2000A&A...360..997T

Query : 2000A&A...360..997T

2000A&A...360..997T - Astronomy and Astrophysics, volume 360, 997-1002 (2000/8-3)

On the origin of binaries with twin components.

TOKOVININ A.A.

Abstract (from CDS):

The existence of a statistically significant excess of dwarf binaries with mass ratios from 0.95 to 1, as first noted by Lucy & Ricco (1979AJ.....84..401L), is confirmed by modern data. Excess of such binaries, called twins, is found only for periods shorter than 40 days, and in the 2-30 days period range they constitute 10-20% of the total binary population. Twins must have been formed by a special mechanism. It cannot be a mass transfer in contact pre-main-sequence binaries, fission is also unlikely. As shown by Bate (2000MNRAS.314...33B), accretion onto a close binary shifts mass ratio towards 1, so twins may originate from binaries that became close while still surrounded by massive envelopes. Many twins are members of higher-multiplicity systems and/or clusters, which probably explains an early formation of a close binary by stellar dynamics.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: close - stars: binaries: general - stars: formation

CDS comments: Table 1 : Numbers 2879 and 2918 are HR, HD 184865 and 184866 misprint for HD 166865, 166866, SBC8 1017 = MM Her, SBC8 1434 = EZ Peg.

Simbad objects: 57

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Number of rows : 57
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 483 SB* 00 09 19.4436350616 +17 32 02.119084656 7.870 7.690 7.050     G2III 52 0
2 HD 895C SB* 00 13 22.9857437400 +26 59 02.163195240   10.80 10.01 10.11   ~ 8 1
3 HD 2942B SB* 00 32 49.3222684776 +28 16 40.830886596   12.09 11.26     ~ 5 1
4 HD 3266 ** 00 36 02.36294 +29 59 34.8139           G4V 75 0
5 HD 3443 SB* 00 37 20.71960 -24 46 02.1843   6.28 5.57     K1V+G 237 0
6 * 64 Psc SB* 00 48 58.7075574408 +16 56 26.324381004   5.58   4.8   F8V 136 0
7 HD 6645B SB* 01 07 50.0775039336 +46 50 24.728135748   11.04 10.25     F8V 4 0
8 HD 8624 SB* 01 25 38.5499166648 +31 32 46.194343548       7.5   G0 43 0
9 BD+48 476 SB* 01 36 01.3066531416 +49 42 42.711811560       9.9   F7 27 0
10 * 66 Cet SB* 02 12 47.5413483242 -02 23 37.066624087   6.21 5.66     F8V 135 0
11 * eps Cet SB* 02 39 33.7974128402 -11 52 19.551632148   5.33 4.87     F5V 204 0
12 HD 17841 SB* 02 53 01.4805252028 +35 38 13.516169021       7.8   G9 37 0
13 HD 20039 SB* 03 18 38.5002297504 +72 16 30.442783335       8.4   G6 61 0
14 AG+24 306 SB* 03 34 27.9696232896 +24 28 05.094838596   10.06 9.64 9.90   ~ 7 1
15 HD 22403 PM* 03 37 11.0381580962 +25 59 27.954176922       6.9   G4 122 0
16 V* DQ Tau Or* 04 46 53.0575226016 +17 00 00.136127304 14.56 13.67 12.00 13.21   M1Ve 338 0
17 HD 32093 SB* 05 01 46.3235378640 +26 39 02.665243368   8.87 8.17     G5 37 0
18 HD 35317 ** 05 23 51.32963 -00 51 59.8576           F7V+F8V 90 0
19 G 86-40 SB* 05 26 36.4561162392 +34 44 46.591969416   12.3   11.5   sdG0 23 0
20 * psi02 Ori bC* 05 26 50.2293232104 +03 05 44.422154160 3.45 4.398 4.611     B2IV 206 0
21 * phi01 Ori Y*O 05 34 49.2376273598 +09 29 22.510380606 3.29 4.26 4.41 4.42 4.59 B0III 258 0
22 HD 43358 SB* 06 15 53.9777633972 +01 10 08.833180521   6.79 6.36     F3V 94 0
23 * del Col SB* 06 22 06.8249488320 -33 26 11.036211216 5.25 4.73 3.85 3.18 2.71 G7II 82 0
24 V* IM Mon EB* 06 23 01.4692765176 -03 16 37.090499952   6.408 6.548     B3V 92 0
25 G 87-45 ** 07 32 58.6816206932 +31 06 59.493424824   12.07   10.6   ~ 22 0
26 HD 61994 SB* 07 47 30.5384617494 +70 12 24.198261184   7.78 7.08     G6V 93 0
27 * 9 Pup SB* 07 51 46.30295 -13 53 52.9169           G0V 243 0
28 BD+19 2077 SB* 08 41 09.6035844072 +19 51 18.661416948   11.361 10.631     G7.6 53 0
29 BD+19 2087 SB* 08 43 05.9392105920 +19 26 15.288202896   10.52 9.93     F8V 44 0
30 NGC 2682 88 SB* 08 51 13.6081464936 +11 50 38.121179748 13.152 12.97 12.180 11.931 11.545 G1IV 25 0
31 Cl* NGC 2682 SAND 999 RS* 08 51 18.6870620808 +11 47 02.715891216 13.632 13.38 12.569 12.143 11.69 ~ 90 0
32 NGC 2682 119 RS* 08 51 19.0167198768 +11 50 05.755781940 13.197 13.13 12.547 12.177 11.837 F9IV 81 0
33 Cl* NGC 2682 ES IV-4 SB* 08 51 22.9141132320 +11 48 49.440178944 13.245 13.27 12.695   12.033 F7IV 49 1
34 G 236-38 SB* 10 45 29.1439050960 +66 34 31.861177428   13.53   12.1   ~ 13 0
35 HD 98439 SB* 11 19 32.9378207760 -00 11 17.862016380   8.43 7.91     F8/G0V 30 0
36 HD 100831A PM* 11 36 35.6925545832 +56 08 07.275522912   8.33 7.65     G2V 41 0
37 HD 100831B SB* 11 36 35.8663727232 +56 08 01.106652048   8.86 8.08     G6V 33 1
38 HD 105287 SB* 12 07 07.5591167832 +69 04 34.718404260   8.72 8.21     G5 27 0
39 V* HZ Com RS* 12 29 40.9243367712 +24 31 14.635606188   10.58 9.76     G8:V 74 0
40 BD+21 2442 SB* 12 40 07.0400602154 +20 48 32.809208559   9.84 9.24 9.02   K2 48 0
41 Ross 1031 SB* 15 03 49.0061652360 +10 44 23.503068528   13.85 13.2 13.0   K0: 30 0
42 * eta CrB A * 15 23 12.230856 +30 17 17.56212   6.123 5.577     G2V 232 0
43 * sig CrB RS* 16 14 40.85557 +33 51 30.9497           F6V+G0V 493 0
44 HD 155555 RS* 17 17 25.5053342232 -66 57 03.732141636 7.795 7.499 6.723   6.39 G5V+K1V 273 1
45 HD 158614 SB* 17 30 23.79699 -01 03 46.4882 6.34     5.52   G9-IV-VHdel1 295 0
46 HD 163840 SB* 17 57 14.3391768182 +23 59 44.647993135   6.965 6.323     G2V+K2V 122 0
47 V* MM Her RS* 17 58 38.5191368904 +22 08 46.780356588   9.24 9.563 8.01 8.574 G0 136 0
48 V* BY Dra BY* 18 33 55.7720712062 +51 43 08.897780286 10.22 9.23   8.733   K4Ve+K7.5Ve 620 0
49 HD 189340 SB* 19 59 47.2802830338 -09 57 29.634435094   6.45 5.87     F9V 162 0
50 HD 191854 SB* 20 10 13.32676 +43 56 44.0669       8.05   G4V+G8V 111 0
51 V* Y Cyg SB* 20 52 03.5771840640 +34 39 27.486121104 6.31 7.23 7.32     O9.5IV+O9.5IV 371 1
52 HD 202908 ** 21 18 34.8830133696 +11 34 07.789280196   7.602 7.013     G0V+G6V 137 0
53 HD 203454 SB* 21 21 01.4163211656 +40 20 41.907079752   6.93   6.1   F8V 155 0
54 HD 213429 SB* 22 31 18.3282619654 -06 33 19.068890370   6.702 6.160     F8V 117 0
55 HD 214222 SB* 22 35 42.6711290705 +53 12 14.411224059   8.77 8.19     G1V 63 0
56 V* EZ Peg SB* 23 16 53.3489522040 +25 43 10.169817168   10.440 9.637 9.346 8.382 G5V(e) 67 0
57 V* KT Peg RS* 23 39 30.9712062189 +28 14 47.415889813   7.71   6.6   G8 96 0

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