Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.283.1089k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 283, Issue 3, pp. 1089-1101.
Astronomy and Astrophysics
Astronomy
3
Stars: Distances, Ism: Atoms, Ism: Clouds, Ism: General, Ism: Structure, Ultraviolet: Stars
Scientific paper
Further optical and UV spectral data are presented for four stars in the direction of the Riegel & Crutcher cold cloud. Two of the stars lie close in position to the area covered by our previous optical, UV and radio studies near l=10 deg, while the other two stars lie near l=15 deg. The stars range in distance from about 140 pc to 1.5 kpc. The RC cold cloud gas is detected (at a velocity of ~+3 km s^-1) towards a star at a distance of about 150 pc, in agreement with previous cloud distance estimates. The spectra of the more distant stars contain components at higher velocities; components at +20 and +40 km s^-1 may be identified with peculiar-velocity gas associated with the Sagittarius arm, seen elsewhere in the general field, while a component at -60 km s^-1 may be stellar or interstellar in nature. A component at -20 km s^-1 seen towards previously studied stars in the field is not clearly identified in the spectra of the present stars. The atomic column densities of the Riegel & Crutcher cloud component do not vary greatly across the field, although the CH and CH^+ column densities are more variable. The CH/CH^+ column density ratio remains fairly constant, however, at a value that is consistent with the CH^+ being formed in a warm boundary layer. Along the HD 167264 sightline, the cold gas has an electron density of the order of 0.05-0.1 cm^-3 and a space density of the order of 100-300 cm^-3.
Bates Brandon
Hambly Nigel C.
Kemp Simon N.
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