2013ApJ...763..101L


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.28CET11:12:04

2013ApJ...763..101L - Astrophys. J., 763, 101 (2013/February-1)

The initial mass function of field OB stars in the Small Magellanic Cloud.

LAMB J.B., OEY M.S., GRAUS A.S., ADAMS F.C. and SEGURA-COX D.M.

Abstract (from CDS):

Some theories of star formation suggest massive stars may only form in clustered environments, which would create a deficit of massive stars in low-density environments. Observationally, Massey finds such a deficit in samples of the field population in the Small and Large Magellanic Clouds, with an initial mass function (IMF) slope of ΓIMF∼ 4. These IMF measurements represent some of the largest known deviations from the standard Salpeter IMF slope of ΓIMF= 1.35. Here, we carry out a comprehensive investigation of the mass function above 20 M for the entire field population of the Small Magellanic Cloud (SMC), based on data from the Runaways and Isolated O Type Star Spectroscopic Survey of the SMC (RIOTS4). This is a spatially complete census of the entire field OB star population of the SMC obtained with the IMACS multi-object spectrograph and MIKE echelle spectrograph on the Magellan telescopes. Based on Monte Carlo simulations of the evolved present-day mass function, we find the slope of the field IMF above 20 M is ΓIMF= 2.3±0.4. We extend our IMF measurement to lower masses using BV photometry from the OGLE II survey. We use a statistical approach to generate a probability distribution for the mass of each star from the OGLE photometry, and we again find ΓIMF= 2.3±0.6 for stellar masses from 7 M to 20 M. The discovery and removal of ten runaways in our RIOTS4 sample steepens the field IMF slope to ΓIMF= 2.8±0.5. We discuss the possible effects of binarity and star formation history on our results, and conclude that the steep field massive star IMF is most likely a real effect.

Abstract Copyright:

Journal keyword(s): galaxies: stellar content - Magellanic Clouds - stars: early-type - stars: formation - stars: fundamental parameters - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/ApJ/763/101): table1.dat>

Simbad objects: 135

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Number of rows : 135

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 OGLE SMC125.3 34225 EB* 00 42 09.9209301398 -73 13 56.787428561   14.547 14.732   14.958 O8.5V 14 0
2 AzV 2b s*b 00 43 49.8597206562 -73 09 02.782867918 12.333 13.374 13.516   13.67 B0Iw 12 0
3 SK 4 * 00 44 57.0351087870 -73 59 13.397908275 12.78 13.61 13.78   17.20 O9.5Ib-II 12 0
4 2MASS J00451452-7335586 * 00 45 14.5180789808 -73 35 58.433270946   14.89 15.11     O8.5V 4 0
5 SK 10 s*b 00 46 42.1589052355 -73 24 55.493791820 11.903 12.984 13.176   13.35 O6.5I(f) 40 0
6 2MASS J00465615-7318570 * 00 46 56.1279009219 -73 18 57.004699036   14.30 14.46     O7.5V 5 0
7 2MASS J00480056-7334380 * 00 48 00.6030310160 -73 34 37.985215090   14.63 14.81     O7Vz 4 0
8 2MASS J00483085-7215596 * 00 48 30.8335677792 -72 15 59.793742031   14.80 15.01     O8.5V 5 0
9 2MASS J00484432-7259477 * 00 48 44.33 -72 59 47.7   14.12 14.13     O9V 4 0
10 LIN 121 Em* 00 48 45.4077262316 -73 48 16.236057325   14.47 14.6     O9V 6 0
11 AzV 43 * 00 48 47.8983662156 -72 46 24.893378050   13.76 13.88     O9II 15 0
12 OGLE SMC-SC5 26577 * 00 48 48.4610493556 -73 12 29.919997548 13.93 14.81 14.83   15.14 B0.5(IV) 8 0
13 SK 28 s*b 00 49 15.92 -72 52 44.0 11.983 12.984 13.106   13.26 O9.5I 16 0
14 AzV 51 * 00 49 31.9991565740 -72 51 16.852948193 12.98 13.98 14.04   14.26 B0.5(IV) 14 0
15 SK 29 * 00 49 33.1986211106 -73 42 18.516262574 12.69 13.60 13.76   13.96 O8III-V 12 0
16 OGLE J004942.75-731717.7 Em* 00 49 42.7432617660 -73 17 18.166112163   14.338 14.453   14.404 O4-7V((f))e 6 0
17 AzV 57 * 00 49 54.3990471595 -72 24 37.735705243   14.11 14.25     O9III 8 0
18 AzV 58 * 00 49 57.8946135338 -72 51 54.785163234   14.11 14.29     B0.5III 13 0
19 SK 32 * 00 50 01.8664449585 -72 11 26.590816403 12.313 13.414 13.596   13.77 O6III((f)) 34 0
20 AzV 67 Em* 00 50 11.1185380998 -72 32 35.139681707 12.55 13.60 13.73   13.89 O9III 16 0
21 2MASS J00501902-7239179 * 00 50 19.0288150202 -72 39 17.933369124   14.03 14.15     B0.5III 5 0
22 OGLE SMC719.12.035620 El* 00 50 20.47 -72 37 02.9   13.01 13.20   13.416 O9III 6 0
23 2MASS J00502559-7208030 * 00 50 25.5848069774 -72 08 03.229955422 13.95 14.16 14.76   14.86 O9.5Ib 7 0
24 LIN 147 Em* 00 50 26.0518944836 -72 12 10.380772832 12.84 13.83 14.02   14.15 B0-3(II)e 19 0
25 LHA 115-S 11 Em* 00 50 27.189 -73 30 21.71   14.14 14.12 14.10 13.70 B0V 9 0
26 OGLE SMC-SC5 207949 * 00 50 39.9589871532 -72 59 43.464592758 13.51 14.50 14.63   14.76 O8V 7 0
27 LIN 169 Em* 00 50 59.5511039153 -73 32 03.848058322   14.64 14.6     O8III(f) 8 0
28 [M2002] SMC 19382 * 00 51 17.41 -73 23 48.6   14.27 14.31     B0.2V 5 0
29 SK 46 s*b 00 51 23.1464406430 -72 07 20.918091595   12.49 12.59     B1.5Ia 23 0
30 2MASS J00515838-7315489 * 00 51 58.3984621090 -73 15 48.981857315   14.09 14.18     O7.5III((ff)) 5 0
31 OGLE SMC101.4 21947 EB* 00 51 58.96 -72 16 38.5   14.96 15.10   15.425 O7Vz 7 0
32 LIN 195 Em* 00 52 05.9184954677 -73 04 25.363334713   13.969 13.904   13.624 O7.5-8.5Ve 8 0
33 2MASS J00520806-7332477 * 00 52 08.0840950426 -73 32 47.732465632   13.98 14.14     O9III 5 0
34 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9661 1
35 AzV 130 * 00 52 39.7427041630 -73 05 12.676327083 13.38 14.29 14.52   14.76 B0.5III 9 0
36 [MA93] 631 Em* 00 52 58.6433327681 -73 02 18.795991262   15.083 15.119   14.987 B0Ve 5 0
37 OGLE J005342.19-725309.4 HXB 00 53 42.1996497608 -72 53 09.700296483   14.695 14.737   14.46 B0Ve 8 0
38 SV* HV 1620 EB* 00 54 38.2334572149 -72 32 06.415047211 13.36 14.34 14.45 14.62 14.68 B0.5(IV)e? 32 0
39 [M2002] SMC 33823 * 00 55 30.57 -72 27 15.7   14.45 14.62     B0III 5 0
40 [M2002] SMC 34005 * 00 55 33.9140914936 -72 02 43.840898093   14.80 15.01     O9V 5 0
41 AzV 170 s*b 00 55 42.4296940734 -73 17 30.524041493 12.86 13.82 14.11   14.25 O9.7I 25 0
42 [M2002] SMC 35491 * 00 55 59.5869842406 -72 19 54.252670089 13.72 14.78 14.83   14.96 O9IV 9 0
43 2MASS J00560168-7208251 * 00 56 01.6538401110 -72 08 24.711122117   14.88 15.15     O8V 5 0
44 SK 62 s*b 00 56 11.5320679799 -72 54 37.471240542 11.783 12.694 12.68 12.55 12.75 B2Ia 19 0
45 2MASS J00561228-7305511 * 00 56 12.2798660698 -73 05 51.123116820   13.21 13.38     O9.5III+B 6 0
46 [M2002] SMC 36325 * 00 56 14.25 -72 42 56.0   15.02 14.88     O9-9.5V 4 0
47 [SBV2013] B115 * 00 56 17.3228694887 -72 17 28.656595423 14.03 15.10 15.20   15.44 O9V 19 0
48 LIN 310 Em* 00 56 33.6856532274 -72 12 39.977821837   14.65 14.7     B0Ve 7 0
49 AzV 177 * 00 56 44.1039426083 -72 03 31.678690906 13.22 14.39 14.62   14.90 O4Vz 23 0
50 Cl* NGC 330 SW 95 Be* 00 56 44.3421135811 -72 29 06.512776080 13.49 14.68 14.76   14.92 O6.5-7.5IIIe 15 0
51 AzV 182 * 00 57 00.7176690083 -72 08 11.365729792 13.04 14.19 14.29   14.23 B0III 12 0
52 2MASS J00572792-7200263 * 00 57 27.9252143322 -72 00 26.180559944   14.22 14.33     O7V 5 0
53 2MASS J00580550-7226043 * 00 58 05.5755049830 -72 26 04.269867917   14.43 14.54     O9.5V 5 0
54 AzV 207 * 00 58 33.1898142618 -71 55 46.720823750 12.99 14.13 14.35   14.58 O7Vz((f)) 32 0
55 NGC 346 Cl* 00 59 05.090 -72 10 33.24           ~ 451 0
56 2dFS 1382 * 00 59 20.46 -72 14 25.3   14.74 14.85     O9.5V 9 0
57 AzV 226 * 00 59 20.7287691158 -72 17 10.615963093 12.97 14.12 14.19     O7IIIn((f)) 24 0
58 AzV 228 Em* 00 59 22.1642206465 -72 45 13.178340178   14.58 14.49     B0Ve 13 0
59 OGLE SMC-SC8 129167 Em* 00 59 27.4253576922 -72 48 37.219956071 13.54 14.58 14.81   15.09 O8.5V 9 0
60 2MASS J00593861-7144191 * 00 59 38.6049297922 -71 44 19.115096299   15.05 15.15     O8.5V 5 0
61 Cl* NGC 346 ELS 31 * 00 59 54.0609710475 -72 04 31.421162212 13.71 14.81 15.05   15.33 O8Vz 15 0
62 [MA93] 1186 Em* 01 00 07.3511269952 -72 34 26.669703293   14.56 14.6     B0Ve 5 0
63 AzV 244 * 01 00 10.7030934810 -71 48 06.054187296 13.27 14.27 14.47   14.73 O9-9.5V 10 0
64 AzV 249 s?b 01 00 20.3893297701 -72 41 22.675512795 12.88 13.59 13.71     B0I 12 0
65 OGLE SMC-SC9 41745 * 01 00 40.8262340574 -72 13 43.196313122 13.36 14.39 14.64   14.81 B1-3(II) 7 0
66 [MLD95] SMC 16 Be? 01 00 43.9410121774 -72 26 05.151951622 13.16 14.18 14.35   14.49 O9.5III 14 0
67 LIN 374 Em* 01 00 57.1151378800 -72 35 51.725493176   14.48 14.7     O8+B 7 0
68 SK 95 s*b 01 01 09.3916710767 -72 27 28.543895857 11.47 12.48 12.61   12.67 B1I 22 0
69 2MASS J01011473-7154306 * 01 01 14.7317587956 -71 54 30.693561818   15.04 15.19     O8V 5 0
70 AzV 267 * 01 01 15.6927279903 -72 06 35.368445761   14.58 14.84     O7.5-8V 16 0
71 LHA 115-S 32 Em* 01 01 29.5168700413 -72 23 20.040781822 12.58 13.85 13.85   13.69 O8IIIze 14 0
72 OGLE SMC-SC9 81569 * 01 01 31.1725543068 -72 20 08.071658614 13.92 15.06 15.22   15.55 O9V 8 0
73 2MASS J01013285-7216453 * 01 01 32.8426439490 -72 16 45.326936748   14.72 14.97     O5.5V 5 0
74 OGLE SMC-SC9 91851 * 01 01 54.9172028851 -72 07 27.457069590   14.80 14.98     O7II(f) 8 0
75 AzV 285 HXB 01 01 55.8078033164 -72 32 36.404503099 12.72 13.93 14.02   14.01 O6.5-7.5Ve 16 0
76 OGLE SMC-SC9 122249 * 01 02 10.8980547119 -72 25 05.616064552 13.69 14.76 14.90   15.07 O9.5III 7 0
77 [MA93] 1312 Em* 01 02 18.8600107246 -72 17 40.407721538 14.07 15.26 15.22   15.28 O6-9 9 0
78 SK 107 s*b 01 02 51.9500933419 -71 48 24.791443819 11.643 12.744 12.936   13.02 B0Iw 28 0
79 OGLE SMC-SC10 24428 * 01 03 29.73 -72 17 55.7   14.87 14.95     O9III-V 10 0
80 AzV 350 * 01 04 19.8313420583 -72 40 49.374369084 12.93 13.89 14.02   14.19 B1III 9 0
81 [MA93] 1466 Em* 01 04 27.8449253900 -72 04 52.472834328   14.23 14.5     O5-7Ve 9 0
82 SXP 11.5 HXB 01 04 42.28 -72 54 03.7   14.81 14.81     O8.5-9.5IIIe 28 1
83 OGLE SMC-SC10 85867 * 01 04 53.2657150608 -72 40 34.153537669 13.80 14.90 15.11   15.41 O8-9V 8 0
84 NAME SMC Bar PoG 01 05 -72.6           ~ 202 0
85 SK 120 s?b 01 05 24.7609580271 -73 03 52.976115468 12.47 13.43 13.53   13.56 B1-1.5I 21 1
86 [M2002] SMC 62416 * 01 05 39.78 -72 20 27.0   14.59 14.68     O9.5V 5 0
87 LHA 115-S 47 Em* 01 06 06.3114182027 -72 18 03.486035290 15.88 13.90 14.03   13.98 B1-2(II) 18 0
88 AzV 398 s*b 01 06 09.8133816421 -71 56 00.746563020 13.15 13.94 13.98   13.71 O9.7Ia 41 0
89 OGLE SMC-SC11 17560 * 01 06 51.1596399827 -72 33 21.714129503 14.04 15.17 15.35   15.58 B0:(V) 7 0
90 2dFS 2252 * 01 07 06.9843209316 -72 08 46.741167430   14.99 15.19     O8V 8 0
91 OGLE SMC111.3 9765 EB* 01 07 07.2882170237 -73 11 10.037622225 14.04 14.75 14.97   15.24 O7V 9 0
92 SK 132 s*b 01 07 40.3905387452 -72 51 00.063860505 12.08 13.13 13.31 13.30 13.45 O9.5II(n) 40 0
93 AzV 429 EB* 01 07 59.8336580662 -72 00 53.979194048 13.40 14.49 14.69   14.91 O7Vz 15 0
94 2MASS J01080613-7233008 * 01 08 06.1322825888 -72 33 00.976420447   14.56 14.73     O7.5-8V 5 0
95 [MA93] 1656 Em* 01 08 18.0952753042 -72 36 25.011479059   15.123 15.109   14.834 O7.5-8.5Ve 6 0
96 LHA 115-S 54 Em* 01 08 25.8442344801 -72 23 27.316812490 12.72 13.99 13.89   13.82 B0(II)e 18 0
97 LHA 115-S 53 Em* 01 08 44.2487439770 -73 14 50.717532554 12.55 13.55 13.7   13.13 B0.2IIIe 19 0
98 AzV 439 * 01 08 51.0863919642 -71 49 51.680873294 13.47 14.49 14.68   14.87 O9.5III 12 0
99 AzV 440 * 01 08 56.0209999538 -71 52 46.695829015 13.42 14.30 14.58   14.76 O7.5III((f)) 20 0
100 [MA93] 1694 Em* 01 09 21.9492113525 -73 15 41.915443488 13.93 14.87 15.10   15.01 O6.5II(f) 10 0
101 AzV 446 * 01 09 25.4274868978 -73 09 29.907690746 13.37 14.38 14.61   14.91 O6.5Vz 18 0
102 AzV 447 * 01 09 28.3316163628 -72 17 14.782972111   13.79 14.01     B1II 11 0
103 AzV 448 * 01 09 48.2430429834 -72 30 19.327259673 13.37 14.48 14.69   14.96 O8.5Vn 13 0
104 AzV 451 * 01 10 26.0586777376 -72 23 29.007648208 12.65 13.68 13.98   14.24 O9.5V 19 0
105 AzV 461 * 01 11 25.5707151318 -72 09 48.802001604 13.22 14.40 14.61   14.94 O8V+neb 16 0
106 SK 145 s*b 01 11 25.9165264050 -72 31 21.277198421 11.463 12.464 12.596   11.60 B2.5Ia 35 0
107 SK 147 Em* 01 11 43.4910722194 -73 13 53.518226623 12.343 13.474 13.506   14.67 O7.5V 14 0
108 AzV 467 EB* 01 11 53.3738878146 -72 44 14.783893941 13.45 14.42 14.76   14.97 B0V 10 0
109 SK 148 * 01 12 29.0069137975 -72 29 29.052551304 11.913 13.014 13.176   13.32 O8.5II((f)) 40 0
110 [MA93] 1760 Em* 01 12 29.7296919188 -73 17 29.770003994   14.24 14.24 14.67 14.47 B0Ve 6 0
111 SK 151 s*b 01 13 00.4001520261 -73 17 04.124180844 12.66 13.62 13.63   13.41 O9.5I 20 0
112 SK 150 s*b 01 13 01.8746841972 -72 45 48.446726311 11.593 12.564 12.676   11.42 B2Ia 27 0
113 LHA 115-N 84C Em* 01 14 17.17 -73 15 49.4   14.65 14.4     O9V 31 0
114 GSC 09142-00856 * 01 14 22.5735271670 -73 13 23.253452393 13.68 14.61 14.74 14.89 14.82 O8.5V 7 0
115 LIN 508 Em* 01 14 55.0188144240 -72 21 38.102991103 13.26 14.41 14.3   14.25 O4-7Ve 17 0
116 2MASS J01151085-7256102 * 01 15 10.8418229947 -72 56 10.171402099   14.32 14.39     O8-9Ve 5 0
117 LHA 115-S 58 Em* 01 15 14.5810892929 -73 28 45.745003425 13.26 14.17 14.11   13.89 B0(III)e 9 0
118 AzV 484 * 01 15 39.2037738772 -73 23 49.464291463 12.84 13.78 13.89   14.16 O9.5III 13 0
119 2MASS J01165764-7319266 * 01 16 57.6100655587 -73 19 26.683445652 12.84 13.78 14.03   14.19 O6.5V 7 0
120 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 808 0
121 SK 161 s*b 01 17 18.0469038401 -73 12 00.147575630   12.55 12.69     B0.5I 19 0
122 [MA93] 1860 Em* 01 18 53.9681627493 -73 09 38.339269771   14.27 14.4     O9.5III-V 9 0
123 2MASS J01193979-7314499 * 01 19 39.7982079371 -73 14 49.870592690   14.40 14.60     O9V 7 0
124 2MASS J01232110-7349518 * 01 23 21.1011104760 -73 49 51.730841107   14.24 14.46     O8V 7 0
125 2MASS J01232516-7322011 * 01 23 25.1561157915 -73 22 01.055776309   14.24 14.43     B0(IV) 7 0
126 2dFS 3712 * 01 24 51.2050834087 -73 27 01.819466844   14.15 14.36     O9III 8 0
127 [M2002] SMC 81941 * 01 25 35.7260377413 -73 11 10.883694483   13.82 14.03     O9.5V 5 0
128 2dFS 3780 * 01 26 35.2858368772 -73 15 16.282189421   14.12 14.37     O9.5III 7 0
129 [M2002] SMC 82489 * 01 27 04.3090345562 -73 04 38.819580240   14.17 14.22     O6.5-7.5Ve 5 0
130 2dFS 3899 * 01 29 12.5842498133 -73 17 26.658189708   14.28 14.39     B1-3(II)e 6 0
131 SK 187 * 01 30 50.2522323899 -73 22 58.905852620   12.99 13.18     O8.5III 14 0
132 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5829 1
133 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15129 1
134 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 182 0
135 NGC 4228 SBG 12 15 39.174 +36 19 36.80 10.63 10.30 9.93 9.74   ~ 875 1

    Equat.    Gal    SGal    Ecl

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2021.01.28-11:12:04

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