2002A&A...395..129K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.25CET09:36:48

2002A&A...395..129K - Astronomy and Astrophysics, volume 395, 129-140 (2002/11-3)

Confirmation of two cyclotron lines in Vela X-1.

KREYKENBOHM I., COBURN W., WILMS J., KRETSCHMAR P., STAUBERT R., HEINDL W.A. and ROTHSCHILD R.E.

Abstract (from CDS):

We present pulse phase-resolved X-ray spectra of the high mass X-ray binary Vela X-1 using the Rossi X-ray Timing Explorer. We observed Vela X-1 in 1998 and 2000 with a total observation time of ∼90ksec. We find an absorption feature at 23.3+1.3–0.6keV in the main pulse, that we interpret as the fundamental cyclotron resonant scattering feature (CRSF). The feature is deepest in the rise of the main pulse where it has a width of 7.6+4.4–2.2keV and an optical depth of 0.33+0.06–0.13 . This CRSF is also clearly detected in the secondary pulse, but it is far less significant or undetected during the pulse minima. We conclude that the well known CRSF at 50.9+0.6–0.7keV, which is clearly visible even in phase-averaged spectra, is the first harmonic and not the fundamental. Thus we infer a magnetic field strength of B=2.6x1012G.

Abstract Copyright:

Journal keyword(s): X-rays: stars - stars: magnetic fields - stars: pulsars: individual: Vela X-1

VizieR on-line data: <Available at CDS (J/A+A/395/129): table3a to table3o>

CDS comments: 4U 1907+07 is a misprint for 4U 1907+09.

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V635 Cas HXB 01 18 31.9704429246 +63 44 33.071137750 17.05 16.64 15.19 14.34 13.22 B0.2Ve 669 0
2 V* X Per HXB 03 55 23.0778791365 +31 02 45.045745259 6.090 6.840 6.720     O9.5III 909 0
3 HD 245770 HXB 05 38 54.5749436467 +26 18 56.839215267 9.30 9.84 9.39 8.77 8.30 O9/B0III/Ve 879 0
4 V* GP Vel HXB 09 02 06.8610736194 -40 33 16.896402010 6.85 7.37 6.87 6.31 6.05 B0.5Ia 1377 0
5 V* V779 Cen HXB 11 21 15.0920367078 -60 37 25.627505233   14.4       O9III/Veq 996 0
6 V* BP Cru HXB 12 26 37.5607088371 -62 46 13.259605389   12.70 10.66     B1.5Iaeq 610 0
7 V* QV Nor HXB 15 42 23.3633078550 -52 23 09.576918639   16.3 14.5     B0.2Ia:e 374 1
8 V* KZ TrA LXB 16 32 16.79 -67 27 39.3 17.40 18.60 18.5     ~ 526 1
9 V* HZ Her LXB 16 57 49.8110797681 +35 20 32.487435684 11.90 14.89 13.63 13.88   B3/6ep 1929 0
10 4U 1907+09 HXB 19 09 37.9 +09 49 49   19.41 16.35 14.40 12.53 O8.5Iab 309 1
11 XTE J1946+274 HXB 19 45 39.3569004855 +27 21 55.502556930   18.76 16.92 15.62 14.38 B0-1IV-Ve 104 0

    Equat.    Gal    SGal    Ecl

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2020.10.25-09:36:48

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