Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...282..106s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 282, no. 1, p. 106-114
Astronomy and Astrophysics
Astronomy
12
Blue Stars, Star Clusters, Stellar Evolution, Stellar Gravitation, Stellar Interiors, Stellar Structure, Stellar Temperature, Ultraviolet Astronomy, A Stars, Atmospheric Models, B Stars, Light (Visible Radiation), Spectrograms, Stellar Atmospheres, Stellar Models
Scientific paper
We present a detailed spectroscopic determination of effective temperatures and surface gravities of B- and A-type blue straggler stars in four open clusters by means of model atmospheres and new optical/UV spectrograms. By using a new method of analysis which also allows to separate objects not belonging to the cluster under investigation we show for the first time convincingly that blue stragglers are not the result of internal slow mixing processes as proposed by Wheeler (1979) and Saio & Wheeler (1980). Instead, their parameters are consistent with the predictions of normal stellar evolution. We discuss the implications of our result for possible evolutionary scenarios leading to straggling cluster stars.
Napiwotzki Ralf
Schoenberner Detlef
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