The ^12^CH^+^/^13^CH^+^ ratio in the Coalsack.
We have measured the ^12^C/^13^C interstellar ratio in the Coalsack, a prominent dark nebula in the southern sky, by means of high resolution (λ/δλ=6x10^4^) observations of the λ4232A CH^+^ line in the direction of the star HD110432 (d=~0.31kpc). The collection of a total of 53 spectra of this star and of a reference bright star (α Vir) has allowed
Centurion, M. et al.
Fecha de publicación:
10
1995