Free Access
Table A.1.
Spectral type definition along the main sequence.
| ST | Definition |
|---|---|
| Population B: FWHM(Hβ) ≳ 4000 km s−1. Virial-dominated with redward-asymmetric profiles in Hβ and Mg IIλ2800. Also described a disk-dominated (Richards et al. 2011). | |
| B1++ | 12 000 km s−1 ≤ FWHM(Hβ) < 16 000 km s−1, RFeII < 0.5 |
| B1+ | 8000 km s−1 ≤ FWHM(Hβ) < 12 000 km s−1, RFeII < 0.5 |
| B1 | 4000 km s−1 ≤ FWHM(Hβ) < 8000 km s−1, RFeII < 0.5 |
| Population A: FWHM(Hβ) ≲ 4000 km s−1. Sources frequently show C IVλ1549 blueshifts, and Hβ Lorentzian-like profiles (Du et al. 2016). Includes a range of FeII emission. | |
| A1 | FWHM(Hβ) < km s−1; RFeII < 0.5 |
| A2 | FWHM(Hβ) < 4000 km s−1; ≤0.5RFeII < 1 |
| A3 [xA] | FWHM(Hβ) < 4000 km s−1; ≤1RFeII < 1.5 |
| A4 [xA] | FWHM(Hβ) < 4000 km s−1; 1.5 ≤RFeII < 2 |
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.