Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.1203s&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #12.03; Bulletin of the American Astronomical Society, Vol. 31, p.843
Astronomy and Astrophysics
Astronomy
Scientific paper
M82 is one of the nearest examples of a spectacular starburst galaxy and contains hundreds of super star clusters (SSCs). We present a detailed study of one of these clusters (SSC F) based on optical spectroscopy obtained at the 4.2 m William Herschel Telescope at resolutions of 1.6 Angstroms and 10 km s(-1) . We derive M_V=-16.5 for SSC F indicating that it is one of the most luminous and hence most massive clusters known. The blue spectrum (3250-5540 Angstroms) shows features typical of mid-B stars, and we derive an age of 60+/-20 Myr by comparison with theoretical model cluster spectra using the PEGASE spectral synthesis code. The red spectral region contains numerous weak metal absorption lines and a strong Ca II triplet arising in cool supergiants. The brightness and compactness of SSC F make it an ideal candidate for measuring the line of sight velocity dispersion, and hence obtaining the dynamical mass of the cluster. We present the results of such an investigation based on echelle spectroscopy of SSC F in the region of the Ca II triplet. We discuss whether our derived parameters are consistent with SSC F being able to survive to become a globular cluster.
Gallagher Jay S.
Smith Lleweilun J.
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