Spectral characterization of young LT dwarfs | Astronomy & Astrophysics (A&A)

Home

All issues

Volume 686 (June 2024)

A&A, 686 (2024) A37

Full HTML

Open Access

Table D.2

Gravity-sensitive spectral indices inspected.

Index	Reference	Formula	Feature Measured
FeH_J	(1)	$(\frac{λ_{1.200 -} λ_{1.192}}{λ_{1.208 -} λ_{1.192}} F_{1.208} + \frac{λ_{1.208 -} λ_{1.200}}{λ_{1.208 -} λ_{1.192}} F_{1.192}) / F_{1.200}$ $\left( {{{{\lambda _{1.200 - }}{\lambda _{1.192}}} \over {{\lambda _{1.208 - }}{\lambda _{1.192}}}}{F_{1.208}} + {{{\lambda _{1.208 - }}{\lambda _{1.200}}} \over {{\lambda _{1.208 - }}{\lambda _{1.192}}}}{F_{1.192}}} \right)/{F_{1.200}}$	1.2 μm FeH absorption
KI_J	(1)	$(\frac{λ_{1.244 -} λ_{1.220}}{λ_{1.270 -} λ_{1.220}} F_{1.270} + \frac{λ_{1.270 -} λ_{1.244}}{λ_{1.270 -} λ_{1.220}} F_{1.220}) / F_{1.244}$ $\left( {{{{\lambda _{1.244 - }}{\lambda _{1.220}}} \over {{\lambda _{1.270 - }}{\lambda _{1.220}}}}{F_{1.270}} + {{{\lambda _{1.270 - }}{\lambda _{1.244}}} \over {{\lambda _{1.270 - }}{\lambda _{1.220}}}}{F_{1.220}}} \right)/{F_{1.2444}}$	1.244, 1.253 μm KI doublet
H-cont	(1)	$(\frac{λ_{1.560 -} λ_{1.470}}{λ_{1.670 -} λ_{1.470}} F_{1.670} + \frac{λ_{1.670 -} λ_{1.560}}{λ_{1.670 -} λ_{1.470}} F_{1.470}) / F_{1.560}$ $\left( {{{{\lambda _{1.560 - }}{\lambda _{1.470}}} \over {{\lambda _{1.670 - }}{\lambda _{1.470}}}}{F_{1.670}} + {{{\lambda _{1.670 - }}{\lambda _{1.560}}} \over {{\lambda _{1.670 - }}{\lambda _{1.470}}}}{F_{1.470}}} \right)/{F_{1.560}}$	H-band shape
VO_z	(1)	$(\frac{λ_{1.058 -} λ_{1.035}}{λ_{1.087 -} λ_{1.035}} F_{1.087} + \frac{λ_{1.087 -} λ_{1.058}}{λ_{1.087 -} λ_{1.035}} F_{1.035}) / F_{1.058}$ $\left( {{{{\lambda _{1.058 - }}{\lambda _{1.035}}} \over {{\lambda _{1.087 - }}{\lambda _{1.035}}}}{F_{1.087}} + {{{\lambda _{1.087 - }}{\lambda _{1.058}}} \over {{\lambda _{1.087 - }}{\lambda _{1.035}}}}{F_{1.035}}} \right)/{F_{1.058}}$	1.06 μm VO absorption
TLI-g	(2)	$\frac{〈 F_{λ = 1.56 - 1.58} 〉}{〈 F_{λ = 1.625 - 1.635} 〉}$ ${{\left\langle {{F_{\lambda = 1.56 - 1.58}}} \right\rangle } \over {\left\langle {{F_{\lambda = 1.625 - 1.635}}} \right\rangle }}$	1.5-1.565 μm H₂O absorption
H₂(K)	(3)	$\frac{〈 F_{λ = 2.16 - 2.18} 〉}{〈 F_{λ = 2.23 - 2.25} 〉}$ ${{\left\langle {{F_{\lambda = 2.16 - 2.18}}} \right\rangle } \over {\left\langle {{F_{\lambda = 2.23 - 2.25}}} \right\rangle }}$	K-band peak
HPI	(4)	$\frac{〈 F_{λ = 1.675 - 1.685} 〉}{〈 F_{λ = 1.495 - 1.505} 〉}$ ${{\left\langle {{F_{\lambda = 1.675 - 1.685}}} \right\rangle } \over {\left\langle {{F_{\lambda = 1.495 - 1.505}}} \right\rangle }}$	H-band peak for young objects

Notes. (1) Allers & Liu (2013); (2) Almendros-Abad et al. (2022); (3) Canty et al. (2013); (4) Scholz et al. (2012)

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.