2002ApJ...564..466G


Query : 2002ApJ...564..466G

2002ApJ...564..466G - Astrophys. J., 564, 466-481 (2002/January-1)

Toward spectral classification of L and T dwarfs: infrared and optical spectroscopy and analysis.

GEBALLE T.R., KNAPP G.R., LEGGETT S.K., FAN X., GOLIMOWSKI D.A., ANDERSON S., BRINKMANN J., CSABAI I., GUNN J.E., HAWLEY S.L., HENNESSY G., HENRY T.J., HILL G.J., HINDSLEY R.B., IVEZIC Z., LUPTON R.H., McDANIEL A., MUNN J.A., NARAYANAN V.K., PENG E., PIER J.R., ROCKOSI C.M., SCHNEIDER D.P., SMITH J.A., STRAUSS M.A., TSVETANOV Z.I., UOMOTO A., YORK D.G. and ZHENG W.

Abstract (from CDS):

We present 0.6-2.5 µm, R≳400 spectra of 27 cool, low-luminosity stars and substellar objects. Based on these and previously published spectra, we develop a preliminary spectral classification system for L and T dwarfs. For late L and T types the classification system is based entirely on four spectral indices in the 1-2.5 µm interval. Two of these indices are derived from water absorption bands at 1.15 and 1.4 µm, the latter of which shows a smooth increase in depth through the L and T sequences and can be used to classify both spectral types. The other two indices make use of methane absorption features in the H and K bands, with the K-band index also applicable to mid-to-late L dwarfs. Continuum indices shortward of 1 µm used by previous authors to classify L dwarfs are found to be useful only through mid-L subclasses. We employ the 1.5 µm water index and the 2.2 µm methane index to complete the L classification through L9.5 and to link the new system with a modified version of the 2MASS ``color-d'' index. By correlating the depths of the methane and water absorption features, we establish a T spectral sequence from T0 to T8, based on all four indices, that is a smooth continuation of the L sequence. We reclassify two 2MASS L8 dwarfs as L9 and L9.5 and identify one SDSS object as L9. In the proposed system methane absorption appears in the K band approximately at L8, two subclasses earlier than its appearance in the H band. The L and T spectral classes are distinguished by the absence and presence, respectively, of H-band methane absorption.

Abstract Copyright:

Journal keyword(s): Infrared: Stars - Stars: Low-Mass, Brown Dwarfs - Surveys

CDS comments: Table 4 : T 513 = TVLM 513-46546 ?, LP 944 = LP 944-20 ?

Simbad objects: 77

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Number of rows : 77
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 G 158-27 PM* 00 06 43.1973190107 -07 32 17.019101068     13.837 13.605 10.15 M5.5V 192 0
2 V* GQ And Er* 00 18 25.8251408611 +44 01 38.092431857   12.84 11.04 10.3   M3.5V 267 0
3 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 199 1
4 2MASSI J0028394+150141 BD* 00 28 39.43224 +15 01 41.8620           L4.5V 20 0
5 2MASS J00325937+1410371 BD* 00 32 59.37576 +14 10 37.1136           L8V 27 0
6 LSPM J0036+1821 BD* 00 36 16.1118891182 +18 21 10.286665966       18.451 16.053 L3.5 201 0
7 2MASS J01075242+0041563 BD* 01 07 52.42200 +00 41 56.3964           L8 50 0
8 BRLT 38 BD* 01 51 41.55936 +12 44 30.0768           T0.5 65 0
9 DENIS J020529.0-115925 BD* 02 05 29.3651195393 -11 59 29.721210536           L7V 146 0
10 2MASS J02074284+0000564 BD* 02 07 42.84984 +00 00 56.4408           T4.5 37 0
11 2MASS J02361794+0048548 BD* 02 36 17.94024 +00 48 54.8208           L6V 18 0
12 2MASSW J0310599+164816 BD* 03 10 59.86560 +16 48 15.5988           L8V 46 0
13 2MASSI J0328426+230205 BD* 03 28 42.65592 +23 02 05.1900           L9.5 46 0
14 LP 944-20 LM* 03 39 35.2523500210 -35 25 43.641996333     18.69 16.39 13.288 M9.5Ve 280 0
15 Cl* Melotte 22 KPNO 2 BD* 03 45 43.1616128256 +25 40 23.239779672         17.36 L0V 119 0
16 2MASSI J0423485-041403 BD* 04 23 48.5763811987 -04 14 03.246502948           L6.5+T2 117 0
17 SIPS J0539-0059 BD* 05 39 52.0040375405 -00 59 01.491092352           L5V 79 0
18 2MASS J05591914-1404488 BD* 05 59 19.1872549354 -14 04 49.206913185           T4.5 141 0
19 HD 42581B BD* 06 10 34.80 -21 52 00.0           T6.5 486 0
20 LSPM J0746+2000 BD* 07 46 42.50553 +20 00 31.9757       17.9 15.034 L0+L1.5 176 1
21 2MASSI J0825196+211552 BD* 08 25 19.6125672818 +21 15 51.549358145       21.97 19.22 L7.5V 110 0
22 2MASS J08300825+4828482 BD* 08 30 08.1496038211 +48 28 47.538657498           L9.5 38 0
23 G 252-13 PM* 08 31 30.1192199475 +73 03 45.775727249   14.61   12.5   M4.0V 39 0
24 SDSS J083717.21-000018.0 BD* 08 37 17.20032 -00 00 19.3608           T1 45 0
25 2MASS J08575849+5708514 BD* 08 57 58.4721442289 +57 08 51.414025854           L7V 40 0
26 2MASS J09261537+5847212 BD* 09 26 15.37752 +58 47 21.2280           T3.5+T5 30 0
27 2MASS J10210969-0304197 BD* 10 21 09.69240 -03 04 19.7904           T1+T4 71 0
28 2MASSW J1047539+212423 BD* 10 47 53.85456 +21 24 23.4684           T6.5 80 0
29 LP 731-58 Er* 10 48 12.6142508200 -11 20 09.610693470     15.784 16.01 11.25 M6.5V 158 0
30 Wolf 359 Er* 10 56 28.9208702274 +07 00 53.003285286 16.706 15.541 13.507 11.684 9.507 dM6 686 0
31 SIPS J1058-1548 BD* 10 58 47.8366017792 -15 48 17.250428304       20.095 17.764 L3V 90 2
32 BD+44 2051 PM* 11 05 28.5769490063 +43 31 36.386948721 11.440 10.270   7.9   M1.0V 302 0
33 BD+44 2051B Er* 11 05 30.8855820790 +43 31 17.885197587   16.45 14.45 13.4   M6.0V 226 0
34 2MASS J11101001+0116130 BD* 11 10 10.01064 +01 16 13.0872           T5.5 71 0
35 2MASS J12171110-0311131 BD* 12 17 11.10288 -03 11 13.1748           T7.5 81 0
36 2MASS J12255432-2739466 BD* 12 25 54.32328 -27 39 46.6776           T5.5+T8 57 0
37 SIPS J1228-1547 BD* 12 28 15.23184 -15 47 34.2312       20.187 18.163 L5.5+L5.5 142 0
38 LP 130-226 PM* 12 29 14.1557897744 +53 33 06.121451284   19.0   16.7   M6V 35 0
39 2MASS J12545393-0122474 BD* 12 54 53.9040607346 -01 22 47.399401142           T2e: 142 0
40 2MASS J12573726-0113360 BD* 12 57 37.26024 -01 13 36.2604           L5V 14 0
41 NAME Kelu-1 BD* 13 05 40.1642434199 -25 41 05.712165150         16.85 L2+L3.5 245 0
42 2MASS J13141551-0008480 BD* 13 14 15.51648 -00 08 48.0408           L3.5 7 0
43 2MASS J13262981-0038314 BD* 13 26 29.81880 -00 38 31.4880           L5.5V 38 0
44 2MASS J13464634-0031501 BD* 13 46 46.34496 -00 31 50.1312           T6 72 0
45 GD 165B BD* 14 24 39.09480 +09 17 10.4352         20.53 L4V 201 0
46 LP 98-79 Er* 14 30 37.7904858054 +59 43 24.867105409   19.7 17.88 16.8 13.31 M6.5V 67 0
47 BD-11 3759 BY* 14 34 16.8116623459 -12 31 10.414495538 14.041 12.915 11.317 10.093 8.473 M3.5V 175 0
48 2MASS J14460061+0024519 BD* 14 46 00.61560 +00 24 51.9660           L5V 33 0
49 LP 914-54 Er* 14 56 38.2634715567 -28 09 48.619153485     17.141 14.863 12.433 M7.0Ve 147 0
50 GJ 570 D BD* 14 57 14.96256 -21 21 47.7504           T8 211 1
51 HD 131976 SB* 14 57 26.53330 -21 24 41.5778 10.759 9.559 8.065 7.075 9.02 M1.5V 236 1
52 TVLM 513-46 LM* 15 01 08.1864639648 +22 50 02.137869060   21.4 15.09 18.0   M8.5V 157 0
53 * eta CrB C BD* 15 23 22.63488 +30 14 56.2092           L8V 99 1
54 Ross 513B PM* 15 35 20.3303100438 +17 43 04.419693584       14.84   M4.5V 41 0
55 Ross 513 PM* 15 35 20.5212300654 +17 42 46.882017401   13.98   12.055   M2.5V 58 1
56 L 768-119 SB* 15 42 06.5402655256 -19 28 18.312134612 14.559 13.46 11.855 10.738 9.305 M3 78 0
57 2MASS J16241436+0029158 BD* 16 24 14.36712 +00 29 15.8172           T6V 137 0
58 2MASS J16322911+1904407 BD* 16 32 29.11416 +19 04 40.7136       22.42 19.98 L8V 126 0
59 V* CM Dra BY* 16 34 20.3302660573 +57 09 44.368918696   14.50 12.87 10.85 9.26 M4.5V 427 0
60 Wolf 629 PM* 16 55 25.2222453644 -08 19 21.296969167 14.691 13.436 11.759 10.574 9.044 M3.5V 210 0
61 VB 8 Er* 16 55 35.2557374336 -08 23 40.753073075   18.7 16.916 14.566 12.24 M7Ve 415 0
62 HD 156384C PM* 17 18 58.8272997802 -34 59 48.612673382 12.96 11.79 10.22 10.05 8.82 M1.5V 194 1
63 G 181-42 PM* 17 23 52.3795826759 +33 00 07.310568980   14.6   13.248   M3 16 0
64 2MASS J17503293+1759042 BD* 17 50 32.93832 +17 59 04.2504           T3.5 48 0
65 LP 102-320 PM* 17 55 33.4226960149 +58 24 27.503724718   19.0 17.98 16.6 14.02 M5.5V 33 0
66 NAME Barnard's star BY* 17 57 48.4984700685 +04 41 36.113879676 12.497 11.24 9.511 8.298 6.741 M4V 760 2
67 HD 173739 PM* 18 42 46.7043860406 +59 37 49.409446059   10.782   8.1   M3V 360 1
68 HD 173740 PM* 18 42 46.8946714770 +59 37 36.721161413   11.705   8.9   M3.5V 317 1
69 LP 229-30 CV* 18 43 22.1259892136 +40 40 21.343851516   19.2   16.6   M7.5Ve 60 0
70 G 208-44 Er* 19 53 54.4821159649 +44 24 51.341564299   15.31 13.126 13.083 9.78 M5.5Ve 204 1
71 G 208-45 Er* 19 53 55.1405033909 +44 24 54.147256052   15.97 13.99 14.3 10.27 M6V 178 0
72 G 125-55 PM* 20 03 26.5810806615 +29 51 59.529213703       14.09 11.24 M4.5V 76 0
73 Wolf 896 PM* 20 56 46.5969248424 -10 26 54.747253252 14.112 12.999 11.487 10.428 9.106 dM2.5 94 0
74 Wolf 918 PM* 21 09 17.4271514815 -13 18 09.013127841 13.501 12.362 10.869 9.891 8.805 M1V 136 0
75 LP 760-3 Er* 22 28 54.3488414218 -13 25 19.457590378   19.3 17.14     M6.5V 72 0
76 2MASS J22495345+0044046 BD* 22 49 53.45592 +00 44 04.6608           L3+L5 42 0
77 2MASS J22552907-0034336 LM* 22 55 29.0832187176 -00 34 33.656819808     20.26     M8.6V 29 1

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2022.11.30-17:41:18

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