Browsing FAS Scholarly Articles by Keyword "binaries: general"

Now showing items 1-8 of 8

    • A Determination of the Spin of the Black Hole Primary in LMC X-1 

      Gou, Lijun; McClintock, Jeffrey E.; Liu, Jifeng; Narayan, Ramesh; Steiner, James; Remillard, Ronald A.; Orosz, Jerome A.; Davis, Shane W.; Ebisawa, Ken; Schlegel, Eric M. (IOP Publishing, 2009)
      The first extragalactic X-ray binary, LMC X-1, was discovered in 1969. In the 1980s, its compact primary was established as the fourth dynamical black hole candidate. Recently, we published accurate values for the mass of ...

    • An Empirical Calibration to Estimate Cool Dwarf Fundamental Parameters From H-Band Spectra 

      Newton, Elisabeth R; Charbonneau, David; Irwin, Jonathan; Mann, Andrew W. (IOP Publishing, 2015)
      Interferometric radius measurements provide a direct probe of the fundamental parameters of M dwarfs. However, interferometry is within reach for only a limited sample of nearby, bright stars. We use interferometrically ...

    • Erratum: "Precise Measurement of the Spin Parameter of the Stellar-Mass Black hole M33 X-7” (2008, ApJ, 679, L37) 

      Liu, Jifeng; McClintock, Jeffrey E.; Narayan, Ramesh; Davis, Shane W.; Orosz, Jerome A. (IOP Publishing, 2010)
      In prior work, Chandra and Gemini-North observations of the eclipsing X-ray binary M33 X-7 have yielded measurements of the mass of its black hole primary and the system’s orbital inclination angle of unprecedented accuracy. ...

    • High-Precision Radio and Infrared Astrometry of Lspm J1314+1320ab. I. Parallax, Proper Motions, and Limits on Planets 

      Forbrich, Jan; Dupuy, Trent J.; Reid, Mark Jonathan; Berger, Edo; Rizzuto, Aaron; Mann, Andrew W.; Liu, Michael C.; Aller, Kimberly; Kraus, Adam L. (American Astronomical Society, 2016)
      We present multi-epoch astrometric radio observations with the Very Long Baseline Array (VLBA) of the young ultracool-dwarf binary LSPM J1314+1320AB . The radio emission comes from the secondary star. Combining the VLBA ...

    • The Mass of the Black Hole in Cygnus X-1 

      Orosz, Jerome A.; McClintock, Jeffrey E.; Aufdenberg, Jason P.; Remillard, Ronald A.; Reid, Mark J.; Narayan, Ramesh; Gou, Lijun (IOP Publishing, 2011)
      Cygnus X-1 is a binary star system that is comprised of a black hole and a massive giant companion star in a tight orbit. Building on our accurate distance measurement reported in the preceding paper, we first determine ...

    • Misalignment of Outflow Axes in the Proto-Multiple Systems in Perseus 

      Lee, Katherine I.; Dunham, Michael M.; Myers, Philip C.; Arce, Héctor G.; Bourke, Tyler L.; Goodman, Alyssa; Jørgensen, Jes K.; Kristensen, Lars E.; Offner, Stella S. R.; Pineda, Jaime; Tobin, John J.; Vorobyov, Eduard I. (American Astronomical Society, 2016)
      We investigate the alignment between outflow axes in nine of the youngest binary/multiple systems in the Perseus Molecular Cloud. These systems have typical member spacing larger than 1000 au. For outflow identification, ...

    • On the Origin of the Highest Redshift Gamma-Ray Bursts 

      Belczynski, Krzysztof; Holz, Daniel E.; Fryer, Chris L.; Berger, Edo; Hartmann, Dieter H.; O, Brian (IOP Publishing, 2009)
      GRB 080913 and GRB 090423 are the most distant gamma-ray bursts (GRBs) known to-date, with spectroscopically determined redshifts of z = 6 .7 and z = 8.1, respectively. The detection of bursts at this early epoch of the ...

    • Stellar orbit evolution in close circumstellar disc encounters 

      Munoz, D; Kratter, K.; Vogelsberger, M.; Hernquist, Lars Eric; Springel, V. (Oxford University Press (OUP), 2014)
      The formation and early evolution of circumstellar discs often occurs within dense, newborn stellar clusters. For the first time, we apply the moving-mesh code arepo, to circumstellar discs in 3D, focusing on disc–disc ...