The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy.

Details The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy. The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy.

Feb 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...317..889c&link_type=abstract

Astronomy and Astrophysics, v.317, p.889-897

Astronomy and Astrophysics

Astrophysics

19

Ism: Clouds, Ism: Kinematics And Dynamics, Ism: Structure, Ism: Atoms

Scientific paper

We present ultra-high-resolution (0.35km/s FWHM) observations of the interstellar Ca K line towards eight nearby stars (six of which are closer than 30pc). The spectral resolution is sufficient to resolve the line profiles fully, thereby enabling us to detect hitherto unresolved velocity components, and to obtain accurate measurements of the velocity dispersions (b-values). Absorption components due to the Local Interstellar Cloud (LIC) and/or the closely associated `G Cloud' are identified towards all but one star (γ Oph), but only in one case (51 Oph) are both clouds reliably detected towards the same star. Most of these nearby clouds have velocity dispersions (b=~2km/s) which suggest physical conditions similar to those inferred for the LIC (T_k_=~7000K, v_t_=~1km/s), although at least three lines of sight (towards γ Aqr, β Cen and ρ Cen) also sample cooler and/or less turbulent material. The spectrum of the nearby Vega-excess star 51 Oph is of particular interest, owing to evidence that several of the absorption components arise in the circumstellar environment.

Affiliated with

Also associated with

No associations

Rating

The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy. does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The velocity structure of the local interstellar medium probed by ultra-high-resolution spectroscopy. will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1771705