Characterization of the known T-type dwarfs towards the σ Orionis cluster

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Table 3

Proper motion and spectral types of S Ori objects.

Object	Δ(t)	μ_αcosδ	μ _δ	SpT^a	SpT^b
	(yr)	(mas yr^-1)	(mas yr^-1)	(color)	(spec)

S Ori 70	8.68	19.8 ± 5.9	33.7 ± 6.2	T6.6–T7.2	T7.0 ^+0.5_-1.0
S Ori 73	8.82	43.6 ± 6.7	−3.6 ± 7.7	T3.2–T5.4	T4.5 ± 0.5
S Ori J053804.65−021352.5	7.03	−1.2 ± 6.1	−4.8 ± 7.5	T4.5–T6.5	T5.0 ± 0.5

Notes.

^(a)

This paper, based on LIRIS methane colors.

^(b)

This paper, based on low-resolution spectra.

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