2007A&A...462L..61C


Query : 2007A&A...462L..61C

2007A&A...462L..61C - Astronomy and Astrophysics, volume 462, L61-64 (2007/2-2)

The widest ultracool binary.

CABALLERO J.A.

Abstract (from CDS):

I test the ejection scenario for the formation of brown dwarfs and low-mass stars through the detection of a very wide ultracool binary. LEHPM 494 (M6.0±1.0V) and DENIS-P J0021.0-4244 (M9.5±0.5V) are separated by 1.3arcmin and are high proper motion co-moving ultracool stars. I have used six astrometric epochs spaced by 22 years to confirm their common tangential velocity. The angular separation between both low-mass stars remains constant with an uncertainty of less than 0.1%. I have also derived their most probable heliocentric distance (23±2pc), age interval (2-10Ga) and masses (0.103±0.006 and 0.079±0.004M). The pair, with a projected physical separation of 1800±170AU, is by far the widest ultracool binary yet found in the field. This serendipitous and simple detection is inconsistent with ultra low-mass formation ejection scenarios and complements current searches for low-mass tight binaries.

Abstract Copyright:

Journal keyword(s): stars: low-mass, brown dwarfs - stars: binaries: general - stars: individual: DENIS-P J0021.0-4244 - stars: formation - stars: individual: LEHPM 494 - stars: binaries: visual

Nomenclature: Table 1: Koenigstuhl NA (Nos 1, 1A, 1B)

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 L 362-29 PM* 00 04 36.4375346731 -40 44 02.880162313   14.47 12.84 12.525   M4V 73 0
2 Koenigstuhl 1B BD* 00 21 05.9180929272 -42 44 43.525081140       19.46 16.79 L0.6:V 25 0
3 Koenigstuhl 1A PM* 00 21 10.7415621912 -42 45 40.169294748         13.92 M6 14 0
4 V* DY Psc BY* 00 24 24.6317407560 -01 58 19.954412004     19.42 17.301 15.022 M9.5V 198 1
5 2MASS J05383888-0228016 Y*O 05 38 38.8901286864 -02 28 01.718651352 20.95 21.83   18.77 16.99 M5Ve 24 0
6 [BZR99] S Ori 68 BD* 05 38 39.1 -02 28 05         23.77 L5: 24 1
7 NAME sigma Orionis Cluster MGr 05 38 42 -02 36.0           ~ 525 0
8 G 51-15 Er* 08 29 49.3527921926 +26 46 33.624143059   16.87   14.736   M6.5Ve 271 0
9 LP 666-9 LM* 08 53 36.1604798120 -03 29 32.197505547     18.959 16.781 14.487 M9Ve 238 0
10 HJM C 6-2 Y*O 11 10 28.5085562328 -77 16 59.595145932     17.93   13.97 M3Ve 31 0
11 HD 97334 BY* 11 12 32.3503039560 +35 48 50.688978228   7.02   6.0   G2 270 0
12 NAME Proxima Centauri Er* 14 29 42.9461331854 -62 40 46.164680672 14.21 12.95 11.13 9.45 7.41 M5.5Ve 1142 0
13 G 124-62 PM* 14 41 35.8329036192 -09 46 38.701925184   12.58 11.80 12.33   dM4.5e 23 0
14 * eps Ind PM* 22 03 21.6536261624 -56 47 09.522795714   5.75 4.69     K5V 510 0

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2022.08.09-03:08:46

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