Navegação Ciências Exatas e da Terra por Assunto "Ultraviolet: stars"

Resultados 1-5 de 5

    • Analysis of IUE spectra of helium-rich white dwarf stars 

      Castanheira, Bárbara Garcia; Kepler, Souza Oliveira; Handler, Gerald; Koester, Detlev (2006) [Artigo de periódico]
      We studied the class of DB white dwarf stars, using re-calibrated UV spectra for thirty four DBs obtained with the IUE satellite. By comparing the observed energy distributions with model atmospheres, we simultaneously ...

    • Hot degenerates in the montreal-cambridge-tololo survey. II. Two new hybrid white dwarfs, MCT 0128-3846 and MCT 0453-2933 and the nature of the dab stars 

      Bergeron, Pierre; Lamontagne, R.; Fontaine, Gilles; Beauchamp, A.; Demers, Serge; Irwin, Michael John; Holberg, J.B.; Vennes, S.; Kepler, Souza Oliveira; Wesemael, F. (1994) [Artigo de periódico]
      We report the discovery, in the course of a survey for high-latitude, ultraviolet-excess objects in the southern hemisphere, of two new hybrid DAB stars. Both objects exhibit a weak He I λ4471 line superposed onto the usual ...

    • A new hot DA white dwarf in a region of exceptionally low HI density 

      Barstow, Martin A.; Wesemael, F.; Holberg, J.B.; Buckley, David A.H.; Stobie, Robert S.; Mittaz, J.P.D.; Fontaine, Gilles; Rosen, Simon R.; Demers, Serge; Lamontagne, R.; Irwin, Michael John; Bergeron, Pierre; Kepler, Souza Oliveira; Vennes, S. (1994) [Artigo de periódico]
      We report the discovery of the hot DA white dwarf RE 0457- 281 which has the lowest line-of-sight neutral hydrogen column density yet measured. The star was found independently by the ROSAT EUV, Montreal-Cambridge-Tololo ...

    • SN 1992A : ultraviolet and optical studies based on HST, IUE and CTIO observations 

      Kirshner, Robert P.; Jeffery, David J.; Leibundgut, Bruno; Challis, Peter M.; Sonneborn, George; Phillips, M.M.; Suntzeff, N.B.; Smith, Robert Christopher; Winkler, P. Frank; Winge, Claudia; Hamuy, Mario; Hunter, Deidre A.; Roth, Katherine C.; Blades, J.C.; Branch, David; Chevalier, Roger A.; Fransson, Claes; Panagia, Nino; Wagoner, Robert V.; Wheeler, J. Craig; Harkness, Robert P. (1993) [Artigo de periódico]
      The Type Ia supernova SN 1992A in the SO galaxy NGC 1380 was observed as a target of opportunity by the International Ultraviolet Explorer (IUE) and with great alacrity by the Hubble Space Telescope (HST). Here we present ...

    • White dwarf variability with gPhoton : pulsators 

      Tucker, Michael A.; Fleming, S.W.; Pelisoli, Ingrid Domingos; Romero, Alejandra Daniela; Bell, Keaton; Kepler, Souza Oliveira; Caton, Daniel B.; Debes, John; Montgomery, Michael Houston; Thompson, S. E.; Koester, Detlev; Million, Chase; Shiao, Bernie (2018) [Artigo de periódico]
      We present results from a search for short time-scale white dwarf variability using gPhoton, a time-tagged data base of GALEX photon events and associated software package. We conducted a survey of 320 white dwarf stars ...