2017A&A...603A..75L


Query : 2017A&A...603A..75L

2017A&A...603A..75L - Astronomy and Astrophysics, volume 603A, 75-75 (2017/7-1)

Gaia TGAS search for Large Magellanic Cloud runaway supergiant stars. Candidate hypervelocity star discovery and the nature of R 71.

LENNON D.J., VAN DER MAREL R.P., RAMOS LERATE M., O'MULLANE W. and SAHLMANN J.

Abstract (from CDS):

Aims. Our research aims to search for runaway stars in the Large Magellanic Cloud (LMC) among the bright HIPPARCOS supergiant stars included in the Gaia DR1 Tycho-Gaia astrometric solution (TGAS) catalogue.
Methods. We compute the space velocities of the visually brightest stars in the Large Magellanic Cloud that are included in the TGAS proper motion catalogue. This sample of 31 stars contains a luminous blue variable (LBV), emission line stars, blue and yellow supergiants, and an SgB[e] star. We combine these results with published radial velocities to derive their space velocities, and by comparing with predictions from stellar dynamical models we obtain each star's (peculiar) velocity relative to its local stellar environment.
Results. Two of the 31 stars have unusually high proper motions. Of the remaining 29 stars we find that most objects in this sample have velocities that are inconsistent with a runaway nature, being in very good agreement with model predictions of a circularly rotating disk model. Indeed the excellent fit to the model implies that the TGAS uncertainty estimates are likely overestimated. The fastest outliers in this subsample contain the LBV R 71 and a few other well known emission line objects though in no case do we derive velocities consistent with fast (∼100km/s) runaways. On the contrary our results imply that R 71 in particular has a moderate deviation from the local stellar velocity field (40km/s) lending support to the proposition that this object cannot have evolved as a normal single star since it lies too far from massive star forming complexes to have arrived at its current position during its lifetime. Our findings therefore strengthen the case for this LBV being the result of binary evolution. Of the two stars with unusually high proper motions we find that one, the isolated B1.5 Ia+ supergiant Sk-67 2 (HIP 22237), is a candidate hypervelocity star, the TGAS proper motion implying a very large peculiar transverse velocity (∼360km/s) directed radially away from the LMC centre. If confirmed, for example by Gaia Data Release 2, it would imply that this massive supergiant, on the periphery of the LMC, is leaving the galaxy where it will explode as a supernova.

Abstract Copyright: © ESO, 2017

Journal keyword(s): Magellanic Clouds - stars: massive - supergiants - stars: kinematics and dynamics - proper motions - proper motions

Simbad objects: 44

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Number of rows : 44
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 HD 269 * 00 07 20.2809425443 -32 03 08.544239756   9.66 8.61     K1/2III 7 0
2 HD 2690 * 00 30 31.2409729373 +03 16 00.774244596   9.57 8.44 10.6   K0III 14 0
3 HD 2688 * 00 30 39.8806443965 +32 08 11.329138271   7.95 7.53     F2 24 0
4 HD 2687 * 00 30 50.2021770844 +46 35 10.027665388   9.78 8.75     K0 3 0
5 HD 2709 * 00 31 29.1369014362 +71 21 35.786838743   9.44 9.37     A 5 0
6 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9854 1
7 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5994 1
8 HE 0437-5439 HS* 04 38 12.7828185490 -54 33 11.840105637 15.37 16.18 16.42     sdB+F 67 0
9 HD 270754 s*b 04 47 04.4509246872 -67 06 53.119185546 10.351 11.219 11.26   10.992 B1.5Ia 65 0
10 HD 268654 s*b 04 49 12.3985207696 -69 27 23.512368999 10.10 10.63 10.46 10.28 10.14 B9Ia 39 0
11 HD 268729 s*b 04 53 43.2834319031 -68 42 53.290883859 10.195 11.05 10.93   10.970 B5Ia+ 30 0
12 HD 268757 s*y 04 54 14.2560317739 -69 12 36.443730943 15.702 11.662 10.157 9.21 8.52 G8_0 73 0
13 HD 268675 s*b 04 54 57.3540462578 -66 45 08.815870206 10.226 10.85 10.770   10.564 B8Ia 26 0
14 HD 268719 sg* 04 55 21.6048576409 -67 26 11.255290098   11.2 11.3     A1Iak 23 0
15 HD 268819 s*y 04 55 32.4589742393 -69 57 45.085592123 10.97 10.58 10.08 9.72 9.541 F5Ia 45 0
16 HD 268835 s*b 04 56 47.0796207119 -69 50 24.767090336 10.21 10.77 10.63 10.72 10.16 B8[e] 101 0
17 HD 270920 * 04 59 09.0607867683 -65 40 03.724479386   10.80 9.91     G5I: 33 0
18 HD 269006 s*b 05 02 07.3944119328 -71 20 13.118657760 9.93 10.60 10.55 10.43 10.38 LBV 235 0
19 HD 269018 * 05 03 29.5850064565 -70 41 59.409128421 10.979 11.65 11.704   11.501 OB 23 0
20 HD 268946 sg* 05 05 12.2206129904 -66 44 12.571049118 9.86 10.41 10.42 10.28 10.17 A0Ia 39 0
21 HD 33579 sg* 05 05 55.5119227765 -67 53 10.930943931   9.32 9.13     A2Ia+ 127 0
22 HD 271018 * 05 07 14.1801584343 -66 03 18.431792075 12.42 12.01 11.43 10.88 11.017 ~ 41 0
23 HD 269172 sg* 05 09 38.9161222734 -71 24 02.237307563 9.929 10.648 10.56   11.864 A0Ia0 31 0
24 HD 269128 s*b 05 10 22.7894940469 -68 46 23.818379498 9.77 10.52 10.412 10.29 10.268 B2.5Ieq 96 0
25 HD 269216 Em* 05 13 30.7809925326 -69 32 23.648218945 10.227 10.84 11.123 10.96 10.573 OBe 40 0
26 HD 269327 Em* 05 17 46.3769755418 -69 50 57.232534745   10.71 10.74 10.92   OB 23 0
27 HD 271182 s*y 05 21 01.7107934366 -65 48 02.419934092   10.36 9.620     F8_0 91 0
28 HD 269408 * 05 22 21.0725281320 -66 15 37.004096018   11.64 11.59     B6I 22 0
29 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15461 1
30 HD 269541 sg* 05 26 34.8846268166 -68 52 07.336979462   10.53 10.43     A2Ia 36 0
31 HD 269551 Em* 05 26 53.118 -68 50 00.26   10.91 11.5 10.67   OBe 30 0
32 HD 269594 * 05 28 20.3347142116 -67 24 18.314094562   11.28 10.69 10.32 9.95 G5I 40 0
33 HD 269660 s*b 05 30 47.7721628933 -71 04 02.327074797 10.281 11.15 11.19   10.767 B2Ia 51 0
34 LHA 120-N 206A HII 05 31 15.2 -71 03 58           ~ 99 2
35 HD 269697 s*y 05 31 38.4228564397 -67 28 11.561399999 10.99 10.69 10.28     F6Ia 50 0
36 HD 269781 sg* 05 34 22.4677357043 -67 01 23.570325836 9.34 9.94 9.87 9.74 9.67 A0Iae 48 0
37 HD 37836 Em* 05 35 16.6331678655 -69 40 38.439677992 9.87 10.736 10.599 10.73 10.164 B0e(q) 74 0
38 HD 269857 sg* 05 36 32.3798582955 -68 54 01.671134386   10.64 10.29     A9Ia 39 0
39 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1806 1
40 UCAC4 105-014417 WR* 05 38 55.5218836143 -69 04 26.810760074   16.66 16.08   14.89 WN5h 53 0
41 HD 269982 sg* 05 40 57.8104968353 -69 15 31.141503383   11.15 10.79     A3Ia 33 0
42 HD 270086 sg* 05 45 16.6171131853 -68 59 51.971631320   10.45 10.19 10.22 10.08 A1Ia0 54 0
43 HD 270296 * 05 53 10.0269815703 -68 07 06.956496335   11.6 11.5     B6I 22 0
44 HD 270305 * 05 53 49.7078185347 -68 18 47.352391525 11.037 11.666 11.610   11.697 B6I 23 0

    Equat.    Gal    SGal    Ecl

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2021.07.24-17:08:01

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