• 2006 Whole Earth Telescope Observations Of GD358: A New Look At The Prototype DBV 

    Provencal, J. L.; Montgomery, Michael H.; Kanaan, A.; Shipman, H. L.; Childers, D.; Baran, A.; Kepler, S. O.; Reed, M.; Zhou, A.; Eggen, J.; Watson, T. K.; Winget, D. E.; Thompson, Susan E.; Riaz, B.; Nitta, Atsuko; Kleinman, S. J.; Crowe, R.; Slivkoff, J.; Sherard, P.; Purves, N.; Binder, P.; Knight, R.; Kim, S. L.; Chen, W. P.; Yang, M.; Lin, H. C.; Lin, C. C.; Chen, C. W.; Jiang, X. J.; Sergeev, A. V.; Mkrtichian, D.; Andreev, M.; Janulis, R.; Siwak, M.; Zola, S.; Koziel, D.; Stachowski, G.; Paparo, M.; Bognar, Z.; Handler, G.; Lorenz, D.; Steininger, B.; Beck, P.; Nagel, T.; Kusterer, D.; Hoffman, A.; Reiff, E.; Kowalski, R.; Vauclair, G.; Charpinet, S.; Chevreton, M.; Solheim, J. E.; Pakstiene, E.; Fraga, L.; Dalessio, J. (2009-03)
    We report on the analysis of 436.1 hr of nearly continuous high-speed photometry on the pulsating db white dwarf GD358 acquired with the Whole Earth Telescope (WET) during the 2006 international observing run, designated ...
  • The 69 μm forsterite band in spectra of protoplanetary disks. Results from the Herschel DIGIT programme 

    Sturm, B.; Bouwman, J.; Henning, T.; Evans, N. J.; Waters, Lbfm; van Dishoeck, E. F.; Green, J. D.; Olofsson, J.; Meeus, G.; Maaskant, K.; Dominik, C.; Augereau, J. C.; Mulders, G. D.; Acke, B.; Merin, B.; Herczeg, G. J.; Digit Team (2013-05)
    Context. We have analysed far-infrared spectra of 32 circumstellar disks around Herbig Ae/Be and T Tauri stars obtained within the Herschel key programme Dust, Ice and Gas in Time (DIGIT). The spectra were taken with the ...
  • The Absence of Radio Emission from the Globular Cluster G1 

    Miller-Jones, J. C. A.; Wrobel, J. M.; Sivakoff, G. R.; Heinke, C. O.; Miller, R. E.; Plotkin, R. M.; Di Stefano, R.; Greene, J. E.; Ho, L. C.; Joseph, T. D.; Kong, A. K. H.; Maccarone, T. J. (2012-08)
    The detections of both X-ray and radio emission from the cluster G1 in M31 have provided strong support for existing dynamical evidence for an intermediate-mass black hole (IMBH) of mass (1.8 +/- 0.5) x 10(4) M-circle dot ...
  • The Absolute Magnitude Of RRc Variables From Statistical Parallax 

    Kollmeier, Juna A.; Szczygiel, Dorota M.; Burns, Christopher R.; Gould, Andrew; Thompson, Ian B.; Preston, George W.; Sneden, Christopher; Crane, Jeffrey D.; Dong, Subo; Madore, Barry F.; Morrell, Nidia; Prieto, Jose L.; Shectman, Stephen; Simon, Joshua D.; Villanueva, Edward (2013-09)
    We present the first definitive measurement of the absolute magnitude of RR Lyrae c-type variable stars (RRc) determined purely from statistical parallax. We use a sample of 242 RRc variables selected from the All Sky ...
  • The Abundance Of Boron In Diffuse Interstellar Clouds 

    Ritchey, A. M.; Federman, S. R.; Sheffer, Y.; Lambert, David L. (2011-02)
    We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope. Our sample of 56 Galactic sight ...
  • Abundances Of Light Elements In Metal-Poor Stars IV. Fe/O And Fe/Mg Ratios And The History Of Star Formation In The Solar Neighborhood 

    Gratton, Raffaele Gratton; Carretta, Eugenio; Matteucci, Francesca; Sneden, Christopher (2000-06)
    The accurate O, Mg and Fe abundances derived in previous papers of this series from a homogeneous reanalysis of high quality data for a large sample of stars are combined with stellar kinematics in order to discuss the ...
  • Abundances Of Light Elements In Metal-Poor Stars IV. Fe/O And Fe/Mg Ratios And The History Of Star Formation In The Solar Neighborhood 

    Gratton, Raffaele Gratton; Carretta, Eugenio; Matteucci, Francesca; Sneden, Christopher (2000-06)
    The accurate O, Mg and Fe abundances derived in previous papers of this series from a homogeneous reanalysis of high quality data for a large sample of stars are combined with stellar kinematics in order to discuss the ...
  • The Abundances of Light Neutron-Capture Elements in Planetary Nebulae. II. S-Process Enrichments and Interpretation 

    Sterling, N. C.; Dinerstein, Harriet L. (2008-01)
    We present the results of a large-scale survey of neutron(n)-capture elements in Galactic planetary nebulae (PNe), undertaken to study enrichments from s-process nucleosynthesis in their progenitor stars. From new K-band ...
  • The Abundances of Light Neutron-Capture Elements in Planetary Nebulae. III. The Impact of New Atomic Data on Nebular Selenium and Krypton Abundance Determinations 

    Sterling, N. C.; Porter, R. L.; Dinerstein, Harriet L. (2015-06)
    The detection of neutron(n)-capture elements in several planetary nebulae (PNe) has provided a new means of investigating s-process nucleosynthesis in low-mass stars. However, a lack of atomic data has inhibited accurate ...
  • Abundances Of Neutron-Capture Elements In Metal-Poor Stars 

    Gratton, Raffaele Gratton; Sneden, Christopher (1994-06)
    We use a large set of high S/N, high resolution spectra of 19 stars with -2.8 <[Fe/H]< 0 to study the abundances of neutron-rich elements in metal-poor stars. Basic data (atmospheric parameters, iron abundances, abundance ...
  • The Abundances Of Neutron-Capture Species In The Very Metal-Poor Globular Cluster M15: A Uniform Analysis Of Red Giant Branch And Red Horizontal Branch Stars 

    Sobeck, Jennifer S.; Kraft, Robert P.; Sneden, Christopher; Preston, George W.; Cowan, John J.; Smith, Graeme H.; Thompson, Ian B.; Shectman, Stephen A.; Burley, Gregory S. (2011-06)
    The globular cluster M15 is unique in its display of star-to-star variations in the neutron-capture elements. Comprehensive abundance surveys have been previously conducted for handfuls of M15 red giant branch (RGB) and ...
  • The Abundances Of Polyacetylenes Toward CRL618 

    Fonfria, J. P.; Cernicharo, J.; Richter, Matthew J.; Lacy, John H. (2011-02)
    We present a mid-infrared high spectral resolution spectrum of CRL618 in the frequency ranges 778-784 and 1227-1249 cm(-1) (8.01-8.15 and 12.75-12.85 mu m) taken with the Texas Echelon-cross-Echelle Spectrograph (TEXES) ...
  • Accretion Disk Temperatures Of QSOs: Constraints From The Emission Lines 

    Bonning, E. W.; Shields, Gregory A.; Stevens, A. C.; Salviander, Sarah (2013-06)
    We compare QSO emission-line spectra to predictions based on theoretical ionizing continua of accretion disks. The observed line intensities do not show the expected trend of higher ionization with theoretical accretion ...
  • Accretion disks in low-mass X-ray binaries in ultraviolet and optical wavelengths 

    Bayless, Amanda Jo (2010-08)
    We present new models for two low-mass X-ray binaries (LMXB), 4U 1822-371 and V1408 Aql (= 4U 1957+115). The eclipsing LMXB 4U 1822-371 is the prototypical accretion disk corona (ADC) system. We have obtained new time-resolved ...
  • Accretion Onto "Seed" Black Holes In The First Galaxies 

    Milosavljevic, Milos; Bromm, Volker; Couch, Sean M.; Oh, S. Peng (2009-06)
    The validity of the hypothesis that the massive black holes in high redshift quasars grew from stellar-sized "seeds" is contingent on a seed's ability to double its mass every few 10 million years. This requires that the ...
  • Accretion onto Intermediate-Mass Black Holes in Dense Protogalactic Clouds 

    Milosavljevi?, Miloš; Couch, Sean M.; Bromm, Volker (2009-05)
    We present the first results from two-dimensional simulations of radiatively efficient accretion of metal-free gas onto intermediate-mass black holes. We fix the shape of the spectral energy distribution of the radiation ...
  • Accretion Onto Planetary Mass Companions of Low-Mass Young Stars 

    Zhou, Yifan; Herczeg, Gregory J.; Kraus, Adam L.; Metchev, Stanimir; Cruz, Kelle L. (2014-03)
    Measurements of accretion rates onto planetary mass objects may distinguish between different planet Formation mechanisms, which predict different accretion histories. In this Letter, we use Hubble Space Telescope (HST)/WFC3 ...
  • The ACS Nearby Galaxy Survey Treasury. III. Cepheids In The Outer Disk Of M81 

    McCommas, Les P.; Yoachim, Peter; Williams, Benjamin F.; Dalcanton, Julianne J.; Davis, Matthew R.; Dolphin, Andrew E. (2009-06)
    The ACS Nearby Galaxy Survey Treasury (ANGST) has acquired deep ACS imaging of a field in the outer disk of the large spiral galaxy M81. These data were obtained over a total of 20 Hubble Space Telescope orbits, providing ...
  • The ACS Survey Of Galactic Globular Clusters. VI. NGC 6366: A Heavily Stripped Galactic Globular Cluster 

    Paust, Nathaniel E. Q.; Aparicio, Antonio; Piotto, Giampaolo; Reid, I. Neill; Anderson, Jay; Sarajedini, Ata; Bedin, Luigi R.; Chaboyer, Brian; Dotter, Aaron; Hempel, Maren; Majewski, Steven; Marin-Franch, A.; Milone, Antonio; Rosenberg, Alfred; Siegel, Michael (2009-01)
    We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic globular clusters (GCs) to construct a color-magnitude diagram for the bulge cluster, NGC 6366. The luminosity function derived ...
  • The ACS Survey Of Galactic Globular Clusters. VIII. Effects Of Environment On Globular Cluster Global Mass Functions 

    Paust, Nathaniel EQ; I. Neill Reid; Giampaolo Piotto; Antonio Aparicio; Jay Anderson; Ata Sarajedini; Luigi R. Bedin; Chaboyer, Brian; Dotter, Aaron; Hempel, Maren; Majewski, Steven; Marin-Franch, A.; Milone, Antonio; Rosenberg, Alfred; Siegel, Michael (2010-02)
    We have used observations obtained as part of the Hubble Space Telescope/ACS Survey of Galactic Globular Clusters to construct global present-day mass functions for 17 globular clusters utilizing multi-mass King models to ...