Young blue straggler stars in the Galactic field

Gemunu Ekanayake, Ronald Wilhelm

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this study, we present an analysis of a sample of field blue straggler (BS) stars that show high ultra violet emission in their spectral energy distributions (SEDs): indication of a hot white dwarf (WD) companion to BS. Using photometry available in the Sloan Digital Sky Survey (SDSS) and Galaxy Evolution Explorer (GALEX) surveys, we identified 80 stars with ultraviolet (UV) excess. To determine the parameter distributions (mass, temperature, and age) of the WD companions, we developed a fitting routine that could fit binary model SEDs to the observed SED. Results from this fit indicate the need for a hot WD companion to provide the excess UV flux. The WD mass distribution peaks at ~0.4M, suggesting the primary formation channel of field BSs is case B mass transfer, i.e. when the donor star is in red giant phase of its evolution. Based on stellar evolutionary models, we estimate the lower limit of the binary mass transfer efficiency to be β ~ 0.5.

Original languageEnglish
Pages (from-to)2623-2629
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume479
Issue number2
DOIs
StatePublished - Sep 11 2018

Bibliographical note

Publisher Copyright:
© 2018 The Author(s).

Keywords

  • Binary stars
  • Blue stragglers
  • GALEX
  • SDSS
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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