2018MNRAS.480.5447Z

Query : 2018MNRAS.480.5447Z

2018MNRAS.480.5447Z - Mon. Not. R. Astron. Soc., 480, 5447-5474 (2018/November-2)

Primeval very low-mass stars and brown dwarfs - IV. New L subdwarfs, Gaia astrometry, population properties, and a blue brown dwarf binary.

ZHANG Z.H., GALVEZ-ORTIZ M.C., PINFIELD D.J., BURGASSER A.J., LODIEU N., JONES H.R.A., MARTIN E.L., BURNINGHAM B., HOMEIER D., ALLARD F., ZAPATERO OSORIO M.R., SMITH L.C., SMART R.L., LOPEZ MARTI B., MAROCCO F. and REBOLO R.

Abstract (from CDS):

We present 27 new L subdwarfs and classify five of them as esdL and 22 as sdL. Our L subdwarf candidates were selected with the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Spectroscopic follow-up was carried out primarily with the OSIRIS spectrograph on the Gran Telescopio Canarias. Some of these new objects were followed up with the X-shooter instrument on the Very Large Telescope. We studied the photometric properties of the population of known L subdwarfs using colour-spectral type diagrams and colour-colour diagrams, by comparison with L dwarfs and main sequence stars, and identified new colour spaces for L subdwarf selection/study in current and future surveys. We further discussed the brown dwarf transition-zone and the observational stellar/substellar boundary. We found that about one-third of 66 known L subdwarfs are substellar objects, with two-thirds being very low-mass stars. We also present the Hertzsprung-Russell diagrams, spectral type-absolute magnitude corrections, and tangential velocities of 20 known L subdwarfs observed by the Gaia astrometry satellite. One of our L subdwarf candidates, ULAS J233227.03+123452.0, is a mildly metal-poor spectroscopic binary brown dwarf: a ∼L6p dwarf and a ∼T4p dwarf. This binary is likely a thick disc member according to its kinematics.

Journal keyword(s): binaries: spectroscopic - brown dwarfs - stars: chemically peculiar - stars: Population II - stars: subdwarfs

VizieR on-line data: <Available at CDS (J/MNRAS/480/5447): table1.dat-table7.dat table9.dat>

Simbad objects: 152

Full paper

View the references in ADS

Number of rows : 152

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	2MASS J00144919-0838207	BD*	00 14 49.1134104836	-08 38 20.542837506						sdL0	12	0
2	SDSS J001747.60+130757.2	G	00 17 47.60856	+13 07 57.2772						~	1	0
3	ULAS J001837.37+020015.7	LM*	00 18 37.37568	+02 00 15.7140						M9V	1	0
4	ULAS J001931.33+063111.0	LM*	00 19 31.37242	+06 31 13.3114						M9V	1	0
5	ULAS J002009.34+160451.1	LM*	00 20 09.34392	+16 04 51.1644						sdM9	1	0
6	EGGR 382	PM*	00 33 54.4629362352	-12 07 58.775300904	15.511	15.572	14.891	14.467	14.051	DC?	99	0
7	2MASS J00412179+3547133	BD?	00 41 21.8109482112	+35 47 13.392820392						sdL?	7	0
8	ULAS J004602.85+091131.2	LM*	00 46 02.85120	+09 11 31.2216						M9V	1	0
9	ULAS J004716.65+161242.4	LM*	00 47 16.69826	+16 12 42.4314						M9V	1	0
10	2MASS J00575687+2013075	BD*	00 57 56.872	+20 13 07.54						sdL7	5	1
11	SDSS J010448.46+153501.8	BD*	01 04 48.46968	+15 35 01.8960						usdL1.5	7	0
12	ULAS J010756.85+100811.3	LM*	01 07 56.85912	+10 08 11.3280						sdM7	1	0
13	2MASS J01163865-1654210	LM*	01 16 38.6229630151	-16 54 21.182720882						d/sdM8.5	4	0
14	ULAS J011711.98-005213.4	LM*	01 17 11.95966	-00 52 13.3981						M7V	1	0
15	ULAS J011824.89+034130.4	BD*	01 18 24.89592	+03 41 30.4296						sdL0	2	0
16	ULAS J011840.73+084424.7	BD*	01 18 40.73208	+08 44 24.7380						sdL0	1	0
17	2MASS J01301256-1047285	PM*	01 30 12.5705767208	-10 47 28.872904182						M9	6	0
18	2MASS J01340281+0508125	BD*	01 34 02.7928138056	+05 08 13.061582628						L1	5	0
19	2MASS J01415823-4633574	BD*	01 41 58.2329929560	-46 33 57.347594316						L0gamma	67	0
20	2MASS J02020138-3136318	PM*	02 02 01.3875470943	-31 36 32.892156482						~	7	0
21	ULAS J020628.22+020255.6	LM*	02 06 28.22304	+02 02 55.6404						sdM7	1	0
22	2MASS J02081833+2542533	BD*	02 08 18.3864053730	+25 42 53.199852759						L1V	42	0
23	ULAS J020858.62+020657.0	BD*	02 08 58.62192	+02 06 57.0960						esdL3	5	0
24	SDSS J021258.07+064117.5	BD*	02 12 58.07112	+06 41 17.5632						sdL0.5	5	0
25	SDSS J021642.98+004005.9	BD*	02 16 42.98472	+00 40 05.9952						sdL4	5	0
26	2MASSI J0228110+253738	BD*	02 28 11.01312	+25 37 38.0136						L0	22	0
27	ULAS J023803.12+054526.1	BD*	02 38 03.04584	+05 45 27.3456						sdL0	2	0
28	ULAS J024035.36+060629.3	LM*	02 40 35.41833	+06 06 29.9108						sdM7	1	0
29	DENIS J025503.3-470049	BD*	02 55 03.6927058871	-47 00 51.356903955			22.921	19.906	17.454	L9	140	0
30	2MASS J03060140-0330438	PM*	03 06 01.4335104089	-03 30 45.460705468						~	8	0
31	ULAS J033350.84+001406.1	BD*	03 33 50.7462270574	+00 14 06.208902954						sdL0.0	8	0
32	HD 22686	*	03 38 55.0926835176	+02 45 48.585043080		7.24	7.22			A0/1V	49	0
33	Cl* Melotte 22 KPNO 2	BD*	03 45 43.1616128256	+25 40 23.239779672					17.36	L0V	122	0
34	2MASS J03554191+2257016	BD*	03 55 41.91504	+22 57 01.6776						L3V	19	0
35	2MASS J04353511+2115201	BD*	04 35 35.1905356016	+21 15 18.934401687						sdL0	11	0
36	BD+52 913	WD*	05 05 30.6180977592	+52 49 51.919301604	10.25	11.44	11.69	11.93	12.108	DA.8	1070	0
37	2MASS J05233822-1403022	BD*	05 23 38.2236232872	-14 03 02.017758240						L2.5	62	0
38	2MASS J05325346+8246465	BD*	05 32 54.4345118405	+82 46 45.161005926						esdL7	60	0
39	SIPS J0539-0059	BD*	05 39 52.0040375405	-00 59 01.491092352						L5V	85	0
40	2MASS J06164006-6407194	BD*	06 16 40.06	-64 07 19.5						sdL5	17	0
41	HD 289002	*	06 45 13.3725491952	+02 08 14.685250596	10.06	10.62	10.44			B1	254	0
42	2MASS J06453153-6646120	BD*	06 45 31.53216	-66 46 12.0432						sdL8	6	0
43	2MASS J07533526+2006243	BD*	07 53 35.2613587695	+20 06 23.975754806						sdL0	2	0
44	HD 64745	*	07 55 47.6441544552	+10 26 36.408998688		6.98	7.01			B9V	15	0
45	2MASS J07584037+3247245	BD*	07 58 40.3517739525	+32 47 23.984796389						T0.0+T3.5	44	0
46	2MASS J08220659+0441026	BD*	08 22 06.59448	+04 41 02.6556						sdL0.5	2	0
47	2MASS J08234818+2428577	BD*	08 23 48.1764872088	+24 28 57.747267336						L2	16	0
48	2MASS J08350622+1953050	BD*	08 35 06.22944	+19 53 05.0532						L5	37	0
49	2MASS J08354256-0819237	BD*	08 35 42.5314423948	-08 19 23.372129099						L6.5	65	0
50	2MASS J08503593+1057156	BD*	08 50 35.93400	+10 57 15.6168				22.466	20.349	L6.5+L8.5	78	0
51	HD 77281	*	09 01 38.0090336520	-01 28 34.767080940		7.49	7.35			A3IV	41	0
52	2MASS J10101480-0406499	BD*	10 10 14.80704	-04 06 49.9320						L6	56	0
53	SSSPM J1013-1356	LM*	10 13 07.3464466893	-13 56 21.261502194				18.73	16.01	sdM9.5	40	1
54	2MASS J10133048-7246231	BD*	10 13 30.485	-72 46 23.11						sdL2?	6	0
55	2MASS J10170754+1308398	BD*	10 17 07.5535371936	+13 08 39.784300548					17.418	L1.5+L3	31	0
56	2MASSW J1036530-344138	BD*	10 36 53.0605368096	-34 41 38.377435973						L6	20	0
57	LSPM J1048+0111	BD*	10 48 42.8144208091	+01 11 58.221081965				19.4		L1	54	0
58	2MASS J11040127+1959217	BD*	11 04 01.2774943824	+19 59 21.714139176						L4	39	0
59	ULAS J111429.54+072809.5	BD*	11 14 29.54040	+07 28 09.5052						esdL0	3	0
60	GD 140	WD*	11 37 05.1041466528	+29 47 58.288741080	11.47	12.42	12.45	12.73	12.714	DA2.2	235	0
61	2MASS J11463449+2230527	BD*	11 46 34.5341033040	+22 30 54.036482400						L3+L4	87	0
62	2MASS J11550087+2307058	BD*	11 55 00.8851003272	+23 07 06.421018152						L4V	23	0
63	2MASS J11582077+0435014	BD*	11 58 20.7331430107	+04 35 02.400141131						sdL7	18	0
64	2MASS J12212770+0257198	BD*	12 21 27.7124211648	+02 57 19.767907440						L0.5	39	0
65	ULAS J123142.99+015045.4	BD*	12 31 43.09640	+01 50 45.3136						sdL0	2	0
66	HD 109195	*	12 33 12.1871532408	-52 04 58.236967812		6.52	6.55			B9.5V	26	0
67	ULAS J124104.75-000531.4	BD*	12 41 04.75104	-00 05 31.4520						sdL0	2	0
68	ULAS J124410.06+273624.7	BD*	12 44 10.10832	+27 36 25.8408						sdL0.0	4	0
69	2MASS J12442595+1024432	BD*	12 44 25.9690664151	+10 24 43.179211214						sdL0.5	8	0
70	SDSS J124947.11+095020.6	BD*	12 49 46.9130668804	+09 50 17.714627072						sdL1	3	0
71	ULAS J125226.62+092920.1	BD*	12 52 26.62728	+09 29 20.1120						sdL0.5	2	0
72	2MASS J12563716-0224522	BD*	12 56 37.1377931858	-02 24 52.266257764						esdL3.5	38	0
73	2MASS J12564352-6202041	BD*	12 56 43.5338984151	-62 02 04.301972270						L	6	0
74	GD 153	WD*	12 57 02.3224909560	+22 01 52.634778240	11.883	13.060	13.349	13.488	13.669	DA1.2	347	0
75	2MASS J12593878+3015003	LM*	12 59 38.7387111658	+30 15 00.172543886						M9V	3	0
76	ULAS J130710.22+151103.4	BD*	13 07 10.22040	+15 11 03.4908						sdL8	2	0
77	2MASS J13313310+3407583	BD*	13 31 33.1077877455	+34 07 58.212760199						L1	20	0
78	2MASS J13314894-0116500	BD*	13 31 48.9202570553	-01 16 51.118063680						L6V	39	0
79	2MASS J13334822+2735115	BD*	13 33 48.24192	+27 35 08.8908						sdL0	10	0
80	SDSS J133837.01-022908.4	BD*	13 38 37.01088	-02 29 08.4480						sdL7	7	0
81	ULAS J134206.86+053724.9	BD*	13 42 06.91446	+05 37 26.8083						sdL1	2	0
82	ULAS J134423.98+280603.8	BD*	13 44 23.98560	+28 06 03.8628						sdL4	3	0
83	ULAS J134505.85+342441.8	LM*	13 45 05.85528	+34 24 41.8140						M9V	1	0
84	2MASS J13474972+3336019	LM*	13 47 49.7178075216	+33 36 01.777577148						M8V	7	0
85	ULAS J134852.93+101611.8	BD*	13 48 52.93392	+10 16 11.8848						sdL0	2	0
86	ULAS J135058.85+081506.8	BD*	13 50 58.85952	+08 15 06.8796						L5	11	0
87	2MASS J13512249+1419168	LM*	13 51 22.4332682079	+14 19 16.440903312						esdM7	2	0
88	ULAS J135216.31+312327.0	BD*	13 52 16.6691060074	+31 23 27.849229880						esdL0.5	4	0
89	ULAS J135359.58+011856.7	BD*	13 53 59.58480	+01 18 56.7828						sdL0	2	0
90	2MASS J13550323-8258375	BD*	13 55 03.238	-82 58 37.52						sdL5?	5	0
91	2MASS J13571237+1428398	BD*	13 57 12.4359107064	+14 28 39.779396940						L2	9	0
92	2MASS J13593574+3031039	LM*	13 59 35.7402416160	+30 31 03.776894472						M7V	3	0
93	2MASS J14120397+1216100	BD*	14 12 03.97104	+12 16 10.0128						sdL5	5	0
94	ULAS J141405.67-014204.0	BD*	14 14 05.66928	-01 42 03.7476						sdL0.5	3	0
95	2MASS J14162408+1348263	BD*	14 16 24.0739698960	+13 48 26.193281184						L5	75	0
96	2MASS J14183233+0253259	BD*	14 18 32.3700147502	+02 53 25.655933008						sdL0	3	0
97	GD 165B	BD*	14 24 39.09480	+09 17 10.4352					20.53	L4V	204	0
98	ULAS J143154.18-004114.3	LM*	14 31 54.18264	-00 41 14.3088						sdM9	1	0
99	2MASS J14351706-0147115	LM*	14 35 17.0913934238	-01 47 11.429686107						sdM9	2	0
100	2MASS J14392836+1929149	BD*	14 39 28.1499428599	+19 29 15.908790370						L1V	128	0
101	DENIS J144137.2-094558	BD*	14 41 37.1567200536	-09 45 59.229849096				20.030	17.234	L1+L1	54	0
102	BRLT 253	BD*	14 41 51.55392	+04 37 38.4780						sdL4	4	0
103	SSSPM J1444-2019	BD*	14 44 20.3377033020	-20 19 25.483786838				18.57	14.97	sdL0	28	1
104	ULAS J145234.65+043738.4	BD*	14 52 34.65600	+04 37 38.5500						esdL0.5	2	0
105	2MASSW J1507476-162738	BD*	15 07 47.6758255542	-16 27 40.113982846			22.136	18.928	16.579	L5V	193	0
106	2MASSW J1515008+484742	BD*	15 15 00.8530443491	+48 47 41.289697100						L6.5	60	0
107	BRLT 283	BD*	15 16 49.84944	+08 36 07.1352						sdL5	4	0
108	ULAS J151913.03-000030.0	BD*	15 19 13.03872	-00 00 30.0960						esdL4	6	0
109	* tau02 Ser	*	15 32 09.6750062424	+16 03 22.209057684		6.184	6.216			B9V	62	0
110	HD 139909	*	15 41 15.9724611912	-13 58 13.141598520		6.91	6.86			B9.5V	25	0
111	GD 190	WD*	15 44 19.4543884752	+18 06 43.775072424	13.537	14.556	14.677	14.767	14.849	DB2	86	0
112	ULAS J154638.34-011213.0	BD*	15 46 38.34192	-01 12 13.0968						sdL3	2	0
113	2MASS J16262034+3925190	BD*	16 26 20.1332795396	+39 25 19.488610341				19.67	16.68	esdL4	49	0
114	Ross 640	WD*	16 28 25.0030896166	+36 46 15.846877416		14.01		13.9		DZ6	199	0
115	2MASS J16322911+1904407	BD*	16 32 29.11416	+19 04 40.7136				22.42	19.98	L8V	129	0
116	2MASS J16403197+1231068	LM*	16 40 31.9463872416	+12 31 06.561954048				20.63		sdM8?	12	0
117	VB 8	Er*	16 55 35.2557374336	-08 23 40.753073075		18.7	16.916	14.566	12.24	M7Ve	420	0
118	2MASS J17461199+5034036	BD*	17 46 11.9722216632	+50 34 03.391567212						L5.7V	15	0
119	2MASS J17561080+2815238	BD*	17 56 10.7706488783	+28 15 23.454210794						sdL1	15	0
120	LSR J1826+3014	LM*	18 26 11.0031920693	+30 14 18.875471017			19.36	17.8		M8.5V	24	2
121	Wolf 1130	Er*	20 05 02.1950576493	+54 26 03.234326252		11.970	13.883			sdM1	136	0
122	Wolf 1130 B	BD*	20 05 20.38	+54 24 33.9						T8p	28	1
123	2MASS J20282035+0052265	BD*	20 28 20.3489639184	+00 52 26.588682516						L2.5	36	0
124	2MASS J20343769+0827009	BD*	20 34 37.6922994099	+08 27 01.187835635						L1	14	0
125	2MASS J20402401+6959057	BD*	20 40 24.1064678909	+69 59 06.168978050						sdL0	10	0
126	ULAS J205721.89+005628.7	LM*	20 57 21.89448	+00 56 28.7520						M7V	1	0
127	2MASS J21073169-0307337	BD*	21 07 31.6891615128	-03 07 33.669058548						L0	15	0
128	* 15 Aqr	*	21 18 11.0726992680	-04 31 10.127623692		5.679	5.812			B7III	52	0
129	LAWD 87	WD*	21 32 16.2327040616	+00 15 14.399267982	13.717	14.634	14.674	14.675	14.676	DB4	179	1
130	2MASS J21340795+7132312	LM*	21 34 08.0688383669	+71 32 31.747738479						sdM9	3	0
131	EGGR 148	WD*	21 42 41.0063054408	+20 59 58.123903616		13.40		12.9		DQ6	117	0
132	ULAS J214816.13+012225.1	LM*	21 48 16.13832	+01 22 25.1544						M7V	1	0
133	2MASS J22120703+3430351	BD*	22 12 07.03920	+34 30 35.1828						L6	10	0
134	ULAS J223123.44+010025.1	LM*	22 31 23.44992	+01 00 25.1604						M6V	1	0
135	ULAS J223302.03+062030.8	BD*	22 33 02.03952	+06 20 30.8436						esdL0.5	2	0
136	ULAS J223440.80+001002.6	BD*	22 34 40.80120	+00 10 02.6220						sdL1	2	0
137	ULAS J223623.17+034344.5	LM*	22 36 23.17728	+03 43 44.5260						M9V	1	0
138	ULAS J224054.61+030902.0	LM*	22 40 54.61296	+03 09 02.0196						M7V	1	0
139	2MASSI J2242531+254257	BD*	22 42 53.2162828961	+25 42 57.275865648						L3	17	0
140	ULAS J224749.77+053207.9	BD*	22 47 49.77816	+05 32 07.9152						L1	2	0
141	2MASS J22521073-1730134	BD*	22 52 10.7512306563	-17 30 13.889743018					17.9	L4.5+T3.5	56	0
142	2MASSI J2254188+312349	BD*	22 54 18.92016	+31 23 49.8300						T5.0	68	0
143	2MASS J22590210+1156035	BD*	22 59 02.14656	+11 56 02.1444						sdL0	2	0
144	ULAS J230256.53+121310.2	BD*	23 02 56.54520	+12 13 10.3944						sdL0	2	0
145	ULAS J230443.30+093423.9	BD*	23 04 43.30776	+09 34 23.9844						sdL0	3	0
146	ULAS J230711.01+014447.1	BD*	23 07 11.01336	+01 44 47.1840						usdL4.5	4	0
147	ULAS J231924.35+052524.5	BD*	23 19 24.35784	+05 25 24.5928						esdL1	2	0
148	ULAS J231949.36+044559.5	LM*	23 19 49.36080	+04 45 59.5404						M7V	1	0
149	GD 248	WD*	23 26 06.5870716824	+16 00 19.281439836	14.431	15.206	15.112	15.034	14.977	DA5	82	0
150	ULAS J233211.22+045554.2	LM*	23 32 11.22288	+04 55 54.2280						M6V	1	0
151	2MASS J23322678+1234530	BD*	23 32 26.78784	+12 34 53.0292						L6p+T4p	4	0
152	* 26 Psc	*	23 55 07.7926417896	+07 04 15.496121280		6.153	6.209			B9V	57	0

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