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Evolution and origin of Blue Stragglers in 47 Tucanae

Published online by Cambridge University Press:  11 March 2020

Javiera Parada Open the ORCID record for Javiera Parada [Opens in a new window] ,
Harvey Richer ,
Jeremy Heyl ,
Jason Kalirai  and
Ryan Goldsbury
Javiera Parada
Affiliation:
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, Canada email: jparada@phas.ubc.ca
Harvey Richer
Affiliation:
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, Canada email: jparada@phas.ubc.ca
Jeremy Heyl
Affiliation:
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, Canada email: jparada@phas.ubc.ca
Jason Kalirai
Affiliation:
Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, Maryland, USA
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Abstract

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Using data from the core of 47 Tuc we have identified stars in different evolutionary stages in the colour-magnitude diagram, and used the effects of mass segregation on their radial distribution to study the evolution and origin of blue stragglers (BSS). We separate the BSS into 2 samples by their magnitude and find considerable differences in their distribution. Bright BSS are more centrally concentrated with mass estimates over twice the turn-off mass suggesting an origin involving a triple or multiple star system. The distribution of the faint BSS is close to that of the main-sequence (MS) binaries pointing to these stars as their likely progenitors. Using MESA models, we calculate the expected number of stars in each evolutionary stage and compare it with the observed number of stars. Results indicate that BSS have a post-MS evolution comparable to that of a normal star of the same mass and a MS-BSS lifetime of about 200 – 300 Myr.

Keywords

blue stragglersglobular clusters47 Tucanaecolour magnitude diagramsstellar evolutionkinematics and dynamics.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S351: Star Clusters: From the Milky Way to the Early Universe , May 2019 , pp. 486 - 489
Copyright
© International Astronomical Union 2020

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