2017MNRAS.464.3040Z

Query : 2017MNRAS.464.3040Z

2017MNRAS.464.3040Z - Mon. Not. R. Astron. Soc., 464, 3040-3059 (2017/January-3)

Primeval very low-mass stars and brown dwarfs - I. Six new L subdwarfs, classification and atmospheric properties.

ZHANG Z.H., PINFIELD D.J., GALVEZ-ORTIZ M.C., BURNINGHAM B., LODIEU N., MAROCCO F., BURGASSER A.J., DAY-JONES A.C., ALLARD F., JONES H.R.A., HOMEIER D., GOMES J. and SMART R.L.

Abstract (from CDS):

We have conducted a search for L subdwarf candidates within the photometric catalogues of the UKIRT Infrared Deep Sky Survey and Sloan Digital Sky Survey. Six of our candidates are confirmed as L subdwarfs spectroscopically at optical and/or near-infrared wavelengths. We also present new optical spectra of three previously known L subdwarfs (WISEA J001450.17-083823.4, 2MASS J00412179+3547133, and ULAS J124425.75+102439.3). We examined the spectral type and metallicity classification of subclasses of known L subdwarfs. We summarized the spectroscopic properties of L subdwarfs with different spectral types and subclasses. We classify these new L subdwarfs by comparing their spectra to known L subdwarfs and L dwarf standards. We estimate temperatures and metallicities of 22 late-type M and L subdwarfs by comparing their spectra to BT-Settl models. We find that L subdwarfs have temperatures between 1500 and 2700 K, which are higher than similar-typed L dwarfs by around 100-400 K depending on different subclasses and subtypes. We constrained the metallicity ranges of subclasses of M, L, and T subdwarfs. We also discussed the spectral-type and absolute magnitude relationships for L and T subdwarfs.

Abstract Copyright: © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): brown dwarfs - stars: chemically peculiar - stars: individual: (ULAS J021642.97+004005.6, ULAS J124947.04+095019.8, SDSS J133348.24+273508.8, ULAS J133836.97-022910.7, SDSS J134749.74+333601.7, ULAS J151913.03-000030.0) - stars: low-mass - stars: Population II - subdwarfs - subdwarfs

Simbad objects: 76

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Number of rows : 76
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 2MASS J00144919-0838207 BD* 00 14 49.1134104836 -08 38 20.542837506           sdL0 14 0
2 2MASS J00412179+3547133 BD* 00 41 21.8109482112 +35 47 13.392820392           sdL0.5 12 0
3 2MASS J00470038+6803543 BD* 00 47 00.38664 +68 03 54.3672           L9pec 86 0
4 2MASS J00575687+2013075 BD* 00 57 56.87160 +20 13 07.5396           sdL7? 8 0
5 2MASSI J0103320+193536 BD* 01 03 32.03712 +19 35 36.1824           L6V 93 0
6 2MASS J01301256-1047285 PM* 01 30 12.5705767208 -10 47 28.872904182           M9 6 0
7 2MASSI J0131183+380155 BD* 01 31 18.4173338522 +38 01 55.392211334           L1.5 22 0
8 2MASS J01340281+0508125 BD* 01 34 02.7928138056 +05 08 13.061582628           L1 7 0
9 2MASS J01423153+0523285 LM* 01 42 31.5178112201 +05 23 29.101048248       19.49   sdM7.5? 11 0
10 2MASSW J0147334+345311 BD* 01 47 33.4442673288 +34 53 11.083329816           L0.5V 16 0
11 2MASS J02020138-3136318 PM* 02 02 01.3875470943 -31 36 32.892156482           ~ 8 0
12 2MASS J02081833+2542533 BD* 02 08 18.3864053730 +25 42 53.199852759           L1V 53 0
13 SDSS J021642.98+004005.9 BD* 02 16 42.98472 +00 40 05.9952           sdL4 5 0
14 2MASSI J0228110+253738 BD* 02 28 11.01312 +25 37 38.0136           L0 28 0
15 HD 16031 PM* 02 34 11.0485653360 -12 23 03.444110700 9.99 10.21 9.77     F0V 179 1
16 2MASS J02512220+2521236 LM* 02 51 22.2202448808 +25 21 23.558424192           M9V 9 0
17 2MASS J03060140-0330438 LM* 03 06 01.4335104089 -03 30 45.460705468           sdM9 11 0
18 2MASSW J0310599+164816 BD* 03 10 59.86560 +16 48 15.5988           L8V 57 0
19 ULAS J033350.84+001406.1 BD* 03 33 50.7462270574 +00 14 06.208902954           sdL0.0 8 0
20 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 136 0
21 2MASS J04353511+2115201 BD* 04 35 35.1905356016 +21 15 18.934401687           sdL0 16 0
22 2MASS J04470652-1946392 PM* 04 47 06.4802475630 -19 46 39.001611485           sdM7: 6 0
23 LEHPM 2-59 LM* 04 52 09.9531022259 -22 45 09.344928797       18.82 17.22 esdM8.5 14 0
24 2MASS J05325346+8246465 BD* 05 32 54.4345118405 +82 46 45.161005926           esdL7 65 0
25 NAME Gal Anticenter reg 05 46 +28.9           ~ 1024 0
26 APMPM J0559-2903 LM* 05 58 58.9230621580 -29 03 26.708741813       18.12 16.32 esdM7.5 26 0
27 2MASS J06164006-6407194 BD* 06 16 40.06 -64 07 19.5           sdL5 19 0
28 HD 289002 * 06 45 13.3725491952 +02 08 14.685250596 10.06 10.62 10.44     B1 277 0
29 2MASS J06453153-6646120 BD* 06 45 31.53216 -66 46 12.0432           sdL8 12 0
30 HD 62388 * 07 43 14.9961376440 -12 24 02.106201600   8.93 8.90     A0V 14 0
31 HD 71043 * 08 22 55.1581878672 -52 07 25.424206824   5.900 5.887     A0V 73 0
32 2MASS J08503593+1057156 BD* 08 50 35.93400 +10 57 15.6168       22.466 20.349 L6.5+L8.5 85 0
33 2MASS J09153413+0422045 BD* 09 15 34.13712 +04 22 04.5948           L6 42 0
34 2MASSI J0937347+293142 BD* 09 37 34.87968 +29 31 40.9908           T6 99 1
35 SSSPM J1013-1356 LM* 10 13 07.3464466893 -13 56 21.261502194       18.73 16.01 sdM9.5 44 1
36 2MASS J10133048-7246231 BD* 10 13 30.485 -72 46 23.11           sdL2? 7 0
37 LSPM J1048+0111 BD* 10 48 42.8144208091 +01 11 58.221081965       19.4   L1 64 0
38 2MASS J11582077+0435014 BD* 11 58 20.7331430107 +04 35 02.400141131           sdL7 26 0
39 2MASS J12212770+0257198 BD* 12 21 27.7124211648 +02 57 19.767907440           L0.5 51 0
40 2MASS J12442595+1024432 BD* 12 44 25.9690664151 +10 24 43.179211214           sdL0.5 8 0
41 HD 110749 * 12 44 29.3281380840 -28 42 36.313726824   10.89 10.78     A0V(n) 6 0
42 SDSS J124947.11+095020.6 BD* 12 49 46.9130668804 +09 50 17.714627072           sdL1 3 0
43 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1274 0
44 2MASS J12563716-0224522 BD* 12 56 37.1377931858 -02 24 52.266257764           esdL3.5 43 0
45 HD 114762B BD* 13 12 19.7504 +17 31 01.628           L1.0 18 0
46 2MASS J13313310+3407583 BD* 13 31 33.1077877455 +34 07 58.212760199           L1 25 0
47 2MASS J13334822+2735115 BD* 13 33 48.24192 +27 35 08.8908           sdL0 10 0
48 ULAS J133836.97-022910.7 BD* 13 38 37.01088 -02 29 08.4480           sdL7 8 0
49 2MASS J13474972+3336019 LM* 13 47 49.7178075216 +33 36 01.777577148           M8V 10 0
50 ULAS J135058.85+081506.8 BD* 13 50 58.85952 +08 15 06.8796           L5 11 0
51 2MASS J14162408+1348263 BD* 14 16 24.0739698960 +13 48 26.193281184           L5 88 1
52 HD 126053B BD* 14 23 20.79 +01 16 38.2           T8 32 0
53 LP 440-52 LM* 14 39 00.3086540071 +18 39 38.710151529   19.6 18.39 17.3 14.64 sdM7 68 0
54 2MASS J14392836+1929149 BD* 14 39 28.1499428599 +19 29 15.908790370           L1V 145 0
55 SSSPM J1444-2019 BD* 14 44 20.3377033020 -20 19 25.483786838       18.57 14.97 sdL0 36 1
56 HD 130163 * 14 47 46.9396067376 -39 55 35.041449648   6.93 6.92     A1V 38 0
57 BD+06 2986 PM* 15 04 53.5261634600 +05 38 17.160679455 12.262 11.13 9.815 8.998 8.257 K8V 107 0
58 2MASSW J1507476-162738 BD* 15 07 47.6758255542 -16 27 40.113982846     22.136 18.928 16.579 L5V 216 0
59 LSPM J1516+6053 LM* 15 16 50.3383295837 +60 53 05.320595520   21.0   18.9   esdM5.5 9 0
60 ULAS J151913.03-000030.0 BD* 15 19 13.03872 -00 00 30.0960           esdL4 6 0
61 HD 141559 * 15 51 27.4078496280 -42 18 02.567338632   8.31 8.26     B9V 14 0
62 2MASS J16262034+3925190 BD* 16 26 20.1332795396 +39 25 19.488610341       19.67 16.68 esdL4 55 0
63 Ross 640 WD* 16 28 25.0030896166 +36 46 15.846877416   14.01   13.9   DZ6 220 0
64 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 145 0
65 2MASS J16403197+1231068 LM* 16 40 31.9463872416 +12 31 06.561954048       20.63   sdM8? 14 0
66 G 19-16B LM* 17 12 51.2124829073 -05 07 25.429486239           d/sdM7 17 0
67 2MASSW J1728114+394859 BD* 17 28 11.50056 +39 48 59.3100           L5+L6.5 65 0
68 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
69 HD 161941 * 17 48 20.2413997296 +03 48 15.167814660   6.342 6.225     B9/A0III 51 0
70 2MASS J17561080+2815238 BD* 17 56 10.7706488783 +28 15 23.454210794           sdL1 27 0
71 LSR J1826+3014 LM* 18 26 11.0031920693 +30 14 18.875471017     19.36 17.8   M8.5V 29 2
72 Wolf 1130 B BD* 20 05 21.77853 +54 24 43.2739           T8p 45 0
73 2MASS J20343769+0827009 BD* 20 34 37.6922994099 +08 27 01.187835635           L1 20 0
74 2MASS J20402401+6959057 BD* 20 40 24.1064678909 +69 59 06.168978050           sdL0 12 0
75 SDSS J210105.37-065633.0 LM* 21 01 05.3713152816 -06 56 32.921323656           ~ 2 0
76 2MASS J21073169-0307337 BD* 21 07 31.6891615128 -03 07 33.669058548           L0 22 0

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