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The typical product of the star formation process is a multiple star system, most commonly a binary star. Binaries have provided the first dynamical measures of the masses of pre-main-sequence (PMS) stars. These measurements have established that T Tauri-like stars are indeed of solar mass or less, and have provided preliminary support for the mass(More)
We have obtained three long-slit, far UV spectra of the pre-main sequence system T Tauri. These HST/STIS spectra show a strong and variable on-source spectrum composed of both fluoresced H 2 and stellar chromospheric lines. Extended H 2 emission is seen up to 10 ′′ from the T Tau system. The on-source and extended H 2 are both pumped by H I Lyman α. The(More)
We present an astrometric/spectroscopic orbital solution for the pre-main-sequence binary NTT 045251+3016. Interferometric observations with the HST FGS3 allowed stellar separations as small as 14 mas to be measured. Optical spectra provided 58 radial-velocity measurements of the primary star and near-infrared spectra provided 2 radial-velocity measurements(More)
  • Anne Dutrey, Emmanuel Di Folco, Stéphane Guilloteau, Yann Boehler, Jeff Bary, Tracy Beck +8 others
  • 2014
The formation of planets around binary stars may be more difficult than around single stars. In a close binary star (with a separation of less than a hundred astronomical units), theory predicts the presence of circumstellar disks around each star, and an outer circumbinary disk surrounding a gravitationally cleared inner cavity around the stars. Given that(More)
We, the dissertation committee for the above candidate for the Doctor of Philosophy degree, hereby recommend acceptance of this dissertation. 2014 We considered the bacterial metabolic system as a complex network , studied the mapping of regulatory network onto metabolic pathways, and examined how the force of evolution shapes their connections and results(More)
We investigate the use of the gravity sensitive neutral sodium (Na i) doublet at 8183 Å and 8195 Å (Na 8200 Å doublet) as an age indicator for M dwarfs. We measured the Na doublet equivalent width (EW) in giants, old dwarfs, young dwarfs, and candidate members of the β Pic moving group using medium-resolution spectra. Our Na 8200 Å doublet EW analysis shows(More)
We have observed a large sample of spectroscopic binary stars in the Hyades Cluster, using high resolution infrared spectroscopy to detect low mass companions. We combine our double-lined infrared measurements with well constrained orbital parameters from visible light single-lined observations to derive dynamical mass ratios. Using these results, along(More)
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