Browsing Research publications by Author "Wright, N.J."

Now showing items 1-19 of 19

    • A 3D photoionization model of the extreme planetary nebula NGC 6302 

      Wright, N.J.; Barlow, M.J.; Ercolano, B.; Rauch, T. (2011-11-01)
      We present a 3D photoionization model of the planetary nebula NGC 6302, one of the most complex and enigmatic objects of its kind. Its highly bipolar geometry and dense massive disc, coupled with the very wide range of ...

    • The Chandra COSMOS Survey III : Optical and infrared identification of X-ray point sources 

      Civano, F.; Elvis, M.; Aldcroft, T.; Fruscione, A.; Hao, H.; Lanzuisi, G.; Wright, N.J.; Brusa, M.; Salvato, M.; Bongiorno, A.; Comastri, A.; Zamorani, G.; Cappelluti, N.; Gilli, R.; Lusso, E.; Vignali, C.; Fiore, F.; Capak, P.; Scoville, N.Z.; Cisternas, M.; Kartaltepe, J.; Koekemoer, A. M.; Impey, C.D.; Trump, J.; Mainieri, V.; Miyaji, T.; Lilly, S.; Masters, D.; Puccetti, S.; Schawinski, K.; Urry, M.; Silverman, J. (2012-08-01)
      The Chandra COSMOS Survey (C-COSMOS) is a large, 1.8 Ms, Chandra program that has imaged the central 0.9 deg2 of the COSMOS field down to limiting depths of 1.9×10−16 erg cm−2 s−1 in the soft (0.5–2 keV) band, 7.3×10−16 ...

    • 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 ...

    • Constraints on the ubiquity of coronal X-ray cycles 

      Hoffman, J.; Günther, H.M.; Wright, N.J. (2012-11-10)
      Stellar activity cycles are known to be a widespread phenomenon amongst moderately active solar- and late-type stars from long-term periodic variations in chromospheric Ca II H and K emission lines, yet to date, only a ...

    • 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 ...

    • Extreme infrared variables from UKIDSS-I : A concentration in star-forming regions 

      Contreras Peña, C.; Lucas, P.W.; Froebrich, D.; Kumar, M.S.N.; Goldstein, J.; Drew, J.E.; Adamson, A.J.; Davis, C.J.; Barentsen, Geert; Wright, N.J. (2014-04-01)
      We present initial results of the first panoramic search for high-amplitude near-infrared variability in theGalactic plane.We analyse the widely separated two-epoch K-band photometry in the fifth and seventh data releases ...

    • First results of an Hα based search of classical Be stars in the Perseus Arm and beyond 

      Raddi, R.; Drew, J.E.; Farnhill, H.J.; Fabregat, J.; Steeghs, D.; Wright, N.J.; Drake, J.J.; Sale, S.E.; Barlow, M.J.; Greimel, R.; Sabin, L.; Corradi, R.M.L. (2013-04)
      We investigate a region of the Galactic plane, between 120° ≤ l ≤ 140° and-1° ≤ b≤+4°, and uncover a population of moderately reddened (E(B-V) ~ 1) classical Be stars within and beyond the Perseus and Outer Arms. 370 ...

    • The interactions of winds from massive young stellar objects : X-ray emission, dynamics and cavity evolution 

      Parkin, E.R.; Pittard, J.M.; Hoare, M.G.; Wright, N.J.; Drake, J.J. (2009-12-01)
      Two-dimensional axis-symmetric hydrodynamical simulations are presented which explore the interaction of stellar and disc winds with surrounding infalling cloud material. The star and its accompanying disc blow winds inside ...

    • The ionized nebula surrounding the red supergiant W26 in westerlund 1 

      Wright, N.J.; Wesson, R.; Drew, J.E.; Barentsen, G.; Barlow, M.J.; Walsh, J.R.; Zijlstra, A.; Drake, J.J.; Eisl̈offel, J.; Farnhill, H.J. (2014-01)
      We present Hα images of an ionized nebula surrounding theM2-5Ia red supergiant (RSG)W26 in the massive star cluster Westerlund 1. The nebula consists of a circumstellar shell or ring ̃0.1 pc in diameter and a triangular ...

    • IRAS 20050+2720 : Anatomy of a young stellar cluster 

      Günther, H.M.; Wolk, S.J.; Spitzbart, B.; Forbrich, J.; Wright, N.J.; Bourke, T.L.; Gutermuth, R.A.; Allen, L.; Megeath, S.T.; Pipher, J.L. (2012-10-01)
      IRAS 20050+2720 is young star-forming region at a distance of 700 pc without apparent high-mass stars. We present results of our multi-wavelength study of IRAS 20050+2720 which includes observations by Chandra and Spitzer, ...

    • The massive star-forming region Cygnus OB2. I : Chandra catalog of association members 

      Wright, N.J.; Drake, J.J. (2009)
      We present a catalog of 1696 X-ray sources detected in the massive star-forming region (SFR) Cygnus OB2 and extracted from two archival Chandra observations of the center of the region. A deep source extraction routine, ...

    • New candidate planetary nebulae in the IPHAS survey : The case of planetary nebulae with ISM interaction 

      Sabin, L.; Zijlstra, A.A.; Wareing, C.; Corradi, R.L.M.; Mampaso, A.; Viironen, K.; Wright, N.J.; Parker, Q. A. (2010-01-01)
      We present the results of the search for candidate Planetary Nebulae interacting with the interstellar medium (PNISM) in the framework of the INT Photometric H Survey (IPHAS) and located in the right ascension range 1820 ...

    • Optical photometric GTC/OSIRIS observations of the young massive association Cygnus OB2 

      Guarcello, M.G.; Wright, N.J.; Drake, J.J.; Aldcroft, T.; Kashyap, V.L.; García-Alvarez, D.; Drew, J.E. (2012-10-01)
      In order to fully understand the gravitational collapse of molecular clouds, the star formation process, and the evolution of circumstellar disks, these phenomena must be studied in different Galactic environments with a ...

    • Osiris deep imaging of cygnus OB2 : The stellar population of the cygnus X central engine 

      Guarcello, M.G.; Drake, J.J.; Wright, N.J.; Aldcroft, T.; Fruscione, A.; Kashyap, V.L.; García-Álvarez, D.; Drew, J.E. (2013)
      The young massive cluster Cyg OB2 is the closest massive star forming region to the Sun, with hundreds of OB members, and then the best target in the Milky Way to study the feedback of massive stars on the star formation ...

    • The Spectral and Temporal Properties of Transient Sources in Early-type Galaxies 

      Brassington, Nicola; Fabbiano, G.; Zezas, A.; Kim, D.-W.; Fragos, T.; Kundu, A.; King, A.R.; Pellegrini, S.; Trinchieri, G.; Zepf, S.; Wright, N.J. (2012-08-20)
      We report the spectral and temporal variability properties of 18 candidate transient (TC) and potential transient (PTC) sources detected in deep multi-epoch Chandra observation of the nearby elliptical galaxies, NGC3379, ...

    • Stellar x-ray sources in the chandra cosmos survey 

      Wright, N.J.; Drake, J.J.; Civano, F. (2010-12-10)
      We present an analysis of the X-ray properties of a sample of solar- and late-type field stars identified in the Chandra Cosmic Evolution Survey (COSMOS), a deep (160 ks) and wide (∼0.9 deg ) extragalactic survey. The ...

    • The stellar-activity-rotation relationship and the evolution of stellar dynamos 

      Wright, N.J.; Drake, J.J.; Mamajek, E.E.; Henry, G.W. (2011-12-10)
      We present a sample of 824 solar and late-type stars with X-ray luminosities and rotation periods. This is used to study the relationship between rotation and stellar activity and derive a new estimate of the convective ...

    • The Taiwan-American occultation survey project stellar variability. I : Detection of low-amplitude δ Scuti stars 

      Kim, D. -W.; Protopapas, P.; Alcock, C.; Wright, N.J.; Bianco, F.B.; Lehner, M.J.; Dave, R.; Byun, Y.-I.; Kyeong, J.; Lee, B.-C.; Axelrod, T.; Chen, W.-P.; Lin, H.-C.; Wang, J.-H.; Zhang, Z.-W.; Coehlo, N.K.; Rice, J.A.; Cook, K.H.; Marshall, S.L.; King, S.-K.; Lee, T.; Wang, S.-Y.; Wen, C.-Y.; Porrata, R.; Schwamb, M.E. (2010-01-01)
      We analyzed data accumulated during 2005 and 2006 by the Taiwan-American Occultation Survey (TAOS) in order to detect short-period variable stars (periods of ≲1 hr) such as δ Scuti. TAOS is designed for the detection of ...

    • Ultraviolet-excess sources with a red/infrared counterpart : Low-mass companions, debris discs and QSO selection 

      Verbeek, K.; Groot, Paul J.; Scaringi, Simone; Casares, Jorge; Corral-Santana, Jesus M.; Deacon, Niall; Drew, J.E.; Gänsicke, B.T.; Gonzalez-Solares, E.; Greimel, R.; Heber, U.; Napiwotzki, R.; Ostensen, R.H.; Steeghs, D.; Wright, N.J.; Zijlstra, A. (2014-02)
      We present the result of the cross-matching between ultraviolet (UV)-excess sources selected from the UV-Excess Survey of the Northern Galactic Plane (UVEX) and several infrared (IR) surveys (2MASS, UKIDSS and WISE). From ...