Spectral Types of Stars in Stellar Clusters found in 2MASS

Details Spectral Types of Stars in Stellar Clusters found in 2MASS Spectral Types of Stars in Stellar Clusters found in 2MASS

Feb 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002noao.prop..351p&link_type=abstract

NOAO Proposal ID #2002A-0351

Physics

Scientific paper

We propose to obtain 2 (micron) spectra of heavily reddened stars in OB associations found through 2MASS. Our goal is to use these spectra to obtain spectral types, and thus select a sample of heavily reddened (A_V > 10) main sequence O, B, and A stars, both behind molecular gas and neutral gas. Our ultimate goal is to obtain moderate-resolution ((lambda) / (Delta) (lambda)=1200) 3 (micron) spectroscopy of these stars with no circumstellar dust yet high column densities of foreground molecular or neutral gas. This will greatly increase the number of stars in which absorption from H_2O and CH_3OH ices, aliphatic hydrocarbons, aromatic hydrocarbons, and the unidentified 3.47 (micron) feature can be observed without interference from circumstellar dust or photospheric molecular lines. To date, the only source with a published 3 (micron) moderate-resolution spectrum that fits these criteria is IV Cyg #12, a B hypergiant reddened by neutral gas in the diffuse ISM.

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