Measuring Spectra of B-type Stars to Study Young Open Clusters

Details Measuring Spectra of B-type Stars to Study Young Open Clusters Measuring Spectra of B-type Stars to Study Young Open Clusters

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21715233c&link_type=abstract

American Astronomical Society, AAS Meeting #217, #152.33; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We used spectra of the open clusters NGC 1960, NGC 1502, NGC 7160, NGC 2384, NGC 2244, NGC 2422, and IC 1590 to analyze their B-type stellar populations. The spectral lines He I λλ4388, 4713, 4471, and Hγ at 4340 Å were analyzed to measure the stars’ projected rotational velocity, temperature, and surface gravity. Then by comparing our measurements to the evolutionary tracks of Schaller et al., we determined the masses of the stars. We determined the ages of the clusters by comparing the luminosity and temperature measurements to isochrones by Lejeune & Schaerer. Finally, we calculate the interstellar reddening and distance to each cluster. This work is supported by the NSF REU site grant PHY-0849416, NASA DPR No. NNX09AP86G, and Lehigh University.

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