Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454

Details Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454 Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.280..863c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 280, Issue 3, pp. 863-867.

Astronomy and Astrophysics

Astronomy

7

Line: Profiles, Stars: Individual: Zeta Oph, Stars: Individual: Hd 169454, Ism: Molecules

Scientific paper

We have used the Ultra-High-Resolution Facility at the Anglo-Australian Telescope (AAT), operating at a resolution of 0.35 km s^-1 (FWHM), to measure the intrinsic profiles of the Q(2) and Q(4) lines of the (2-0) Phillips band of interstellar C_2 towards zeta Oph and HD 169454. The C_2 lines were found to be very narrow, with intrinsic velocity dispersions (b-values) in the range 0.25-0.71 km s^-1. In the case of zeta Oph, two velocity components (separation 1.10+/-0.17 km s^-1) have been resolved, and found to have rather different linewidths and rotational excitation temperatures. In the case of HD 169454, the data are consistent with a single velocity component, but the well-defined b-value (0.59+/-0.04 km s^-1) and low kinetic temperature would then imply supersonic turbulent velocities. One way to avoid this conclusion is to postulate the existence of unresolved velocity structure (or a velocity gradient) within the cloud.

Affiliated with

Also associated with

No associations

Rating

Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454 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 Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ultra-high-resolution measurements of the intrinsic line profiles of interstellar C_2 towards zeta Ophiuchi and HD 169454 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1301521