SIMBAD references

1998A&A...338L...1W - Astronomy and Astrophysics, volume 338, L1-4 (1998/10-1)

ORFEUS II echelle spectra: The scale height of interstellar OVI in the halo.

WIDMANN H., DE BOER K.S., RICHTER P., KRAEMER G., APPENZELLER I., BARNSTEDT J., GOELZ M., GREWING M., GRINGEL W., MANDEL H. and WERNER K.

Abstract (from CDS):

FUV high resolution spectra of 18 stars, particularly chosen to observe the interstellar medium (ISM), were obtained during the second ORFEUS-SPAS free flight space shuttle mission in December 1996. Among these were 6 objects with a distance to the galactic plane larger than 1kpc, one SMC and 4 LMC stars. This selction of targets is part of the ORFEUS program to explore the galactic halo. As the most important tracer of the hot gas we analyzed the stronger component of the important OVI doublet in all our ISM spectra. We found an average N(OVI)xsin|b| of ∼3.5x1014cm–2 on the lines of sight to the 4 LMC stars. Assuming an exponential distribution of Ovi we calculated a midplane density n0 of 2.07+0.26–0.24x10–8cm–3 and a scale height h0 of 5.50+2.37–2.09kpc.

Abstract Copyright:

Journal keyword(s): space vehicles - ISM: general - ISM: structure - Galaxy: halo - Galaxy: structure - ultraviolet: ISM

Simbad objects: 17

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