Bibcode
Verbeek, Kars; Groot, Paul J.; Scaringi, Simone; Napiwotzki, Ralf; Spikings, Ben; Østensen, Roy H.; Drew, Janet E.; Steeghs, Danny; Casares, J.; Corral-Santana, J. M.; Corradi, R. L. M.; Deacon, Niall; Drake, Jeremy J.; Gänsicke, Boris T.; González-Solares, Eduardo; Greimel, Robert; Heber, Ulrich; Irwin, Mike J.; Knigge, Christian; Nelemans, Gijs
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 426, Issue 2, pp. 1235-1261.
Advertised on:
10
2012
Citations
17
Refereed citations
14
Description
We present the results of the first spectroscopic follow-up of 132
optically blue ultraviolet (UV)-excess sources selected from the
UV-Excess Survey of the Northern Galactic Plane (UVEX). The UV-excess
spectra are classified into different populations and grids of model
spectra are fitted to determine spectral types, temperatures, surface
gravities and reddening. From this initial spectroscopic follow-up 95
per cent of the UV-excess candidates turn out to be genuine UV-excess
sources such as white dwarfs, white dwarf binaries, subdwarf types O and
B, emission-line stars and quasi stellar objects. The remaining sources
are classified as slightly reddened main-sequence stars with spectral
types later than A0V. The fraction of DA white dwarfs is 47 per cent
with reddening smaller than E(B ‑ V) ≤ 0.7 mag. Relations
between the different populations and their UVEX photometry, Galactic
latitude and reddening are shown. A larger fraction of UVEX white dwarfs
is found at magnitudes fainter than g > 17 and Galactic latitude
smaller than |b| < 4 compared to main-sequence stars, blue horizontal
branch stars and subdwarfs.
Related projects
![Space Telescope (HST) image of the planetary Nebula "The Necklace" discovered in 2005 by our group during the IPHAS H-alpha mapping of the Galactic Plane (Isaac Newton Telescope at Roque de los Muchachos Observatory). This Planetary became a key object for understanding the formation of bipolar nebulae from binary progenitor stars (Corradi+2011). Planetary Nebula "The Necklace"](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/Imagen%20AMR.jpg?itok=S55dQ216)
Bipolar Nebulae
This project has three major objectives: 1) To determine the physico-chemical characteristics of bipolar planetary nebulae and symbiotic nebulae, to help understanding the origin of bipolarity and to test theoretical models, mainly models with binary central stars, aimed at explaining the observed morphology and kinematics. 2) To study the low
Antonio
Mampaso Recio
![The illustration is inspired in the system V404 Cygni, and represents both the companion star and the accretion disc surrounding the black hole, as well as ejection processes in the form of a jet and wind. Black hole in outburst](/sites/default/files/styles/crop_square_2_2_to_320px/public/images/project/%C3%87Imagen%20TMD.jpg?h=25367c22&itok=0HYcf1S9)
Black holes, neutron stars, white dwarfs and their local environment
Accreting black-holes and neutron stars in X-ray binaries provide an ideal laboratory for exploring the physics of compact objects, yielding not only confirmation of the existence of stellar mass black holes via dynamical mass measurements, but also the best opportunity for probing high-gravity environments and the physics of accretion; the most
Montserrat
Armas Padilla