Free Access
Table 2
Classification criteria for the SC spectral types, reproduced from Keenan & Boeshaar (1980).
| Spectral type | Criteria for C/O | Estimated |
| C/O | ||
|
|
||
| SX/7 = SC X/7 | ZrO weaker. D lines strong. | 0.99 |
| SC X/8 | No ZrO or C2. D lines very strong. | 1.00 |
| SC X/9 | C2 very weak. D lines very strong. | 1.02 |
| SC X/10 = C X,2 | C2 weak. D lines strong. | 1.1: |
Notes. X denotes the temperature type; D lines are Na D lines.
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.