Spectroscopy of new brown dwarf members of ρ Ophiuchi and an updated initial mass function

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Table 2

Empirical grid of young template spectra.

2MASS designation	Region	Optical SpT	Ref.^a	A_V^b (mag)	(J − H)_2MASS^c	(H − K_s)_2MASS^c	(J − H)_WIRCam^d	(H − K_s)_WIRCam^d

J03442812+3216002	IC348	M3.25	1	2.0	0.69	0.22	0.70	0.20
J04311578+1820072	Taurus	M4.25	2	0.4	0.63	0.26	0.63	0.24
J04183030+2743208	Taurus	M5.5	2	0.6	0.56	0.29	0.54	0.27
J04180796+2826036	Taurus	M6	3, 4, 5	1.6	0.55	0.32	0.50	0.31
J04394748+2601407	Taurus	M7	6, 2	5.4	0.60	0.38	0.55	0.37
J04305718+2556394	Taurus	M8.25	2	0.7	0.66	0.46	0.60	0.45
J04190126+2802487	Taurus	M9	7	1.3	0.74	0.56	0.65	0.55
J01415823 − 4633574	field	L0	8	0.0	1.01	0.65	0.91	0.65
J22081363+2921215	field	L3	8	0.0	1.19	0.78	1.04	0.78
J05012406 − 0010452	field	L4	8	0.0	1.31	0.82	1.12	0.82
J03552337+1133437	field	L5	8	0.0	1.57	1.07	1.42	1.08

Notes.

^(a)

Spectral types from: 1: Luhman et al. (2003b), 2: Briceño et al. (2002), 3: Strom & Strom (1994), 4: Luhman et al. (1998), 5: Briceño et al. (1998), 6: Martín et al. (2001), 7: Luhman et al. (2003a), 8: Cruz et al. (2009).

^(b)

Visual extinction determined from the J − H vs. H − K_s diagram, except for the field L dwarfs.

^(c)

Colours computed from the dereddened spectra in the 2MASS photometric system.

^(d)

Colours computed from the dereddened spectra in the WIRCam/CFHT Vega system.

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