The EUV source population and the local bubble

Details The EUV source population and the local bubble The EUV source population and the local bubble

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.262..289w&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 262, no. 2, p. 289-300.

Astronomy and Astrophysics

Astronomy

49

Bubbles, Extreme Ultraviolet Radiation, Interstellar Gas, Late Stars, Radiation Sources, Ultraviolet Astronomy, White Dwarf Stars, F Stars, G Stars, Sky Surveys (Astronomy), Ultraviolet Absorption

Scientific paper

A catalog of 384 relatively bright sources detected in the first-ever all-sky survey in the EUV, carried out by the UK Wide Field Camera on ROSAT, has recently been published. We have made a detailed study of the differential source counts of the two classes of source that dominate the WFC bright source catalog, namely white dwarf stars and active late-type stars. The counts of white dwarf stars, in particular, give evidence of very strong absorption. The global source counts can be best explained in terms of a bubble model in which a local low-density region is bounded by higher density gas. Observational data are consistent with an interior gas density of about 0.05 atoms/cu cm, an average bubble radius of about 80 pc, and at least a five-fold increase in the gas density at the bubble boundary. We have also investigated the spatial distribution of the WFC sources, so as to identify regions where the EUV transmission of the local ISM differs signfficantly from the global average value.

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