Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7904a&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #79.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present design analysis of a custom near-IR filter for use with ULBCAM on the UH 2.2-m telescope, which in combination with broad-band J and H band photometry, can be used to determine the spectral type of M and L type objects. Our filter is centered on the 1.45 micron steam absorption feature seen prominently in the spectra of M and L type objects, and is predicted to determine spectral type, independent of gravity and reddening, to within one subtype. For identifying young brown dwarfs in star-forming regions, our filter will greatly reduce the number of contaminant field dwarfs, giants, and extragalactic objects, thereby increasing the efficiency of spectroscopic followup by a factor of 2 to 8 over existing photometric selected samples. Unlike existing photometric surveys for young brown dwarfs, the number of contaminant objects for a sample of candidates selected with our filter should not increase for fainter magnitudes. This will allow us to accurately determine the low-mass IMF in star-forming regions.
Allers Katelyn N.
Liu Min
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