2009A&A...499..729L


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST22:45:24

2009A&A...499..729L - Astronomy and Astrophysics, volume 499, 729-736 (2009/6-1)

Lucky imaging of M subdwarfs.

LODIEU N., ZAPATERO OSORIO M.R. and MARTIN E.L.

Abstract (from CDS):

The knowledge of the binary properties of metal-poor and solar-metallicity stars can shed light on the potential differences between the formation processes responsible for both types of objects. The aim of the project is to determine the binary properties (separation, mass ratio, frequency of companions) for M subdwarfs, the low-metallicity counterparts of field M dwarfs, and investigate any potential differences between both populations. We have obtained high-resolution imaging in the optical for a sample of 24 early-M subdwarfs and nine extreme subdwarfs with the ``Lucky Imaging'' technique using the AstraLux instrument on the Calar Alto 2.2-m telescope. We are sensitive to companions at separations larger than 0.1 arcsec and differences of ∼2mag at 0.1arcsec and ∼5mag at 1arcsec. We have found no companion around the 24 subdwarfs under study and one close binary out of nine extreme subdwarfs. A second image of LHS182 taken three months later with the same instrument confirms the common proper motion of the binary separated by about 0.7arcsec. Moreover, we do not confirm the common proper motion of the faint source reported by Riaz and collaborators at ∼2arcsec from LHS1074. We derive a binary frequency of 3±3% for M subdwarfs from our sample of 33 objects for separations larger than about five astronomical units. Adding to our sample the additional 28 metal-poor early-M dwarfs observed with the Hubble Space Telescope by Riaz and collaborators, we infer a binary fraction of 3.7±2.6% (with a 1σ confidence limit), significantly lower than the fraction of resolved binary M dwarfs (∼20%) over the same mass and separation ranges. This result suggests a sharp cut-off in the multiplicity fraction from G to M subdwarfs, indicating that the metallicity plays a role at lower masses and/or an environmental effect governing the formation of metal-poor M dwarfs compared to their metallicity counterparts.

Abstract Copyright:

Journal keyword(s): methods: observational - techniques: photometric - Galaxy: halo - stars: binaries: general - stars: low-mass, brown dwarfs - infrared: stars

Simbad objects: 43

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Number of rows : 43

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 NGC 104 GlC 00 24 05.359 -72 04 53.20   5.78 4.09     ~ 3548 0
2 LP 645-78 PM* 00 25 51.2102376823 -07 48 07.973319514   20.6       M7.9V 17 0
3 2MASS J01574055+5308134 PM* 01 57 40.6327791748 +53 08 13.395791750   13.8       sdM3.5 7 0
4 Wolf 110 LM* 02 02 52.1476775862 +05 42 20.953886651   13.69   11.845   sdM0.0 55 0
5 G 4-29 LM* 02 34 12.4533446129 +17 45 50.514364811   16.590 14.911 13.852 12.612 esdM3 28 0
6 G 76-39 LM* 02 52 45.5138666139 +01 55 50.575567957   16.27 14.73 13.5 12.73 esdM2.0 33 0
7 L 802-6 PM* 02 58 10.2285414990 -12 53 06.000158836   14.40 12.669 12.258   sdM3.0 37 0
8 Ross 585 PM* 03 30 44.80608 +34 01 07.3524   14.0   12.26   sdM0.5 36 0
9 Ross 578 LM* 03 38 15.6980969811 -11 29 13.501299941   14.67 13.02     sdM2.5 56 0
10 Wolf 1057 LM* 03 42 29.4265322441 +12 31 33.585218610   14.46 12.841 12.466   sdM1.5 40 0
11 2MASS J03425369+5527308 PM* 03 42 53.7334273237 +55 27 30.439105987   16.6   14.9   sdM0.0 6 0
12 G 79-69 ** 03 46 24.579048 +11 43 11.85420   16.39 14.90 14.65   ~ 13 0
13 G 95-59 LM* 03 50 13.88544 +43 25 40.6416       13.34   esdM0.0 35 0
14 G 7-17 LM* 04 01 36.5894590926 +18 43 39.936102062   17.35       esdM0.5 42 0
15 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3479 0
16 G 86-27 PM* 05 10 31.3991086399 +31 17 35.358953221   15.8   14.3   ~ 12 0
17 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 1977 1
18 NAME Trapezium Cluster As* 05 35 16.5 -05 23 14           ~ 1467 1
19 G 99-33 LM* 05 48 00.2060027002 +08 22 14.081003745   15.57   13.4   sdM0.0 20 0
20 WISEA J061852.63+161449.4 PM* 06 18 52.5229744957 +16 14 56.098239240   16.7   14.5 12.9 sdM2.0 7 0
21 LP 540-16 LM* 06 27 33.3067649078 +06 16 58.842066409   17.3   15.4   esdM1.5 9 0
22 2MASS J07054876+0506171 PM* 07 05 48.7629646819 +05 06 17.121409710   18.4   14.1   sdM3.5 8 0
23 G 46-40 PM* 09 25 31.0851825602 +00 18 17.681141916   16.61   14.0   sdM0.5 17 0
24 LP 607-65 PM* 09 25 31.2905436913 +00 18 23.579297048   19.0   17.6   ~ 12 0
25 G 176-40 LM* 11 32 45.3366003413 +43 59 42.520997600   16.0   14.1   sdM0.5 23 0
26 Ross 451 LM* 11 40 20.3054683893 +67 15 32.361929733   12.291   11.2   sdM0.0 59 0
27 G 121-45 PM* 12 02 18.000648 +28 35 14.10900   14.70   12.45   sdM3.5 50 1
28 G 11-35 LM* 12 02 33.6593915754 +08 25 50.731714280   15.58   13.2   sdM2.0 27 0
29 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 2997 0
30 G 165-47 LM* 14 06 55.5868589230 +38 36 56.042322347   16.24   13.7   esdM1.5 41 0
31 LSPM J1755+1648 PM* 17 55 32.7617153735 +16 48 58.896345464   17.0   14.8   sdM3.5 12 0
32 LP 24-219 LM* 18 21 52.9574409976 +77 09 30.022413101   18.0   15.9   esdM2.5 27 0
33 LP 141-1 LM* 18 45 52.2452564851 +52 27 40.623179319   16.96   13.9   sdM4.5 43 0
34 LSR J1914+2825A PM* 19 14 05.5011124884 +28 25 52.326484036   17.0   15.4   sdM0.0 4 0
35 G 143-8 LM* 19 46 48.6286903212 +12 04 59.076762664   15.82   13.9   sdM1.0 21 0
36 Wolf 1130 Er* 20 05 02.1949477691 +54 26 03.227818091   11.970 13.883     sdM1.5 120 0
37 LSPM J2009+5659 PM* 20 09 33.7935302539 +56 59 25.766885391   16.8   14.6   sdM2.0 8 0
38 2MASS J20093416+5659301 * 20 09 34.1745472306 +56 59 30.319561927           ~ 1 0
39 LP 515-3 LM* 20 19 04.5756355023 +12 35 04.034763292   16.5   14.8   esdM0.0 27 0
40 G 210-19 LM* 20 27 29.0848219064 +35 59 24.806448054   16.39   14.0   sdM1.5 31 0
41 Wolf 1106 LM* 21 07 55.3982490752 +59 43 19.333058456   14.85   13.7   sdM1.5 52 0
42 LSPM J2205+5807 PM* 22 05 32.6469607019 +58 07 25.431016964   17.9   17.5   esdM1.0 4 0
43 G 128-34 LM* 23 08 26.0376000260 +31 40 23.802925570   16.19   13.8   esdM0.5 26 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-22:45:24

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