Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.281.1001j&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 281, Issue 3, pp. 1001-1015.
Astronomy and Astrophysics
Astronomy
9
Stars: Activity, Stars: Individual: 2Re J0241-525, Stars: Late-Type, Stars: Pre-Main-Sequence, Stars: Rotation, X-Rays: Stars
Scientific paper
We present high-spatial-resolution X-ray observations, photometry and spectroscopy of the two low-mass, active stars proposed as optical counterparts to the extreme ultraviolet source 2RE J0241-525 (=EUVE J0241-530). It is confirmed that both stars, which are of types dK7e and dM3e and separated by 22 arcsec, are sources of soft X-ray emission and exhibit substantial chromospheric activity. Radial velocity measurements indicate that the two components are physically associated and most probably single. The projected equatorial velocities are measured as 75+/-3 and 11.7+/-0.7 km s^-1 for the hotter and cooler components respectively and, whilst the hotter component has a relatively high photospheric lithium abundance, log N(Li)=1.5+/-0.2, we are unable to detect any lithium in the cooler star. Isochrone fitting to this `mini-cluster' yields an age of 3-70 Myr and a distance of 19-60 pc. An empirical comparison of the lithium abundances with those for similar stars in young clusters and associations suggests a narrower age range of 5-30 Myr and a corresponding distance of 26-50 pc. We conclude that this object is a nearby post-T Tauri system, but we cannot locate any possible birth site. It appears unlikely that the system can have been ejected from a nearby open cluster in a two- or three-body encounter.
Buckley David A. H.
James David J.
Jeffries Robin D.
Stauffer Joh R.
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