We report the discovery of two hot white dwarfs which have the lowest line-of-sight neutral hydrogen column densities yet measured. The stars were found independently by the ROSAT EUV, Montreal-Cambridge-Tololo, and Edinburgh-Cape surveys. Follow-up observations made using the Voyager 2 ultraviolet spectrometer reveal strong continua shortward of the 912A Lyman limit from which we deduce that the neutral hydrogen column densities are 1.3 x 10(exp 17) and 2.0 x 10(exp 17) atoms/sq cm.


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    Title :

    Two new hot white dwarfs in a region of exceptionally low hi density


    Contributors:
    Barstow, M. A. (author) / Wesemael, F. (author) / Holberg, J. B. (author) / Werner, K. (author) / Buckley, D. A. H. (author) / Stobie, R. S. (author) / Fontaine, G. (author) / Rosen, S. R. (author) / Demers, S. (author) / Lamontagne, R. (author)

    Published in:

    Publication date :

    1993-12-01



    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :


    Two New Hot White Dwarfs in a Region of Exceptionally Low HI Density

    Barstow, M. A. / Wesemael, F. / Holberg, J. B. et al. | British Library Conference Proceedings | 1993



    Two new hot white dwarfs in a region of exceptionally low hi density

    Barstow, M.A. / Wesemael, F. / Holberg, J.B. et al. | Elsevier | 1993


    White dwarfs

    Barstow, M.A. | Elsevier | 1991


    White Dwarfs Observed by Hipparcos

    Vauclair, G. / Schmidt, H. / Koester, D. et al. | British Library Online Contents | 1997