2015ApJ...801..113M


Query : 2015ApJ...801..113M

2015ApJ...801..113M - Astrophys. J., 801, 113 (2015/March-2)

A new class of nascent eclipsing binaries with extreme mass ratios.

MOE M. and DI STEFANO R.

Abstract (from CDS):

Early B-type main-sequence (MS) stars (M1~ 5-16 M) with closely orbiting low-mass stellar companions (q = M2/M1< 0.25) can evolve to produce Type Ia supernovae, low-mass X-ray binaries, and millisecond pulsars. However, the formation mechanism and intrinsic frequency of such close extreme mass-ratio binaries have been debated, especially considering none have hitherto been detected. Utilizing observations of the Large Magellanic Cloud galaxy conducted by the Optical Gravitational Lensing Experiment, we have discovered a new class of eclipsing binaries in which a luminous B-type MS star irradiates a closely orbiting low-mass pre-MS companion that has not yet fully formed. The primordial pre-MS companions have large radii and discernibly reflect much of the light they intercept from the B-type MS primaries (ΔIrefl~ 0.02-0.14 mag). For the 18 definitive MS + pre-MS eclipsing binaries in our sample with good model fits to the observed light-curves, we measure short orbital periods P = 3.0-8.5 days, young ages τ ~ 0.6-8 Myr, and small secondary masses M2~ 0.8-2.4 M(q ~ 0.07-0.36). The majority of these nascent eclipsing binaries are still associated with stellar nurseries, e.g., the system with the deepest eclipse ΔI1= 2.8 mag and youngest age τ = 0.6±0.4 Myr is embedded in the bright H II region 30 Doradus. After correcting for selection effects, we find that (2.0±0.6)% of B-type MS stars have companions with short orbital periods P = 3.0-8.5 days and extreme mass ratios q ~ 0.06-0.25. This is ~10 times greater than that observed for solar-type MS primaries. We discuss how these new eclipsing binaries provide invaluable insights, diagnostics, and challenges for the formation and evolution of stars, binaries, and H II regions.

Abstract Copyright:

Journal keyword(s): binaries: close - binaries: eclipsing - H II regions - stars: formation - stars: massive - stars: pre-main sequence

Simbad objects: 82

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Number of rows : 82
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 [DCO2008] T-And0-00920 EB* 01 17 30.6889026336 +47 03 31.497970104   11.96 10.95 10.360   ~ 2 0
2 * bet Per EB* 03 08 10.1324535 +40 57 20.328013 1.70 2.07 2.12 2.08 2.11 B8V 1185 1
3 OGLE LMC-ECL-1500 EB* 04 50 48.8097202128 -69 51 48.621460860     18.017   17.848 ~ 4 0
4 OGLE LMC-ECL-1675 EB* 04 51 30.83 -69 22 45.0     17.296   17.258 ~ 4 0
5 OGLE LMC-ECL-1803 EB* 04 51 58.2209940048 -66 56 59.968752756     16.951   17.026 ~ 4 0
6 NGC 1714 EmO 04 52 08.4 -66 55 23   11.51 11.61     ~ 82 2
7 OGLE LMC-ECL-1965 EB* 04 52 34.9024381128 -69 42 24.695935128     17.120   17.210 ~ 4 0
8 HD 268680 * 04 53 03 -68 03.1   12.9       N 7 0
9 NGC 1736 EmO 04 53 03.7239890448 -68 03 05.101346628   15.5       ~ 18 0
10 OGLE LMC-ECL-2139 EB* 04 53 05.1635789088 -68 03 03.314180808     16.343 16.424 16.490 ~ 5 0
11 NAME LMC 7 Supergiant Shell HII 04 53 41 -69 35.2           ~ 25 0
12 LHA 120-N 11 HII 04 56 51.4 -66 24 24           ~ 247 0
13 OGLE LMC-ECL-3972 EB* 04 57 47.21 -69 34 58.7     17.926   17.869 ~ 4 0
14 OGLE LMC-ECL-5205 EB* 05 01 16.1061251592 -67 51 29.014289532     16.619 16.56 16.656 ~ 6 0
15 OGLE LMC-SC15 152509 EB* 05 01 44.99 -68 53 43.2     17.230 17.33 17.336 ~ 5 0
16 Shapley VIII As* 05 02 31 -70 23.9           ~ 8 0
17 OGLE LMC-SC14 15972 EB* 05 02 43.52 -69 16 14.2     17.240 16.95 17.270 ~ 6 0
18 OGLE LMC-ECL-5898 EB* 05 02 58.7241670632 -70 49 44.839073496     16.651 16.66 16.704 ~ 7 0
19 BSDL 552 ISM 05 04 39 -70 06.3           ~ 4 0
20 OGLE LMC-ECL-6630 EB* 05 04 39.43 -70 07 33.3     17.075   17.091 ~ 4 0
21 DEM L 68 HII 05 05 13 -70 07.0           ~ 13 0
22 OGLE LMC-ECL-7419 EB* 05 06 21.436 -70 28 27.55     16.614   16.487 ~ 4 0
23 DEM L 76 HII 05 06 45.3 -68 26 34           ~ 11 0
24 BSDL 657 ISM 05 07 16 -68 27.8           ~ 3 0
25 OGLE LMC-SC13 261233 EB* 05 07 17.9695789920 -68 28 03.805141836     17.887 18.00 17.936 ~ 7 0
26 OGLE LMC-ECL-9002 EB* 05 10 04.18 -70 35 25.0     17.873 17.918 17.976 ~ 6 0
27 OGLE LMC-ECL-9642 EB* 05 11 46.29 -67 46 25.1 17.472 17.646 17.977 17.940 17.864 ~ 6 0
28 [SL63] 320 Cl* 05 13 18 -69 22.2   10.14 10.34     ~ 7 2
29 NGC 1876 Cl* 05 13 19.04 -69 21 44.5           ~ 18 0
30 OGLE J051324.03-692137.4 EB* 05 13 23.92 -69 21 37.3     16.721   16.815 ~ 5 0
31 OGLE LMC-ECL-10941 EB* 05 14 59.23 -69 12 19.7     17.549   17.568 ~ 4 0
32 OGLE LMC-ECL-11731 EB* 05 16 57.75 -69 03 28.1     16.762   16.803 ~ 4 0
33 OGLE LMC-SC8 279275 EB* 05 17 04.79 -69 42 06.8   17.54 17.720 17.47 17.745 ~ 6 0
34 * 17 Aur EB* 05 18 18.8960529504 +33 46 02.516925540   6.102 6.144     B9V+B9.5V 295 0
35 OGLE LMC-ECL-12528 EB* 05 18 52.32 -69 18 02.6     17.774   17.740 ~ 4 0
36 OGLE LMC-ECL-13194 EB* 05 20 34.14 -70 05 34.8     17.847   17.800 ~ 4 0
37 OGLE LMC-ECL-13721 EB* 05 21 51.3893951520 -71 26 31.452126720     17.711   17.808 ~ 4 0
38 LHA 120-N 200 EmO 05 22 13.1 -71 26 10           ~ 23 0
39 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16284 1
40 OGLE LMC-ECL-15306 EB* 05 25 31.71 -69 51 38.7     17.891   17.922 ~ 4 0
41 NAME LMC 9 Supergiant Shell sh 05 25 46 -71 09.3           ~ 24 0
42 LHA 120-N 144B EmO 05 26 32 -68 48.8           ~ 11 0
43 OGLE LMC-ECL-15761 EB* 05 26 35.54 -68 48 35.7   16.14 16.253 16.232 16.475 ~ 8 0
44 OGLE LMC-ECL-15792 EB* 05 26 37.37 -68 50 09.2   16.41 16.588   16.702 ~ 5 0
45 LH 58 As* 05 26 45 -68 49.9   7.97 7.96     ~ 58 0
46 NGC 1970 ISM 05 26 49 -68 49.7   10.45 10.28     ~ 17 0
47 Shapley II As* 05 27 53 -68 57.2           ~ 6 0
48 OGLE LMC-ECL-16828 EB* 05 28 40.4058239064 -68 46 42.801374388     16.453   16.610 ~ 4 0
49 OGLE LMC-ECL-17217 EB* 05 29 27.6888797280 -68 48 09.932301828     16.414   16.535 ~ 4 0
50 OGLE LMC-ECL-17387 EB* 05 29 49.2795103008 -68 56 17.558876472     15.974   16.148 ~ 4 0
51 NAME LMC 3 Supergiant Shell sh 05 30 26 -69 07.9           ~ 70 0
52 OGLE LMC-SC2 92546 EB* 05 30 26.3304236328 -69 35 09.501003132     17.339 17.51 17.332 ~ 6 0
53 BSDL 2159 ISM 05 31 37 -68 35.0           ~ 3 0
54 OGLE LMC-ECL-18330 EB* 05 31 44.9554664160 -68 34 52.534836624   16.04 16.065 16.15 16.078 ~ 6 0
55 OGLE LMC-ECL-18419 EB* 05 31 55.78 -71 13 32.0   16.53 16.579 16.85 16.713 ~ 5 0
56 LHA 120-N 148 HII 05 32 10.9 -68 28 23           ~ 33 0
57 LHA 120-N 206D EmO 05 32 21 -71 13.8           ~ 6 0
58 OGLE LMC-ECL-19186 EB* 05 33 38.36 -70 02 49.9     17.697   17.688 ~ 4 0
59 * tet01 Ori B EB* 05 35 16.1339860056 -05 23 06.784444248 7.71 8.20 7.96     B1V 358 2
60 M 42 HII 05 35 17.3 -05 23 28           ~ 3939 0
61 Brun 691 Y*O 05 35 26.8853297688 -04 47 30.733969452   13.3 12.29   11.08 K0-K2 26 0
62 LH 96 As* 05 37 15 -69 29.2           ~ 24 0
63 DEM L 261 HII 05 37 43.0 -69 22 03           ~ 15 0
64 OGLE LMC-ECL-21025 EB* 05 37 45.7432266648 -69 25 38.864783532     16.661   16.764 ~ 4 0
65 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 210 0
66 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1121 2
67 NGC 2070 Cl* 05 38 42 -69 06.0     7.25     ~ 353 1
68 OGLE LMC-ECL-21452 EB* 05 38 43.99 -69 05 29.6     17.481   17.315 ~ 4 0
69 NGC 2074 As* 05 39 03 -69 29.9           ~ 60 0
70 OGLE LMC-ECL-21641 EB* 05 39 10.99 -69 29 20.2     16.602 16.514 16.713 ~ 5 0
71 LHA 120-N 158 HII 05 39 11.220 -69 30 13.65           ~ 82 0
72 LHA 120-N 159 HII 05 39 46.650 -69 45 39.94           ~ 267 2
73 OGLE LMC-ECL-21859 EB* 05 39 49.5667538208 -70 09 58.640987196   16.17 16.131 16.28 16.128 ~ 5 0
74 OGLE LMC-ECL-21975 EB* 05 40 03.8543247552 -69 45 32.307803748     16.326   16.195 ~ 5 0
75 NGC 2084e ? 05 40 06 -69 45.9     11.38     ~ 5 0
76 OGLE LMC-ECL-23981 EB* 05 46 07.6269420360 -67 49 48.837646092     16.904   16.816 ~ 4 0
77 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1703 0
78 * 9 Cha EB* 08 43 12.1984130688 -79 04 12.368512452   6.28 6.07     A7V 220 0
79 V* TY CrA Ae* 19 01 40.8284458320 -36 52 33.816176040 10.03 9.92 9.39     B9e 279 0
80 V* V515 Lyr EB* 19 20 33.2921313572 +37 48 16.366712433   20.386 19.449 18.843 18.16 ~ 9 0
81 NGC 6791 OpC 19 20 53 +37 46.7   10.52 9.5     ~ 973 0
82 V* EK Cep EB* 21 41 21.5042268336 +69 41 34.112933916   7.95 7.89     A0V 207 0

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2022.10.07-04:32:57

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