1,721,375 research outputs found
The population of ultracompact binaries and their progenitors
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141553.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 16 juli 2015Promotor : Groot, P.J.198 p
Spiral density waves in the accretion discs of compact binaries
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214489.pdf (Publisher’s version ) (Open Access)Radboud University, 22 november 2019Promotor : Groot, P.J. Co-promotor : Steeghs, D.T.H.IV, 177 p
The evolution of close binaries with white dwarf components
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112934.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 07 oktober 2013Promotores : Nelemans, G.A., Groot, P.J.234 p
Tales told by Galaxies: Clues to chemical enrichment and the Epoch of Reionization
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192452.pdf (Publisher’s version ) (Open Access)Radboud University, 22 juni 2018Promotores : Groot, P.J., Trager, S.C. Co-promotor : Larsen, S.S.iv, 247 p
Mass entrainment and cosmic-ray energisation in Centaurus A
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147138.pdf (Publisher’s version ) (Open Access)Radboud Universiteit Nijmegen, 03 december 2015Promotor : Groot, P.J. Co-promotor : Horandel, J.I, 184 p
Exploring rapid variability of accreting compact sources
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194866.pdf (Publisher’s version ) (Open Access)Radboud University, 07 september 2018Promotor : Groot, P.J. Co-promotor : Körding, E.G.iv, 204 p
Face-on accretion onto protoplanetary discs
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175790.pdf (Publisher’s version ) (Open Access)Radboud University, 05 oktober 2017Promotores : Portegies Zwart, S., Groot, P.J. Co-promotor : Pols, O.R.IV, 191 p
Multi-wavelength accretion studies of cataclysmic variable stars
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159310.pdf (Publisher’s version ) (Open Access)RU Radboud Universiteit, 03 oktober 2016Promotores : Groot, P.J., Woudt, P.A. Co-promotor : Körding, E.G.iii, 148 p
Evolved stars in galactic plane surveys
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115711.pdf (Publisher’s version ) (Open Access)For the first time in history the entire Galactic Plane is digitally mapped from La Palma and Chile by the European Galactic Plane surveys EGAPS (UVEX, IPHAS and VPHAS+, see http://www.uvexsurvey.org http://www.iphas.org and http://www.vphasplus.org).
The complete Galactic plane (3600 square degrees) is imaged in optical colours (U,g,r,i,Halpha and HeI5875) down to 21st magnitude using the INT and VST telescopes. This will eventually result into a multi-colour mosaic and a catalogue with more than a billion of stars.
In this thesis the populations of evolved stars (white dwarfs, compact binaries and other UV-excess sources) in the data of the "UV-Excess Survey of the Northern Galactic Plane (UVEX)" are studied. From the first 211 square degrees of UVEX data, the bluest stars are automatically selected as UV-excess sources, spectroscopic follow-up of UV-excess objects is obtained, a DA white dwarfs space number density and birth rate is derived, and UV-excess sources with an infrared-excess are investigated. (see also Verbeek et al., 2012; Verbeek et al., 2013; Groot et al., 2009)Radboud Universiteit Nijmegen, 11 september 2013Promotor : Groot, P.J.254 p
The IPHAS catalogue of H alpha emission-line sources in the northern Galactic plane
Full text linkWe present a catalogue of point-source H alpha emission-line objects selected from the INT/WFC Photometric Ha Survey (IPHAS) of the northern Galactic plane. The catalogue covers the magnitude range 13 <= r' <= 19.5 and includes Northern hemisphere sources in the Galactic latitude range -5 degrees < b < 5 degrees. It is derived from similar to 1500 deg(2) worth of imaging data, which represents 80 per cent of the final IPHAS survey area. The electronic version of the catalogue will be updated once the full survey data become available. In total, the present catalogue contains 4853 point sources that exhibit strong photometric evidence for Ha emission. We have so far analysed spectra for similar to 300 of these sources, confirming more than 95 per cent of them as genuine emission-line stars. A wide range of stellar populations are represented in the catalogue, including early-type emission-line stars, active late-type stars, interacting binaries, young stellar objects and compact nebulae.
The spatial distribution of catalogue objects shows overdensities near sites of recent or current star formation, as well as possible evidence for the warp of the Galactic plane. Photometrically, the incidence of Ha emission is bimodally distributed in (r' - i'). The blue peak is made up mostly of early-type emission-line stars, whereas the red peak may signal an increasing contribution from other objects, such as young/active low-mass stars. We have cross-matched our H alpha-excess catalogue against the emission-line star catalogue of Kohoutek & Wehmeyer, as well as against sources in SIMBAD. We find that fewer than 10 per cent of our sources can be matched to known objects of any type. Thus IPHAS is uncovering an order of magnitude more faint (r' > 13) emission-line objects than were previously known in the Milky Way
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