2008AJ....135.1000M

Query : 2008AJ....135.1000M

2008AJ....135.1000M - Astron. J., 135, 1000-1007 (2008/March-0)

Finding extreme subdwarfs.

MARSHALL J.L.

Abstract (from CDS):

I develop a new technique to identify M-type extreme subdwarfs (esdMs) and demonstrate that it is substantially more efficient than previous methods. I begin by obtaining spectroscopy and improved photometry of a sample of 54 late-type halo candidates using the rNLTT reduced proper-motion (RPM) diagram. From spectroscopy, I find that four of these are esdMs, three of which were previously unknown. From the improved photometry, I show that all four lie in a narrow RPM corridor that contains only four non-esdMs. Hence, with good photometry (i.e., without spectroscopy), it appears possible to select esdM candidates with a 50% esdM yield. This is more than an order of magnitude more efficient than previous methods.

Abstract Copyright: ∼

Journal keyword(s): stars: late-type - stars: low mass, brown dwarfs

Simbad objects: 53

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Number of rows : 53
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 LP 645-78 LM* 00 25 51.2094370930 -07 48 07.975884728           sdM6 22 0
2 LP 151-28 PM* 01 18 08.4465882432 +49 57 36.522935028   20.3   18.1   ~ 4 0
3 LP 151-38 PM* 01 25 10.2226587360 +46 10 26.731149600   21.2   18.3   ~ 6 0
4 LP 708-117 PM* 01 34 59.1603171347 -09 04 42.089604457   21.2       M8.8V 11 0
5 LP 588-21 PM* 01 36 57.1280553864 -01 02 20.482808028     19.14     ~ 3 0
6 LP 409-9 PM* 01 58 28.1983980279 +17 01 04.197721083   20.5   17.8   ~ 5 0
7 LP 711-64 PM* 02 54 06.5279802245 -08 36 00.528124338     18.94     ~ 4 0
8 LP 31-204 PM* 03 42 55.9917522480 +72 29 37.080799800   16.7   14.9   ~ 4 0
9 LP 889-5 PM* 03 50 43.7924506350 -28 41 13.328498344     18.72     ~ 5 0
10 LP 414-26 PM* 03 59 20.0410269192 +16 03 05.133955392   19.9   17.9   ~ 6 0
11 LP 301-36 PM* 04 15 44.5566572306 +28 15 08.521586425   20.1   17.8   ~ 4 0
12 LP 31-304 PM* 04 16 21.6641270688 +75 25 18.870841272     19.75     ~ 4 0
13 LP 415-12 PM* 04 21 06.0502909581 +18 55 30.267387109   20.1   18.2   dM5.0 12 0
14 LP 475-138 PM* 04 33 03.5835733008 +14 50 51.401965524   20.7   17.4   ~ 5 0
15 LP 417-42 LM* 05 10 39.0753733822 +19 24 07.020164855   19.9   17.4   esdM6 38 0
16 LP 837-42 PM* 05 56 19.9963388856 -22 46 13.888658928     19.09     ~ 3 0
17 LP 779-7 PM* 06 01 43.8565456656 -18 10 41.632290264     18.77     sdM6.5 7 0
18 LP 254-8 PM* 06 35 07.6618531056 +35 58 21.890394012   18.2   17.8   ~ 5 0
19 LP 161-2 PM* 06 40 36.3401744688 +49 59 43.180418040   20.1   18.6   ~ 4 0
20 LP 308-12 PM* 07 01 57.1274119174 +30 15 08.449482152   18.8   16.7   ~ 5 0
21 LP 122-34 WD* 07 05 49.3175956536 +51 42 50.518134467   19.0   17.6   DA 14 0
22 LP 604-25 PM* 08 15 37.3289938170 -00 02 53.003947551   18.9       sdM4 11 0
23 LP 313-21 LM* 09 10 24.4317071990 +27 19 19.585679749   20.6   18.8   M4V 10 0
24 LP 607-19 PM* 09 12 45.4617587801 -01 40 58.102169549     18.68     ~ 4 0
25 LP 428-25 PM* 09 41 48.0666079256 +17 21 46.195047363           sdM3.5 11 0
26 LP 429-3 LM* 09 56 03.9528783474 +17 59 44.575962134   20.5   18.6   M3V 6 0
27 LP 167-24 PM* 10 17 15.6153160488 +46 54 06.246654804   20.8   18.6   ~ 4 0
28 LP 790-37 PM* 10 42 46.9351397134 -18 01 01.972026778   20.1       sdM4.5 12 0
29 LP 267-109 PM* 12 39 41.6750914738 +35 18 24.366903922   19.3   17.4   sdM4.5 12 0
30 LP 910-36 PM* 13 13 46.4957044647 -28 58 30.038670605     18.70     ~ 4 0
31 LP 379-49 LM* 13 31 28.2566163684 +24 47 10.894331967   20.9   19.1   sdM6 15 0
32 LP 856-2 PM* 13 47 21.7023168994 -26 53 45.189300095     18.23     ~ 5 0
33 LP 440-7 PM* 14 19 10.3906577057 +20 23 30.088183114   19.8   17.6   sdM5.5 14 0
34 LP 800-4 PM* 14 24 37.5091872354 -18 53 36.010293857     19.09     ~ 5 0
35 LP 741-7 PM* 14 47 00.9301365162 -15 00 20.717527263     18.94     ~ 4 0
36 LP 222-20 LM* 14 58 08.5029940859 +39 38 50.071431540   20.0   17.4   M4V 11 0
37 LP 803-33 PM* 15 48 23.6391093096 -19 52 48.584219448           M5V 8 0
38 LP 136-56 PM* 16 10 59.2726247784 +56 11 35.762732448   20.6   19.0   ~ 4 0
39 LP 330-15 PM* 16 26 24.5577898139 +28 56 26.006563180   19.9   17.5   ~ 5 0
40 LP 180-29 PM* 17 48 04.3516163705 +46 23 53.469494639   19.2   16.6   ~ 7 0
41 LP 140-33 * 18 37 09.4778331384 +52 20 31.125762348     19.39     ~ 3 0
42 LP 280-24 PM* 18 56 42.6521442168 +34 13 58.848626676   20.7   18.0   ~ 4 0
43 LP 754-7 PM* 19 57 34.5657187542 -11 29 59.068979559     19.19     ~ 3 0
44 LP 872-22 LM* 20 52 08.5882795503 -23 18 10.138588364     19.95 17.32   M6.5e 16 0
45 LP 872-39 PM* 21 05 14.0334828762 -24 46 51.958874913   18.8 17.829 16.402 14.856 d/sdM5 13 0
46 LP 929-20 PM* 21 17 50.3987901018 -29 22 05.157882962   18.8       sdM3.5 9 0
47 LP 517-49 PM* 21 26 03.4844706217 +14 29 18.242675463   20.2   18.8   ~ 6 0
48 LP 518-12 PM* 21 32 49.3432131273 +12 50 35.760078321   17.7   16.6   M4.5V 17 0
49 LP 758-60 LM* 21 55 47.9570859391 -11 21 42.774681998     17.40     esdM5 26 0
50 LP 400-42 PM* 22 40 46.2382682184 +26 08 20.396666832   20.3   17.7   ~ 4 0
51 LP 344-46 PM* 22 49 03.2390547960 +32 07 25.351592988   19.9   17.6   ~ 6 0
52 LP 877-1 PM* 22 52 45.4959788820 -25 25 21.223650143   20.2       sdM4 9 0
53 LP 401-14 WD* 22 55 12.9107086536 +25 49 29.553522636   16.8   16.8   DA 16 0

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