Browsing by Author "Drew, J.E."

Now showing items 1-20 of 146

    • The 1st measurement of the Lyman continuum emission from normal stars 

      Hoare, M.G.; Drew, J.E.; Denby, M. (1993)
      We report the first measurements of Lyman continuum emission from non-degenerate stars. The Wide Field Camera on-board ROSAT detected strong emission from Beta CMa (B1 II-III) and Epsilon CMa (B2 II). Both Kurucz LTE ...

    • A 3D extinction map of the northern Galactic plane based on IPHAS photometry 

      Sale, S. E.; Drew, J.E.; Barentsen, G.; Farnhill, H. J.; Raddi, R.; Barlow, M. J.; Eisl̈offel, J.; Vink, J. S.; Rodŕiguez-Gil, P.; Wright, N. J. (2014-10-01)
      We present a 3D map of extinction in the northern Galactic plane derived using photometry from the INT/WFC Photometric Hα Survey of the northern Galactic plane. The map has fine angular (~10 arcmin) and distance (100 pc) ...

    • The AAO/UKST SuperCOSMOS Ha survey 

      Parker, Q.A.; Phillipps, S.; Pierce, M.J.; Hartley, M.; Read, M.; MacGillivray, H.T.; Tritton, S.B.; Cass, C.P.; Cannon, R.D.; Cohen, M.; Drew, J.E.; Frew, D.J.; Hopewell, E.C.; Mader, S.; Malin, D.F.; Masheder, M.R.W.; Morgan, D.H.; Morris, R.A.H.; Russeil, D.; Russell, K.S.; Walker, R.N.F.; Hambly, N.C. (2005)
      The UK Schmidt Telescope (UKST) of the Anglo-Australian Observatory completed a narrow-band H plus [NII] 6548, 6584°A survey of the Southern Galactic Plane and Magellanic Clouds in late 2003. The survey, which was the last ...

    • The application of Monte Carlo methods to the synthesis of spectral line profiles from accretion disc winds 

      Knigge, C.; Woods, J.A.; Drew, J.E. (1995)
      A Monte Carlo line profile synthesis method is presented which allows the radiative transfer of resonantly scattered lines through a stellar wind to be solved exactly. The resulting code is designed to be used primarily ...

    • Are all Young Stars Disc Accretors 

      Vink, J.S.; Drew, J.E.; Harries, T.J.; Oudmaijer, R.D. (Astronomical Society of the Pacific, 2002)
      We demonstrate the importance of Ha spectro-polarimetry in constraining the geometry of Herbig Ae/Be stars. We find that discs are common in Herbig Ae and Be stars, although different polarization signatures may imply ...

    • AstroGrid Virtual Observatory Access to Large Scale Surveys: The IPHAS Galactic Plane Survey - a Science Driven Example 

      Walton, N.A.; Gonzalez-Solares, E.; Irwin, M.J.; Drew, J.E.; Hopewell, E.C.; Greimel, R. (Astronomical Society of the Pacific, 2007)
      This paper describes how the IPHAS galactic plane survey data products are being made available utilizing the AstroGrid Virtual Observatory system (http://www.astrogrid.org). This is enabling the analysis of the large ...

    • Bayesian inference of T Tauri star properties using multi-wavelength survey photometry 

      Barentsen, G.; Drew, J.E.; Vink, J.S.; Sale, S.E. (2013-01-01)
      There are many pertinent open issues in the area of star and planet formation. Large statistical samples of young stars across star-forming regions are needed to trigger a breakthrough in our understanding, but most optical ...

    • Binary star formation : Primary disks and secondary stars 

      Wheelwright, H.E.; Vink, J.S.; Oudmaijer, R.D.; Drew, J.E. (American Institute of Physics (AIP), 2012)
      Most intermediate mass, pre-main-sequence Herbig Ae/Be stars reside in binary systems. As they are young, the properties of these systems allow us to constrain how they form. We have investigated the formation of Herbig ...

    • Boundary-layer temperatures in high accretion rate cataclysmic variables 

      Hoare, M.G.; Drew, J.E. (1991)
      The Zanstra method is used to derive limits on boundary-layer temperatures in eclipsing dwarf novae during outburst and nova-like variables, using the observed He II 1640 and 4686 A recombination lines. It is assumed that ...

    • Candidate planetary nebulae in the IPHAS photometric catalogue 

      Viironen, K.; Greimel, R.; Corradi, R.L.M.; Mampaso, A.; Rodriguez, M.; Sabin, L.; Delgado-Inglada, G.; Drew, J.E.; Giammanco, C.; Gonzalez-Solares, E.; Irwin, M.J.; Miszalski, B.; Parker, Q.A.; Rodriguez-Flores, E.R.; Zijlstra, A.A. (2009)
      Context. We have carried out a semi-automated search for planetary nebulae (PNe) in the INT photometric H-alpha survey (IPHAS) catalogue. We present the PN search and the list of selected candidates. We cross correlate the ...

    • Chandra observations of Cygnus OB2 

      Wright, N.J.; Drake, Jeremy J.; Drew, J.E.; Vink, Jorick S. (Springer Nature, 2012)
      Cygnus OB2 is the nearest example of a massive star forming region, containing over 50 O-type stars and hundreds of B-type stars.We have analyzed two Chandra pointings in Cyg OB2, detecting ∼1,700 X-ray sources, of which ...

    • Chasing the identification of ASCA Galactic Objects (ChIcAGO): An X-ray survey of unidentified sources in the galactic plane. I : Source sample and initial results 

      Anderson, G.E.; Gaensler, B.M.; Kaplan, D.L.A.; Slane, P.O.; Muno, M.P.; Posselt, B.; Hong, J.; Murray, Stephen S.; Steeghs, D.T.H.; Brogan, C.L.; Drake, Jeremy J.; Farrell, S.A.; Benjamin, R.A.; Chakrabarty, D.; Drew, J.E.; Finley, J.P.; Grindlay, J.E.; Lazio, T.J.W.W.; Lee, J.C.; Mauerhan, J.C.; Van Kerkwijk, M.H. (2014-05)
      We present the Chasing the Identification of ASCA Galactic Objects (ChIcAGO) survey, which is designed to identify the unknown X-ray sources discovered during the ASCA Galactic Plane Survey (AGPS). Little is known about ...

    • Classical T Tauri stars with VPHAS+ -I : H α and u-band accretion rates in the Lagoon Nebula M8 

      Kalari, V. M.; Vink, J. S.; Drew, J.E.; Barentsen, G.; Drake, J. J.; Eislöffel, J.; Martín, E.L.; Parker, Q. A.; Unruh, Y.C.; Walton, N. A.; Wright, N. J. (2015-10-11)
      We estimate the accretion rates of 235 Classical T Tauri star (CTTS) candidates in the Lagoon Nebula using $ugri$H$\alpha$ photometry from the VPHAS+ survey. Our sample consists of stars displaying H$\alpha$-excess, the ...

    • The component star masses in RW Tri 

      Poole, T.; Mason, K.O.; Ramsay, G.; Drew, J.E.; Smith, R.C. (2003)

    • Constraints on the outflow in S106IR from HE-I 2.058 mu-m absorption line and H-I emission line profiles 

      Drew, J.E.; Bunn, J.C.; Hoare, M.G. (1993)

    • Decoupled line driven outflow around B and Be stars 

      Porter, J.M.; Drew, J.E. (1995)

    • A deep catalogue of classical Be stars in the direction towards the Perseus Arm : spectral types and interstellar reddenings 

      Raddi, Roberto; Drew, J.E.; Steeghs, D. T. H.; Wright, Nick; Drake, J. J.; Barentsen, Geert; Fabregat, J.; Sale, S. E. (2015-01)
      We present a catalogue of 247 photometrically and spectroscopically confirmed fainter classical Be stars (13 ≲ r ≲ 16) in the direction of the Perseus Arm of the Milky Way (−1° < b < +4°, 120° < ℓ < 140°). The catalogue ...

    • Detection of new planetary nebulae by IPHAS, the Hα survey of the North Galactic plane 

      Corradi, R.L.M.; Greimel, R.; Leisy, P.; Mampaso, A.; Viironen, K.; Kovacevic, A.; Morris, R.; Phillipps, S.; Zijlstra, A.; Irwin, J.; Drew, J.E.; Hopewell, E.C.; Wright, N.; Barlow, M.; Irwin, M.; Walton, N.; Frew, D.J.; Parker, Q. A.; Groot, P.; Sokoloski, J.L.; Zurita, A. (American Institute of Physics (AIP), 2005-11-28)
      IPHAS is an ongoing Hα imaging survey of the North Galactic plane. When completed, it is expected to discover several hundred new Galactic planetary nebulae, in addition to a huge number of Hα emitters. We present here the ...

    • A determination of the space density and birth rate of hydrogen-line (DA) white dwarfs in the Galactic plane, based on the UVEX survey 

      Verbeek, Kars; Groot, Paul J.; Nelemans, Gijs A.; Scaringi, Simone; Napiwotzki, R.; Drew, J.E.; Steeghs, D.T.H.; Casares, Jorge; Corral-Santana, J.M.; Gänsicke, Boris T.; González-Solares, E.A.; Greimel, Robert; Heber, Ulrich; Irwin, Mike J.; Knigge, Christian; Wright, N.J.; Zijlstra, Albert (2013-10-01)
      We present a determination of the average space density and birth rate of hydrogen-line (DA) white dwarfs within a radius of 1 kpc around the Sun, based on an observational sample of 360 candidate white dwarfs with g <19.5 ...

    • Diffuse interstellar bands in the spectra of massive young stellar objects 

      Oudmaijer, R.D.; Busfield, G.; Drew, J.E. (1997)
      We have compared the B−V colour excess, E(B–V), obtained for a sample of five optically visible massive YSOs both from diffuse interstellar bands (DIBs) in their spectra and from their optical continuum slopes. Our targets ...