Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734003d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #340.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Nine surveys of the Orion Nebula Cluster have been combined into one master catalog. A preliminary analysis of this data set has revealed a number of stars that undergo substantial variations in brightness. While no FU Orionis candidates were found, a number of variables with amplitudes in I between 1 and 3 mag were identified. It is shown that the spatial distribution of these large amplitude variables does not match that of the cluster stars as a whole but exhibits a clear deficiency in the innermost cluster. This suggests that disk accretion, which is thought to drive large amplitude variability in T Tauri stars, is inhibited in the inner ONC. Possible mechanisms for this are proposed, involving the strong UV radiation field and the high density of stars in the core, both of which may affect disk accretion. Support from NASA through its Origins of Solar Systems program is gratefully acknowledged. One of (S. D.) was supported by an NSF/REU grant to Wesleyan University in support of the Keck Northeast Astronomy Consortium.
Dwyer Sara
Herbst William
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