2018ApJ...869L..31D

Query : 2018ApJ...869L..31D

2018ApJ...869L..31D - Astrophys. J., 869, L31-L31 (2018/December-3)

The origin of high-velocity stars from Gaia and LAMOST.

DU C., LI H., NEWBERG H.J., CHEN Y., SHI J., WU Z. and MA J.

Abstract (from CDS):

Based on the second Gaia data release and spectroscopy from the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Data Release 5, we define the high-velocity (HiVel) stars sample as those stars with vgc > 0.85vesc, and derived the final sample of 24 HiVel stars with stellar astrometric parameters and radial velocities. Most of the HiVel stars are metal poor and α-enhanced. In order to further explore the origin of these HiVel stars, we traced the backward orbits of each HiVel star in the Galactic potential to derive probability parameters that are used to classify these HiVel stars. Of these, 5 stars are from the tidal debris of disrupted dwarf galaxy, and 19 stars are runaway-star candidates originating from the stellar disk.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: abundances - Galaxy: center - Galaxy: kinematics and dynamics

Simbad objects: 25

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Number of rows : 25
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 TYC 2319-713-1 Pe* 01 56 52.6465005336 +36 39 57.895345908   12.83 11.71     G2 6 0
2 LSPM J0239+0306 PM* 02 39 29.4640519992 +03 06 20.110913424   13.1   12.4   ~ 5 0
3 Gaia DR3 1002667884848937600 HV* 07 07 09.9063174318 +59 34 30.796851932           ~ 2 0
4 UCAC4 506-048334 HV* 08 47 14.4136050021 +11 01 53.826575036   13.061 12.578 12.400   ~ 3 0
5 UCAC4 421-055162 HV* 11 17 25.4875147968 -05 48 55.111766112   13.451 12.532 12.434   G3 6 0
6 Gaia DR3 3905884598043829504 HV* 12 05 00.9750595728 +09 27 21.338308152           G0 6 0
7 [M60b]+31 114 HV* 12 21 53.9387665920 +31 04 46.153324200   11.87 11.34     F5 6 0
8 Gaia DR3 3736372993468775424 Pe* 13 11 51.3469951824 +11 17 22.273325844           G6 5 0
9 UCAC4 691-052684 HV* 13 38 40.6622892312 +48 09 23.391107640   13.314 12.815 12.764   G0 4 0
10 Ross 50 Pe* 14 34 51.1109112182 +25 10 03.231384132   13.38   12.1   ~ 53 0
11 UCAC4 582-050258 HV* 15 03 08.0939416824 +26 14 47.043946140   14.04 13.17 13.04   G3 10 0
12 TYC 3869-36-1 HV* 15 34 28.9929845928 +54 18 21.100815180   11.7 11.1     G0 3 0
13 UCAC4 547-055520 SB* 15 48 26.5186456296 +19 17 19.903121412   13.660 12.649 12.452   ~ 5 0
14 UCAC4 656-058031 HV* 16 01 20.9988781536 +41 10 00.536406384     13.265 13.127   G7 10 0
15 Gaia DR3 4450458649852400640 HV* 16 10 47.3939263272 +07 09 36.355873752           ~ 2 0
16 Gaia DR3 4443717204762199552 HV* 17 04 52.0116531816 +09 21 19.368946008           ~ 1 0
17 Gaia DR3 4443836776652403072 HV* 17 11 27.6050344272 +10 12 46.831425732           ~ 2 0
18 Gaia DR3 1341901032000157056 HV* 17 12 32.3038124784 +40 28 24.606494724           G3 3 0
19 Gaia DR3 4491237203962217088 SB* 17 19 32.2410959880 +08 40 23.764151892           ~ 3 0
20 UCAC4 552-060061 HV* 17 33 33.4510888704 +20 19 36.470868204   13.726 12.681 12.399   ~ 4 0
21 TYC 427-404-1 HV* 17 41 09.5837918328 +06 14 22.835133888   13.16 11.51     ~ 1 0
22 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
23 Gaia DR3 4586965565362654464 HV* 18 35 43.4440171464 +27 57 49.790476260           ~ 2 0
24 2MASS J19015625+4558178 RG* 19 01 56.2545766464 +45 58 17.760882072           G8IV 22 0
25 UCAC4 438-122419 HV* 22 23 19.8584673456 -02 31 10.611976584   12.415 11.614 11.453   G3 8 0

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