J/ApJ/952/64 Massive hypervelocity runaway stars in the LMC (Lin+, 2023)
Massive hypervelocity runaway stars in the Large Magellanic Cloud.
Lin Z., Xu Ye, Hao C., Li Y., Liu D., Bian S.
<Astrophys. J., 952, 64 (2023)>
=2023ApJ...952...64L 2023ApJ...952...64L
ADC_Keywords: Magellanic Clouds; Stars, OB; Supernova remnants; Proper motions;
Optical; Surveys
Keywords: Stellar kinematics ; Stellar dynamics ; Proper motions ;
Large Magellanic Cloud
Abstract:
Since the hypervelocity stars were discovered in the Milky Way,
various mechanisms have been proposed to explain these runaway stars.
Up to now, however, the dominant ejected mechanism of hypervelocity
stars is still unclear. As the largest and closest face-on satellite
galaxy of the Milky Way, the Large Magellanic Cloud (LMC) serves as a
good target, allowing us to study this issue. Based on the
high-precision astrometric parameters provided by Gaia Data Release 3,
we researched the proper motions of 3119 massive O-B2-type stars in
the LMC and identified 98 (∼3%) as having the ability to escape from
the LMC, with more than 50% confidence. Furthermore, by investigating
the characteristics of the identified massive stars and adopting a
regression analysis, we find that the dynamic ejection scenario might
be the dominant mechanism of the massive hypervelocity runaway stars
in the LMC.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 143 3119 Massive OB stars in the Large Magellanic Cloud in
this study
table2.dat 108 93 Supernova remnants in the Large Magellanic Cloud in
this study
table3.dat 84 98 Hypervelocity star candidates in the Large
Magellanic Cloud in this study
table4.dat 18 98 Regression analysis for hypervelocity stars in the
Large Magellanic Cloud in this study
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See also:
B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009- )
III/18 : Stellar Spectra Classified in Morgan-Keenan System (Jaschek+ 1964)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
I/350 : Gaia EDR3 (Gaia Collaboration, 2020)
I/357 : Gaia DR3 Part 3. Non-single stars (Gaia Collaboration, 2022)
J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)
J/MNRAS/389/678 : Cat. of extended objects in Magellanic Clouds (Bica+, 2008)
J/ApJ/746/15 : Runaway massive stars from R136 (Banerjee+, 2012)
J/A+A/558/A134 : 30 Dor luminous stars from VLT-FLAMES (Doran+, 2013)
J/A+A/616/A12 : Gaia DR2 sources in GC and dSph (Gaia Collaboration+, 2018)
J/A+A/624/A66 : Massive runaway and walkaway stars models (Renzo+, 2019)
J/A+A/649/A7 : MC structure and properties (Gaia Collaboration+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I04 --- SeqOB [1/3119] Index of massive OB stars in LMC
8- 36 A29 --- Name Massive OB star name as published or valid
SIMBAD name
38- 56 I19 --- GaiaDR3 Gaia DR3 source identifier
60- 86 A27 --- SpType Spectral type (MK, HD, or other) from the
published literature
89- 95 F7.3 mas/yr pmRA [-5.3/7.3] Gaia DR3 Proper motion in RA*
direction
98- 103 F6.3 mas/yr e_pmRA [0.01/0.9] Standard error of proper motion in
R.A.* direction
107- 113 F7.3 mas/yr pmDE [-11.6/11.1] Gaia DR3 Proper motion in DEC
direction
116- 121 F6.3 mas/yr e_pmDE [0.01/0.8] Standard error of proper motion in
DEC direction
125- 143 A19 --- Ref Reference of source name and spectral type,
ADS bibcode
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I02 --- SeqSNR [1/93] Index of SNR in LMC
6- 21 A16 --- Name Name of SNR
27- 33 F7.4 deg RAdeg [71/87.7] SNR right ascension (J2000)
38- 45 F8.4 deg DEdeg [-72.1/-64] SNR declination (J2000)
50- 53 I4 arcsec Diam [1/600] Diameter taken as the geometric
average of the major axis
58- 62 F5.2 mas/yr pmRA [-0.8/0.6] Proper motion in RA* direction
67- 71 F5.2 mas/yr pmDE [-0.6/0.8] Proper motion in DEC direction
75 A1 --- r_Diam Reference for Diam (1)
79- 85 E7.1 yr Age [310/120000]? Age of SNR
90-108 A19 --- r_Age Reference for age, ADS bibcode
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Note (1): References as follows:
1 = Bozzetto et al. 2017ApJS..230....2B 2017ApJS..230....2B
2 = Yew et al. 2021MNRAS.500.2336Y 2021MNRAS.500.2336Y
3 = Kavanagh et al. 2022MNRAS.515.4099K 2022MNRAS.515.4099K
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 2 I02 --- Seq [1/98] Index of hypervelocity runaway star in LMC
6- 9 I04 --- SeqOB [3/3119] Index of massive OB stars in LMC
13- 17 F5.2 deg Xpos [-3.85/2.21] X* direction in face-on LMC's
centric frame
21- 25 F5.2 deg Ypos [-2.5/5.55] Y* direction in face-on LMC's
centric frame
28- 32 F5.2 deg Dist [0.17/5.78] Distance to the LMC center in
face-on LMC's centricframe
35- 40 F6.2 mas/yr pmX [-9.08/6.55] Proper motion in x* direction
44- 47 F4.2 mas/yr e_pmX [0.02/0.76] Standard error on pmX
51- 56 F6.2 mas/yr pmY [-11.98/7.81] Proper motion in y* direction
60- 63 F4.2 mas/yr e_pmY [0.03/0.89] Standard error on on pmY
67- 71 F5.2 mas/yr pmtot [1.09/13.7] Total proper motion
75- 78 F4.2 mas/yr e_pmtot [0.02/0.88] Standard error of total proper motion
82- 84 I3 --- conf [58/100] Confidence of hypervelocity runaway star
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 2 I02 --- Seq [1/98] Index of hypervelocity runaway star in LMC
6- 8 I3 --- Nmax [0/209] Maximum number of massive OB stars
encountered (1)
12- 18 E7.1 yr tmax [0/4400000] Corresponding time scale of Nmax
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Note (1): Maximum number of massive OB stars will be encountered
during the regression process of the hypervelocity star at the
typical stellar association scale.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 16-Sep-2025