2007A&A...473..523V


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.15CEST08:59:02

2007A&A...473..523V - Astronomy and Astrophysics, volume 473, 523-538 (2007/10-2)

Determination of the mass of the neutron star in SMC X-1, LMC X-4, and Cen X-3 with VLT/UVES.

VAN DER MEER A., KAPER L., VAN KERKWIJK M.H., HEEMSKERK M.H.M. and VAN DEN HEUVEL E.P.J.

Abstract (from CDS):

We present the results of a spectroscopic monitoring campaign of the OB-star companions to the eclipsing X-ray pulsars SMC X-1, LMC X-4 and Cen X-3. High-resolution optical spectra obtained with UVES on the ESO Very Large Telescope are used to determine the radial-velocity orbit of the OB (super)giants with high precision. The excellent quality of the spectra provides the opportunity to measure the radial-velocity curve based on individual lines, and to study the effect of possible distortions of the line profiles due to e.g. X-ray heating on the derived radial-velocity amplitude. Several spectral lines show intrinsic variations with orbital phase. The magnitude of these variations depends on line strength, and thus provides a criterion to select lines that do not suffer from distortions. The undistorted lines show a larger radial-velocity amplitude than the distorted lines, consistent with model predictions. Application of our line-selection criteria results in a mean radial-velocity amplitude Kopt of 20.2±1.1, 35.1±1.5, and 27.5±2.3km/s (1σ errors), for the OB companion to SMC X-1, LMC X-4 and Cen X-3, respectively. Adding information on the projected rotational velocity of the OB companion (derived from our spectra), the duration of X-ray eclipse and orbital parameters of the X-ray pulsar (obtained from literature), we arrive at a neutron star mass of 1.06+0.11–0.10, 1.25+0.11–0.10 and 1.34+0.16–0.14M for SMC X-1, LMC X-4 and Cen X-3, respectively. The mass of SMC X-1 is near the minimum mass (∼1M) expected for a neutron star produced in a supernova. We discuss the implications of the measured mass distribution on the neutron-star formation mechanism, in relation to the evolutionary history of the massive binaries.

Abstract Copyright:

Journal keyword(s): stars: binaries: eclipsing - stars: neutron - stars: general - equation of state - accretion, accretion disks

VizieR on-line data: <Available at CDS (J/A+A/473/523): smcx1/* lmcx4/* cenx3/*>

Simbad objects: 33

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Number of rows : 33

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 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9831 1
2 SK 160 HXB 01 17 05.1447530244 -73 26 36.015353425 12.23 13.00 13.15   13.17 O9.7Ia+ 814 0
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 5975 1
4 PSR J0437-47 Psr 04 37 15.99744 -47 15 09.7170           DC 791 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15421 1
6 X LMC X-4 HXB 05 32 49.5558669817 -66 22 13.202534152   13.9 14.0     O8III 618 0
7 PSR J0621+10 Psr 06 21 22.11108 +10 02 38.7410           ~ 97 1
8 PSR J0737-3039A Psr 07 37 51.24720 -30 39 40.6700           ~ 238 1
9 PSR J0737-3039 Psr 07 37 51.248 -30 39 40.83           ~ 380 1
10 PSR J0737-3039B Psr 07 37 51.24927 -30 39 40.7195           ~ 185 1
11 PSR J0751+1807 Psr 07 51 09.1539 +18 07 38.335           ~ 261 1
12 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1396 0
13 PSR J1012+5307 Psr 10 12 33.4341531837 +53 07 02.564526788     19.5     DA 330 1
14 PSR J1045-45 Psr 10 45 50.18941 -45 09 54.1430           ~ 118 1
15 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4 12.27     O9III/Veq 1011 0
16 PSR J1141-6545 Psr 11 41 06.97000 -65 45 19.1600     25.08 24.38   ~ 158 1
17 PSR J1518+4904 Psr 15 18 16.832 +49 04 34.19           ~ 163 1
18 PSR B1534+11 Psr 15 37 09.9603 +11 55 55.554           ~ 403 1
19 V* QV Nor HXB 15 42 23.3633078550 -52 23 09.576918639   16.3 14.5     B0.2Ia:e 383 1
20 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1957 0
21 HD 153919 HXB 17 03 56.7728262865 -37 50 38.912077679 6.06 6.78 6.51 6.08 5.90 O6Iafcp 775 1
22 PSR J1713+0447 Psr 17 13 49.53053 +07 47 37.5264           ~ 376 1
23 PSR J1804-27 Psr 18 04 21.1312 -27 17 31.200           ~ 64 1
24 PSR J1802-07 Psr 18 04 49.8954 -07 35 24.690     12.33     ~ 91 2
25 V* V691 CrA LXB 18 25 46.8186056396 -37 06 18.529015318 14.30 15.20 15.1     ~ 408 0
26 PSR B1855+09 Psr 18 57 36.39161 +09 43 17.2322           DA 488 1
27 PSR J1909-3744 Psr 19 09 47.42820 -37 44 14.7740           ~ 216 2
28 PSR J1915+1606 Psr 19 15 27.99999 +16 06 27.4034     22.5     ~ 938 1
29 PSR J2019+24 Psr 20 19 31.94900 +24 25 15.3038           ~ 125 1
30 V* LZ Aqr LXB 21 23 14.54 -05 47 52.9 15.90 16.78 16.8     ~ 144 0
31 PSR J2129+1209C Psr 21 30 01.2030 +12 10 38.159           ~ 175 2
32 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1095 1
33 PSR J2305+4707 Psr 23 05 55.842 +47 07 45.32           ~ 211 1

    Equat.    Gal    SGal    Ecl

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2021.06.15-08:59:02

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