December 2001
- DOI:
- 10.1086/324420
- Bibcode:
- 2001PASP..113.1547H
- Keywords:
-
- stars: individual (EX Lupi);
- Stars: Pre-Main-Sequence;
- Stars: Variables: Other