EDP Sciences logo
Subscriber Authentication Point
Search
Menu
Home All issues Volume 569 (September 2014) A&A, 569 (2014) A19 Full HTML
Free Access

Table 4

Model parameters.

Model A Model B Model C Model D
Parameter
T k Temperature 50 K 50 K 50 K 50 K
n H H density 2 × 106 cm-3 3 × 105 cm-3 2 × 106 cm-3 3 × 105 cm-3
He/H Helium abundance 0.1 0.1 0.1 0.1
O/H Oxygen abundance 1.8 × 10-4 1.8 × 10-4 3.3 × 10-4 3.3 × 10-4
C/H Carbon abundance 7.3 × 10-5 7.3 × 10-5 1.3 × 10-4 1.3 × 10-4
N/H Nitrogen abundance 2.1 × 10-5 2.1 × 10-5 7.5 × 10-5 7.5 × 10-5
S/H Sulfur abundance 8 × 10-8 8 × 10-8 1.8 × 10-5 1.8 × 10-5
Fe/H Iron abundance 2 × 10-8 2 × 10-8 2 × 10-8 2 × 10-8
D/H Deuterium fraction 1.5 × 10-5 1.5 × 10-5 1.5 × 10-5 1.5 × 10-5
ortho/para ratio OPR 1 × 10-2 1 × 10-2 1 × 10-2 1 × 10-2
ζ Cosmic ray ionization rate 5 × 10-17 s-1 5 × 10-17 s-1 5 × 10-17 s-1 5 × 10-17 s-1
Model E Model F
Parameter Phase 1 Phase 2a Phase 1 Phase 2b
T k Temperature 15 K 50 K 15 K 50 K
n H H density 2 × 106 cm-3 2 × 106 cm-3 2 × 106 cm-3 2 × 106 cm-3
He/H Helium abundance 0.1 ... 0.1 ...
O/H Oxygen abundance 1.8 × 10-4 ... 1.8 × 10-4 ...
C/H Carbon abundance 7.3 × 10-5 ... 7.3 × 10-5 ...
N/H Nitrogen abundance 7.5 × 10-5 ... 7.5 × 10-5 ...
S/H Sulfur abundance 2.1 × 10-5 ... 2.1 × 10-5 ...
Fe/H Iron abundance 8 × 10-8 ... 8 × 10-8 ...
D/H Deuterium fraction 2 × 10-8 ... 2 × 10-8 ...
ortho/para ratio OPR 1 × 10-4 1 × 10-2 1 × 10-4 1 × 10-2
ζ Cosmic ray ionization rate 5 × 10-17 s-1 5 × 10-17 s-1 5 × 10-17 s-1 5 × 10-17 s-1

Notes.

(a)

Initial abundances of phase 2 were taken from phase 1 at a time of 105 yr.

(b)

Initial abundances of phase 2 were taken from phase 1 at a time of 106 yr.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.