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• W2150092972 abstract "We present high signal-to-noise ratio optical spectra of two luminous super star clusters in the starburst galaxy M82. The data for cluster F and the nearby, highly reddened, cluster L were obtained with the William Herschel Telescope (WHT) at a resolution of 1.6 υ. The blue spectrum (3250–5540 υ) of cluster F shows features typical of mid-B stars. The red spectra (5730–8790 υ) of clusters F and L show the Ca ii triplet and numerous F- and G-type absorption features. Strong Ca ii and Na i interstellar absorption lines arising in M82 are also detected, and the λ 6283 diffuse interstellar band appears to be present. The quality of the WHT spectra allows us to improve previous age estimates considerably for cluster F. By comparing the blue spectrum with theoretical model cluster spectra using the pegase spectral synthesis code, we derive an age of 60 ± 20 Myr. The strength of the Ca ii triplet is also in accord with this age. Cluster L appears to have a similar age, although this is much less certain. The measured radial velocities for the two clusters differ substantially, indicating that they are located in different regions of the M82 disc. Cluster F appears to be deep in M82, slightly beyond the main starburst region, while the highly obscured cluster L lies near the outer edges of the disc. We derive an absolute magnitude MV = −16.5 for F, indicating that it is an extremely massive cluster. The presence of such a luminous super star cluster suggests that the M82 starburst experienced an episode of intense star formation ≈60 Myr ago." @default.
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• W2150092972 date "1999-04-15" @default.
• W2150092972 modified "2023-10-18" @default.
• W2150092972 title "Stellar populations and ages of M82 super star clusters" @default.
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• W2150092972 doi "https://doi.org/10.1046/j.1365-8711.1999.02352.x" @default.
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