Near-infrared low-resolution spectroscopy of Pleiades L-type brown dwarfs

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Table 1:

Spectroscopic observations.
Object	J^b	Opt.	Instrument	Date	$T_{\rm exp}$ ^d	Airmass	$\Delta$ airmass $_{\rm T-S}$	S/N	Near-IR
	(mag)	SpT^c			(min)				SpT
PPl 1	15.36 $\pm$ 0.01	M6.5	NICS(JHK)	2002 Oct. 31	8 $\times$ 2	1.08	0.14	50	M7.0 $\pm$ 0.5
Calar 3	16.08 $\pm$ 0.01	M8	NICS(JHK)	2002 Oct. 31	8 $\times$ 2	1.15	0.07	49	M8.0 $\pm$ 0.5
Teide 1	16.21 $\pm$ 0.01	M8	NICS(JHK)	2002 Nov. 27	8 $\times$ 2	1.03	0.73	32	M8.0 $\pm$ 0.5
BRB 17	17.41 $\pm$ 0.03	...	LIRIS(zJ,HK)	2006 Dec. 28	(12, 18) $\times$ 2	1.74, 1.41	0.44, 0.89	4, 6	L0.0 $\pm$ 1.0
PLIZ 28	17.60 $\pm$ 0.04	...	NICS(JHK)	2005 Nov. 20	15 $\times$ 2	1.11	0.57	18	L0.0 $\pm$ 1.0
PLIZ 35	18.07 $\pm$ 0.05	...	NICS(JHK)	2005 Sep. 18	65 $\times$ 0.6	1.03	-0.03	15	L2.0 $\pm$ 1.0
BRB 21	18.14 $\pm$ 0.06	...	NICS(JHK)	2005 Sep. 18	80 $\times$ 0.5	1.21	0.15	7	L3.0 $\pm$ 1.0
BRB 23	18.23 $\pm$ 0.04	...	NICS(JHK)	2007 Feb. 7	10 $\times$ 5	1.33	-0.27	14	L3.5 $\pm$ 1.0
BRB 29	18.69 $\pm$ 0.10	...	LIRIS(HK)	2006 Dec. 29	12 $\times$ 2	1.09	-0.02	3	L4.5 $\pm$ 1.5
J0829^a	12.80 $\pm$ 0.03	L2V	LIRIS(zJ,HK)	2006 Dec. 28	(4, 6) $\times$ 1.5	1.38, 1.36	0.80, 0.94	29, 37	L2.0 $\pm$ 1.0

Notes. ^(a) SSSPM J0829-1309. ^(b) From the Galactic Clusters Survey (GCS) component of UKIDSS (Lawrence et al. 2007, sixth data release) for the Pleiades members and from 2MASS (Skrutskie et al. 2006) for the field object. ^(c) From Martín et al. (1996) for the three Pleiades objects and from Scholz & Meusinger (2002) and Lodieu et al. (2005) for the field object. ^(d) Dithers $\times$ detector integration time.

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