Browsing by Subject "binaries: eclipsing"

Now showing 1 - 3 of 3
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    Discovery of an eclipsing dwarf nova in the ancient nova shell Te 11
    (2016) Miszalski, Brent; Woudt, P A; Littlefair, S P; Warner, B; Boffin, H M J; Corradi, R L M; Jones, D; Motsoaledi, M; Rodríguez-Gil, P; Sabin, L; Santander-García, M
    We report on the discovery of an eclipsing dwarf nova (DN) inside the peculiar, bilobed nebula Te 11. Modelling of high-speed photometry of the eclipse finds the accreting white dwarf to have a mass 1.18 M
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    Open Access
    Multi-epoch VLTI-PIONIER imaging of the supergiant V766 Cen: Image of the close companion in front of the primary
    (2017) Wittkowski, M; Abellán, F J; Arroyo-Torres, B; Chiavassa, A; Guirado, J C; Marcaide, J M; Alberdi, A; de Wit, W J; Hofmann, K-H; Meilland, A; Millour, F; Mohamed, S; Sanchez-Bermudez, J
    Context. The star V766 Cen (=HR 5171A) was originally classified as a yellow hypergiant but lately found to more likely be a 27−36 M⊙ red supergiant (RSG). Recent observations indicated a close eclipsing companion in the contact or common-envelope phase.
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    Open Access
    Obscuration effects in super-soft-source X-ray spectra
    (2013) Ness, J-U; Osborne, J P; Henze, M; Dobrotka, A; Drake, J J; Ribeiro, V A R M; Starrfield, S; Kuulkers, E; Behar, E; Hernanz, M; Schwarz, G; Page, K L; Beardmore, A P; Bode, M F
    Context. Super-soft-source (SSS) X-ray spectra are blackbody-like spectra with effective temperatures ~3−7 × 105 K and luminosities of 1035−38 erg s-1. Grating spectra of SSS and novae in outburst that show SSS type spectra display atmospheric absorption lines. Radiation transport atmosphere models can be used to derive physical parameters. Blue-shifted absorption lines suggest that hydrostatic equilibrium is an insufficient assumption, and more sophisticated models are required.