2017A&A...598A..92L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:37:24

2017A&A...598A..92L - Astronomy and Astrophysics, volume 598A, 92-92 (2017/2-1)

New ultracool subdwarfs identified in large-scale surveys using Virtual Observatory tools. II. SDSS DR7 vs. UKIDSS LAS DR6, SDSS DR7 vs. UKIDSS LAS DR8, SDSS DR9 vs. UKIDSS LAS DR10, and SDSS DR7 vs. 2MASS.

LODIEU N., ESPINOZA CONTRERAS M., ZAPATERO OSORIO M.R., SOLANO E., ABERASTURI M., MARTIN E.L. and RODRIGO C.

Abstract (from CDS):

Aims. We aim to develop an efficient method to search for late-type subdwarfs (metal-depleted dwarfs with spectral types ≥M5) to improve the current statistics. Our objectives are to improve our knowledge of metal-poor low-mass dwarfs, bridge the gap between the late-M and L types, determine their surface density, and understand the impact of metallicity on the stellar and substellar mass function.
Methods. We carried out a search cross-matching the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) and the Two Micron All Sky Survey (2MASS), and different releases of SDSS and the United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) using STILTS, Aladin, and Topcat developed as part of the Virtual Observatory tools. We considered different photometric and proper motion criteria for our selection. We identified 29 and 71 late-type subdwarf candidates in each cross-correlation over 8826 and 3679 sq. deg, respectively (2312 sq. deg overlap). We obtained our own low-resolution optical spectra for 71 of our candidates: 26 were observed with the Gran Telescopio de Canarias (GTC; R∼350, λλ5000-10000Å), six with the Nordic Optical Telescope (NOT; R∼450, λλ5000-10700Å), and 39 with the Very Large Telescope (VLT; R∼350, λλ6000-11000Å). We also retrieved spectra for 30 of our candidates from the SDSS spectroscopic database (R∼2000 and λλ3800-9400Å), nine of these 30 candidates with an independent spectrum in our follow-up. We classified 92 candidates based on 101 optical spectra using two methods: spectral indices and comparison with templates of known subdwarfs.
Results. We developed an efficient photometric and proper motion search methodology to identify metal-poor M dwarfs. We confirmed 86% and 94% of the candidates as late-type subdwarfs from the SDSS vs. 2MASS and SDSS vs. UKIDSS cross-matches, respectively. These subdwarfs have spectral types ranging between M5 and L0.5 and SDSS magnitudes in the r=19.4-23.3mag range. Our new late-type M discoveries include 49 subdwarfs, 25 extreme subdwarfs, six ultrasubdwarfs, one subdwarf/extreme subdwarf, and two dwarfs/subdwarfs. In addition, we discovered three early-L subdwarfs to add to the current compendium of L-type subdwarfs known to date. We doubled the numbers of cool subdwarfs (11 new from SDSS vs. 2MASS and 50 new from SDSS vs. UKIDSS). We derived a surface density of late-type subdwarfs of 0.040+0.012–0.007 per square degree in the SDSS DR7 vs. UKIDSS LAS DR10 cross-match (J=15.9-18.8mag) after correcting for incompleteness. The density of M dwarfs decreases with decreasing metallicity. We also checked the Wide Field Survey Explorer (AllWISE) photometry of known and new subdwarfs and found that mid-infrared colours of M subdwarfs do not appear to differ from their solar-metallicity counterparts of similar spectral types. However, the near-to-mid-infrared colours J-W2 and J-W1 are bluer for lower metallicity dwarfs, results that may be used as a criterion to look for late-type subdwarfs in future searches.

Abstract Copyright: © ESO, 2017

Journal keyword(s): Galaxy: halo - subdwarfs - techniques: photometric - techniques: spectroscopic - surveys - virtual observatory tools

VizieR on-line data: <Available at CDS (J/A+A/598/A92): table1.dat table2.dat table4.dat sp/*>

Simbad objects: 125

goto Full paper

goto View the reference in ADS

Number of rows : 125

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 LP 645-78 PM* 00 25 51.2102376823 -07 48 07.973319514   20.6       M7.9V 17 0
2 LP 350-34 PM* 00 55 44.2808341655 +25 06 23.582665644   20.6   17.8   sdM6.5 16 0
3 SDSS J010448.46+153501.8 BD* 01 04 48.46968 +15 35 01.8960           usdL1.5 5 0
4 USNO-B1.0 0889-00016008 LM* 01 34 52.4097926679 -01 04 37.439836592           sdM6.0 2 0
5 2MASS J02053376+1238242 LM* 02 05 33.7498616481 +12 38 24.039784862           sdM8.0 5 0
6 ULAS J021258.08+064115.9 BD* 02 12 58.07112 +06 41 17.5632           sdL0.5 3 0
7 LP 417-42 LM* 05 10 39.0759338392 +19 24 07.024417239   19.9   17.4   esdM5.5 35 0
8 APMPM J0559-2903 PM* 05 58 58.9231280556 -29 03 26.708087027       18.12 16.32 esdM7 21 0
9 SDSS J074013.59+242945.2 LM* 07 40 13.6087720965 +24 29 45.334698077           esdM6 3 0
10 ULAS J074431.30+283915.6 LM* 07 44 31.25352 +28 39 16.5996           sdM7.0 1 0
11 SDSS J075002.47+211521.2 LM* 07 50 02.35752 +21 15 23.9148           dM3.0 1 0
12 ULAS J080605.58+292758.6 LM* 08 06 05.53467 +29 28 01.6218           esdM7.0-7.5 1 0
13 LSPM J0822+1700 LM* 08 22 33.7510263993 +17 00 18.931432210       18.7   usdM7.5 15 0
14 ULAS J082650.62+285252.0 LM* 08 26 50.57376 +28 52 53.4252           sdM6.5-7.0 1 0
15 LP 258-28 LM* 08 30 51.6486055998 +36 12 56.811125640   19.7   16.6   esdM6 15 0
16 2MASS J08352610+3929145 LM* 08 35 26.1473388708 +39 29 14.854828070           esdM6.0 2 0
17 2MASS J08373729+3809585 LM* 08 37 37.2937659896 +38 09 58.752504145           M6V 3 0
18 LP 545-45 LM* 08 43 58.4562189814 +06 00 39.411478772   19.7 18.49 17.1   esdM5.5 21 0
19 LP 312-32 LM* 08 46 48.8961608715 +30 28 02.881542089   20.8   18.8   usdM6 7 0
20 SDSS J085500.38+354107.5 LM* 08 55 00.3926760888 +35 41 08.255160802           sdM4.5 3 0
21 2MASS J08554875+3636020 LM* 08 55 48.7189178212 +36 36 01.611189911           esdM6.5-7.0 3 0
22 SDSS J085833.76+020452.9 LM* 08 58 33.7568319661 +02 04 52.901530621           sdM6 4 0
23 SDSS J085838.92+091957.6 LM* 08 58 38.9382513667 +09 19 58.156494980           sdM6.5 1 0
24 LP 486-42 LM* 09 03 08.0512640950 +08 42 43.736370726   18.8   16.8   esdM5.5 12 0
25 LSPM J0904+4638 LM* 09 04 23.0459268846 +46 38 19.042727568   20.8   19.4   esdM6.5 3 0
26 LSPM J0907+4620 A LM* 09 07 41.7825576224 +46 20 35.474779257           dM4.0 1 0
27 LP 426-61 LM* 09 09 03.7016222585 +19 41 44.312530427   18.59   16.6   sdM7.0 11 1
28 ULAS J093244.49+011258.2 LM* 09 32 44.46024 +01 12 59.8860           sdM8.0-8.5 1 0
29 SDSS J094043.35+394035.2 LM* 09 40 43.3979760247 +39 40 36.605971110           esdM6.0 2 0
30 SDSS J094503.44+103600.2 LM* 09 45 03.43344 +10 36 01.1808           sdM8.5 1 0
31 SDSS J094552.72-003432.4 LM* 09 45 52.72536 -00 34 32.4192           dM5.0 1 0
32 SDSS J094905.25+023250.7 LM* 09 49 05.2665752544 +02 32 50.685678376           sdM5 3 0
33 WISE J100040.61+125611.3 LM* 10 00 40.67664 +12 56 10.5072           esdM6.5 1 0
34 SDSS J101200.28+204611.6 LM* 10 12 00.3968815690 +20 46 12.874079315           esdM8.0 4 0
35 SSSPM J1013-1356 LM* 10 13 07.3466815701 -13 56 21.261098713       18.73 16.01 sdM9.5 34 0
36 ULAS J101626.55+024106.9 LM* 10 16 26.5495364168 +02 41 06.788138325           sdM6.0 1 0
37 ULAS J101824.91+021511.7 LM* 10 18 24.97272 +02 15 12.4560           ~ 1 0
38 2MASS J10255227+3212349 BD* 10 25 52.27584 +32 12 34.9956           L9 13 0
39 WISE J102757.73+340143.6 LM* 10 27 57.7994870329 +34 01 48.993496857           sdM8.0-8.5 3 0
40 ULAS J102935.73+110901.5 LM* 10 29 35.8258043243 +11 09 01.728388207           ~ 1 0
41 ULAS J103218.45+011555.4 LM* 10 32 18.45384 +01 15 56.5128           usdM6.0-6.5 1 0
42 ULAS J103317.93+053054.1 LM* 10 33 18.00864 +05 30 54.9216           sdM7.0 1 0
43 2MASS J10332186+4005499 BD* 10 33 21.86712 +40 05 49.9272           L6 9 0
44 ULAS J103658.90+033620.6 LM* 10 36 58.89408 +03 36 23.1624           sdM6.5-7.0 1 0
45 ULAS J103735.73+113248.8 LM* 10 37 35.7897607131 +11 32 49.968900752           sdM5.0-5.5 1 0
46 ULAS J104206.20+092318.9 LM* 10 42 06.1685786052 +09 23 20.430655711           dM6.0 1 0
47 LP 550-245 LM* 10 43 09.0532622695 +05 21 12.321133961   21.4   19.3   ~ 2 0
48 SDSS J104410.01+300142.3 LM* 10 44 10.1130308926 +30 01 43.103128660           esdM7.0-7.5 3 0
49 ULAS J104451.47-014635.2 LM* 10 44 51.51744 -01 46 34.1328           esdM5.0 1 0
50 SDSS J104657.92-013746.3 LM* 10 46 57.9239001247 -01 37 46.245634098           dM4.5/sdM5.0 1 0
51 ULAS J104753.42+145940.4 LM* 10 47 53.45208 +14 59 42.0072           ~ 1 0
52 SDSS J105012.58+085122.6 LM* 10 50 12.5692094825 +08 51 23.546349294           sdM7.0 2 1
53 SDSS J105102.32+133346.9 LM* 10 51 02.3557411331 +13 33 47.592558498           sdM7.5 3 0
54 ULAS J105309.94+131428.9 LM* 10 53 09.89592 +13 14 30.1020           esdM5.0 1 0
55 SDSS J105703.59+064850.5 LM* 10 57 03.5588923973 +06 48 51.270000515           sdM6.0 2 0
56 ULAS J110017.78+011217.6 LM* 11 00 17.81616 +01 12 18.6552           sdM7.0 1 0
57 TYC 268-395-1 * 11 04 01.3118347978 +06 04 45.012540331   11.30 10.28     ~ 1 0
58 ULAS J110421.84+053722.9 LM* 11 04 21.85944 +05 37 23.9988           usdM4.5-5.0 1 0
59 2MASS J11065132+0448152 LM* 11 06 51.2924294794 +04 48 15.185113044           sdM6.0 4 0
60 WISE J111147.20+272515.0 LM* 11 11 47.1514249797 +27 25 17.863873477           esdM5.5 2 0
61 ULAS J111358.79+031136.9 LM* 11 13 58.73424 +03 11 37.7268           sdM6.0 1 0
62 ULAS J111447.17-015724.4 LM* 11 14 47.2818481832 -01 57 23.331871535           ~ 1 0
63 ULAS J111453.43+122915.7 LM* 11 14 53.3125810283 +12 29 20.441976364           ~ 1 0
64 LSPM J1118+0941W LM* 11 18 14.6669610756 +09 41 13.286918224   20.6   19.3   dM2.0 4 0
65 SDSS J111929.19+672104.0 LM* 11 19 29.1875691041 +67 21 04.087267727           sdM5.0-5.5 1 0
66 ULAS J113844.56+065409.2 LM* 11 38 44.6737081636 +06 54 10.386247659           esdM5.5 1 0
67 ULAS J114001.12+003703.3 LM* 11 40 01.18824 +00 37 03.9972           ~ 1 0
68 ULAS J114328.22+112220.5 LM* 11 43 28.17576 +11 22 21.9468           sdM5.5-6.0 1 0
69 SDSS J114442.54+155105.8 LM* 11 44 42.5242368075 +15 51 06.703608966           sdM6.0 2 0
70 ULAS J121356.93-025526.7 LM* 12 13 56.96424 -02 55 25.5288           ~ 1 0
71 SDSS J121812.86+070610.4 LM* 12 18 12.9376885200 +07 06 10.572192777           sdM6 4 0
72 LSR J1227+2512 LM* 12 27 42.1019879340 +25 12 58.574302746   20.6   18.6   sdM6.0-6.5 6 0
73 ULAS J124410.06+273624.7 BD* 12 44 10.10832 +27 36 25.8408           sdL0.0 2 0
74 ULAS J124904.40+100412.1 LM* 12 49 04.3738420410 +10 04 13.939350999           sdM7.0 1 0
75 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1020 0
76 ULAS J125134.40-005556.7 LM* 12 51 34.44528 -00 55 55.5168           sdM8.0 1 0
77 LSPM J1255+3414 LM* 12 55 51.6336527744 +34 14 22.282199061       19.5   esdM5.5 3 0
78 SDSS J125930.63+131634.2 LM* 12 59 30.63576 +13 16 34.2300           sdM6.0 1 0
79 ULAS J130615.22+045905.8 LM* 13 06 15.1966492485 +04 59 09.300196737           sdM7.0 1 0
80 ULAS J130959.51+052938.5 LM* 13 09 59.59872 +05 29 38.7384           sdM6.5 1 0
81 ULAS J131038.47+333910.3 LM* 13 10 38.4553857552 +33 39 12.670550654           sdM6.0 1 0
82 ULAS J131822.69-011149.8 LM* 13 18 22.81968 -01 11 50.0964           esdM8.0 1 0
83 ULAS J132012.11+053943.6 LM* 13 20 12.18912 +05 39 44.0424           esdM7.5 1 0
84 SDSS J132737.53+345103.6 LM* 13 27 37.6034765957 +34 51 03.674156185           sdM5.5 2 0
85 ULAS J132741.67-012916.4 LM* 13 27 41.75856 -01 29 15.7560           M6.0 1 0
86 ULAS J132823.25+302144.8 LM* 13 28 23.4387031142 +30 21 44.892649350           sdM7.0 1 0
87 ULAS J134555.24+022247.3 LM* 13 45 55.2526099031 +02 22 49.444501144           esdM7.0-7.5 1 0
88 WISE J135053.29+235023.9 LM* 13 50 53.40048 +23 50 24.3456           sdM7.0 2 0
89 ULAS J135058.86+081506.8 BD* 13 50 58.86 +08 15 06.8           L5 9 0
90 LSPM J1351+5506 LM* 13 51 28.5878705052 +55 06 57.445034404   21.3   18.8   esdM7.0 4 0
91 LP 559-2 LM* 13 55 28.3755482680 +06 51 18.451873588   20.2   18.0   sdM5.5 2 0
92 2MASS J14101119+1329008 BD* 14 10 11.19216 +13 29 00.8124           L4 4 0
93 ULAS J141405.67-014204.0 BD* 14 14 05.66928 -01 42 03.7476           sdL0.5 1 0
94 2MASS J14222720+2215575 BD* 14 22 27.20808 +22 15 57.5424           L5 9 0
95 LSPM J1425+7102 LM* 14 25 05.0227940507 +71 02 09.678947111   20.8   18.61 16.21 sdM8 29 0
96 ULAS J143013.12+012018.3 LM* 14 30 13.19472 +01 20 19.0788           usdM6.5 1 0
97 BD+39 2777 * 14 33 53.1261315910 +38 40 48.472233766   9.86 9.35     F5 2 0
98 BD+39 2778 * 14 33 58.2268519114 +38 56 21.958687834   9.76 8.21     K5 4 0
99 SDSS J143434.00+384103.4 LM* 14 34 33.9991500726 +38 41 03.455730558           sdM5.5 1 0
100 2MASS J14353572-0043471 BD* 14 35 35.72880 -00 43 47.1000           L2V 14 0
101 LP 440-52 LM* 14 39 00.3087274496 +18 39 38.704121134   19.6 18.39 17.3 14.64 sdM7.0 58 0
102 ULAS J144128.38+003119.6 LM* 14 41 28.38368 +00 31 21.2896           esdM5.5 1 0
103 ULAS J144729.80-015950.8 LM* 14 47 29.91456 -01 59 50.3376           sdM/dM6.5 1 0
104 2MASSW J1449378+235537 BD* 14 49 37.8571494644 +23 55 37.912424357           L0V 13 0
105 ULAS J145743.38+012745.6 LM* 14 57 43.4433139443 +01 27 47.416846965         18.19 esdM5.5 1 0
106 SDSS J151217.83-011233.9 LM* 15 12 17.8259483927 -01 12 34.406743536           sdM7.0 4 0
107 LP 502-32 LM* 15 20 29.4629312559 +14 34 39.188431804   21.1   18.5   esdM5.0 20 0
108 ULAS J152434.51+002057.2 LM* 15 24 34.6260908194 +00 20 57.903070714           sdM7.0 1 0
109 LP 223-10 LM* 15 25 35.9108643906 +43 15 45.967118808   20.5   18.2   sdM4.0 4 0
110 ULAS J152539.91+002408.9 LM* 15 25 39.9607432115 +00 24 09.715069685           sdM5.5-6.0 1 0
111 ULAS J153241.81+024143.7 LM* 15 32 41.87352 +02 41 46.0032           usdM6.0 1 0
112 SDSS J153647.08+025501.5 LM* 15 36 47.0869898844 +02 55 01.582802088           esdM6 4 0
113 SDSS J154128.39+041004.6 LM* 15 41 28.4218612021 +04 10 05.246764459           sdM6.0 1 0
114 ULAS J154143.74+012630.5 LM* 15 41 43.8126165246 +01 26 31.393893389           sdM6.0/esdM5.5 1 0
115 LP 803-27 LM* 15 45 40.2078778816 -20 36 16.697685091     16.57     sdM5.0 20 0
116 ULAS J154828.30+001809.6 LM* 15 48 28.37352 +00 18 10.4544           esdM6.0 1 0
117 SDSS J160519.49+030534.2 LM* 16 05 19.4921284629 +03 05 34.305288138           dM4.0-5.0 1 0
118 2MASS J16262034+3925190 BD* 16 26 20.1331562643 +39 25 19.489643721       19.67 16.68 esdL4 44 0
119 SDSS J164008.57+110322.7 LM* 16 40 08.6252464958 +11 03 23.016330823           sdM5.0-5.5 1 0
120 LSPM J1657+3939 LM* 16 57 39.5952268264 +39 39 48.006502551   20.9   19.1   sdM6.5 4 0
121 LP 141-1 LM* 18 45 52.2452564851 +52 27 40.623179319   16.96   13.9   sdM4.5 43 0
122 LP 969-24 LM* 19 44 22.0342010509 -22 30 54.052504831   19.1 17.24     sdM4.0 13 0
123 LSPM J2036+5100 LM* 20 36 21.6141972503 +51 00 04.698980889       17.46 15.26 sdM7.5 24 1
124 SDSS J205819.76+000103.8 LM* 20 58 19.7223137879 +00 01 03.639158555           sdM/dM6.5 1 0
125 LP 758-60 PM* 21 55 47.9570681233 -11 21 42.776418480   19.4 17.40     esdM5 23 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2017A&A...598A..92L and select 'bookmark this link' or equivalent in the popup menu


2020.07.04-15:37:24

© Université de Strasbourg/CNRS

    • Contact