A new determination of the local distribution of interstellar NaI

Details A new determination of the local distribution of interstellar NaI A new determination of the local distribution of interstellar NaI

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..101w&link_type=abstract

Astronomy and Astrophysics, v.333, p.101-105 (1998)

Astronomy and Astrophysics

Astrophysics

35

Ism: Clouds, Ism: Atoms, Solar Neighbourhood

Scientific paper

We present galactic maps of the distribution of neutral sodium absorption column density using the newly determined Hipparcos satellite distances for a total of 290 stars lying within 250pc of the Sun. These maps now replace those originally presented in Welsh {et al./} (1994). The Local Bubble is now seen to be a neutral gas-free cavity (nH < 0.01 cm(-3) ) with a radius of at least 70pc in most directions, more than 50% larger in volume than previously determined from NaI absorption data. Additionally, the well-known low-density interstellar tunnel in the direction of the star beta CMa is almost twice as wide as previously thought, and the existence of a similarly tenuous interstellar feature has been identified in the galactic direction of Lupus-Norma extending to at least 170pc. Finally, we note the absence of dense neutral gas out to a distance of at least 100pc in the direction of galactic longitude {lII} = 135(deg) .

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