2007A&A...473..891M


Query : 2007A&A...473..891M

2007A&A...473..891M - Astronomy and Astrophysics, volume 473, 891-896 (2007/10-3)

The optical spectrum of the Vela pulsar.

MIGNANI R.P., ZHARIKOV S. and CARAVEO P.A.

Abstract (from CDS):

Our knowledge of the optical spectra of Isolated Neutron Stars (INSs) is limited by their intrinsic faintness. Among the fourteen optically identified INSs, medium resolution spectra have been obtained only for a handful of objects. No spectrum has been published yet for the Vela pulsar (PSR B0833-45), the third brightest (V=23.6) INS with an optical counterpart. Optical multi-band photometry underlines a flat continuum. In this work we present the first optical spectroscopy observations of the Vela pulsar, performed in the 4000-11000Å spectral range.Our observations have been performed at the ESO Very Large Telescope (VLT) using the FORS2 instrument. The spectrum of the Vela pulsar is characterized by a flat power-law Fν∝ν–α with α=-0.04±0.04 (4000-8000Å), which compares well with the values obtained from broad-band photometry. This confirms, once more, that the optical emission of Vela is entirely of magnetospheric origin. The comparison between the optical spectral indeces of rotation-powered INSs does not show evidence for a spectral evolution, suggesting that, as in the X-rays, the INS aging does not affect the spectral properties of the magnetospheric emission. At the same time, the optical spectral indeces are found to be nearly always flatter then the X-rays ones, clearly suggesting a general spectral turnover at lower energies.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - stars: pulsars: individual: PSR B0833-45

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5027 0
2 M 1 SNR 05 34 32 +22 00.8           ~ 5903 1
3 PSR B0540-69 Psr 05 40 10.84 -69 19 54.2           ~ 837 3
4 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1133 0
5 PSR B0656+14 Psr 06 59 48.1960 +14 14 19.400   24.85 24.90     ~ 804 1
6 NAME Vela XYZ Rad 08 34.0 -45 50           ~ 1167 2
7 NAME Vela Pulsar Psr 08 35 20.65525 -45 10 35.1545     15.10     ~ 2185 1
8 CD-32 5613 WD* 08 41 32.4290850497 -32 56 32.915823461   12.07 11.85 12.3   DA5.5 288 0
9 PSR B0950+08 Psr 09 53 09.2970 +07 55 36.400           ~ 720 2
10 HD 105183 HS* 12 06 47.2348389600 +11 40 12.659833056   10.93 11.06     sdB8IIIHe2 111 0
11 Feige 57 * 12 08 47.8529756112 +07 24 45.041017752   13.27 13.30     A0 6 0
12 PSR B1509-58 Psr 15 13 55.52 -59 08 08.8     13.06     ~ 815 1
13 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 410 0
14 PSR B1929+10 Psr 19 32 14.0570 +10 59 33.380           ~ 720 0

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2022.05.21-15:50:39

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