Emission line variability in a newly discovered 2MASS star

Details Emission line variability in a newly discovered 2MASS star Emission line variability in a newly discovered 2MASS star

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003noao.prop..234g&link_type=abstract

NOAO Proposal ID #2003A-0234

Computer Science

Scientific paper

We propose to utilize the HET/HRS to obtain spectra of the newly discovered, low-mass star 2M075223.9+161215. The primary objectives are to search for (1) variability in the strength and position of the H(alpha) emission line profile and (2) determine if the Li I (lambda)6707 feature is present to confirm whether this enigmatic object is a field brown dwarf. Previous HET/HRS spectra of this object were obtained on the night of UT 01 April 2002. However, the S/N in the Li region was insufficient to arrive at a definitive conclusion concerning the presence of lithium in 2M075223.9. The additional spectra will be co-added to the previous spectra in order to examine the complex (lambda)6707 region in more detail. Of equal importance, the detection of either short- or long- term variability will yield insight on the origin of the emission line mechanism. The two competing models for the origin of the strong emission line spectrum involve either strongly enhanced chromospheric activity driven by magnetic dynamo action or accretion in a low mass binary system.

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