Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pasa...26...31l&link_type=abstract
Publications of the Astronomical Society of Australia, Volume 26, Issue 1, pp. 31-36.
Astronomy and Astrophysics
Astronomy
Open Clusters And Associations: Individual (Chamaeleon I), Stars: Individual (Chxr 3, Chxr 20, Chxr 33, Chxr 37, Chxr 40, Chxr 47, Chxr 53, Chxr 59, Chxr 71, Chxr 85), Stars: Pre-Main Sequence, Stars: Rotation, Stars: Spots, Binaries: Eclipsing
Scientific paper
We present the results of a photometric survey for variability in ten X-ray-emitting low-mass stars in the Chamaeleon region. Eight of the stars we observed are bona fide pre-main-sequence members of the ~2 Myr-old Chamaeleon I star-forming cloud. The other two stars are young with high levels of relative X-ray emission, but with discordant proper motions they are probable non-members of the cloud. In six of the stars we monitored, periodic variations on timescales of 2.5-11.5 d were detected, that we ascribe to stellar rotation and the presence of cool starspots. Two other stars, CHXR 20 and CHXR 85, show large amplitude variations at visual and near-infrared wavelengths and are candidate eclipsing binaries. Compared to the rotational properties of low-mass stars in the ~8 Myr-old η Chamaeleontis cluster, we find that the older η Chamaeleontis stars have several times higher surface specific angular momentum than the younger Chamaeleon I stars. The apparent increase in angular momentum between ~2 and 8 Myr might be due to changes in stellar internal structure as the stars evolve, or evidence for a different rotational history between members of the two star-forming regions.
Crause Lisa A.
Lawson Warrick A.
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