Journal
ASTROPHYSICAL JOURNAL
Volume 843, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/aa740a
Keywords
binaries: spectroscopic; stars: emission-line, Be; stars: evolution; stars: individual (60 Cyg); subdwarfs
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Funding
- Association of Universities for Research in Astronomy, Inc., under NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- NASA [NNX10AD60G]
- National Science Foundation [AST-1411654]
- GSU College of Arts and Sciences
- Research Program Enhancement fund of the Board of Regents of the University System of Georgia
- USC Women in Science and Engineering (WiSE)
- DPAC
- NASA [135677, NNX10AD60G] Funding Source: Federal RePORTER
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1411654] Funding Source: National Science Foundation
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We used archival International Ultraviolet Explorer (IUE) high-dispersion, short wavelength spectra data to search for evidence of the spectra of hot subdwarf companions of six rapidly rotating Be stars in binary systems. We searched for the signature of a hot companion through an analysis of the cross-correlation functions (CCFs) of observed and model spectra that were separated into primary and secondary components using a Doppler tomography algorithm and adopted spectroscopic orbital solutions. A positive detection of the flux from a hot companion was made for the reconstructed secondary CCF of just one target, 60. Cygni (B1 Ve). We estimate that the companion of the Be star in 60. Cygni has T-eff = 42 +/- 4 kK, mass ratio M-2/M-1 = 0.15 +/- 0.02, and monochromatic flux ratio f(2)/f(1) = 0.034 +/- 0.002 in the spectral region near 1525 angstrom. If the companions of the other target Be stars are also hot, then they must be faint and contribute less than approximate to 1% of the UV flux (< 0.6% in the case of gamma Cas). We also discuss. a shell episode of Pleione (28 Tau) recorded in the IUE spectran in an appendix.
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