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Observing Massive Binaries with the CHARA Array

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Observing Massive Binaries with the CHARA Array

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  1. Douglas Gies, Gail Schaefer, Tabetha Boyajian, Theo ten Brummelaar, Saida Caballero Nieves, Rachel Matson, Hal McAlister, David O’Brien, Noel Richardson, Nils Turner, Stephen Williams (Georgia State University) B. Mason, W. Hartkopf (USNO), L. Roberts (JPL), E. Nelan (STScI), J. Aufdenberg (ERAU), S. Ridgway (NOAO), M. Zhao, J. Monnier (UM),C. T. Bolton (UToronto), D. Peterson (SUNY-SB) Observing Massive Binarieswith the CHARA Array

  2. Intrinsic to star formation process? • masses • dynamics • evolution

  3. Mason et al. (1998, 2009)

  4. Missing Period Range • CHARA Survey (Turner) • HST/Fine Guidance Sensor (FGS) Program (~300 O-stars; Cyg OB2, NGC 3603)

  5. FGS TRANS mode Scans

  6. Multiples Among Massive Stars: FGS/Speckle Program on 15 Mon • O7 Ve • Original orbit (Gies et al. 1997) needs revision • Possible triple

  7. Multiples Among Massive Stars:Cyg OB2 #12 • MIRC: Cyg OB2#12, massive B-hypergiant (triple?)Negueruela et al. (2008)

  8. Multiples Among Massive Stars:Sigma Ori AB • A-B 0.25 arcsec, 170 year period • A spectroscopic companion found to A (143 d) with very high eccentricity • Kozai mechanism? • Need CHARA MIRC and/or PAVO Sigma Ori E is a magnetic star with co-rotating clouds, a key target for VEGA(image: R. Townsend)

  9. Binaries & Runaway Stars:Iota Ori (Boyajian, O’Brien) • Formed 2 Myr ago in binary – binary encounter • New spectroscopic and astrometric orbit • SB2, P=29 d • Classic and MIRC

  10. Binaries and Interior Structure:Spica (Aufdenberg et al.) • Apsidal motion constant: more centrally condensed

  11. Interacting Binaries: Beta Lyr • MIRC H-band (Zhao et al. 2008) + Classic K-band • Gas torus around mass gainer (Nazarenko & Glazunova 2006)

  12. Evolved Binaries: Be Stars • Were Be stars spun up by prior mass transfer in binaries? • Hot subdwarf companion found in Phi Per and FY CMa • Search for companions with high dynamic range interferometry

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