2001A&A...378..986V


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST23:26:45

2001A&A...378..986V - Astronomy and Astrophysics, volume 378, 986-995 (2001/11-2)

Optical spectroscopy and photometry of the neutron star RX J1856.5-3754.

VAN KERKWIJK M.H. and KULKARNI S.R.

Abstract (from CDS):

We present spectroscopy and imaging with the Very Large Telescope (VLT) of the neutron star RX J1856.5-3754. Little is known about the nature of this source other than that it is a nearby hot neutron star. Our VLT spectrum does not show any strong emission or absorption features. With considerable care to photometric calibration, we obtain photometric measurements over the optical and ultra-violet (UV) using our VLT observations and a detailed analysis of archival Hubble Space Telescope data. We find that the entire optical to UV spectral energy distribution is well described by a slightly reddened Rayleigh-Jeans tail (fλ=(2.96±0.06)x10–19(λ/5000Å)–4*10–0.4(0.12±0.05)(Aλ/AV_-1.138)erg/s/cm2^/Å, where Aλ/AV is the reddening curve; implied V=25.58±0.02). The reddening is consistent with the interstellar absorption inferred from X-ray spectroscopy. The simplest explanation for this Rayleigh-Jeans emission is that the optical-UV radiation arises from thermal emission from the surface of the neutron star. The high degree to which the data conform to the Rayleigh-Jeans tail significantly limits contributions from other sources of emission. In particular, our observations are inconsistent with the presence of an accretion disk and also strongly constrain the amount of magnetospheric emission from this enigmatic neutron star.

Abstract Copyright:

Journal keyword(s): stars: individual: RX J1856.5-3754 - stars: neutron - X-rays: stars

Nomenclature: Fig.1, Table 5: [VK2001] g N=1, [VK2001] X N=1.

Simbad objects: 26

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Number of rows : 26

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 WG 2 WD* 00 50 03.6494717240 -52 08 15.515729263 13.354 14.157 14.206 14.31 14.428 DA2.7 75 0
2 V* CM Tau Psr 05 34 31.93830 +22 00 52.1758           ~ 4808 1
3 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1092 0
4 PSR B0656+14 Psr 06 59 48.183 +14 14 21.54   24.85 24.90     ~ 759 1
5 RX J0720.4-3125 N* 07 20 24.961 -31 25 50.21   26.1   27.0   ~ 281 0
6 CMS 30 * 08 56 34.899 -37 54 24.11   19.61 18.92     ~ 10 0
7 PG 0942-029 HS* 09 45 11.8536195586 -03 09 21.033075924 12.537 13.714 14.012 14.144 14.308 sdB 41 0
8 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1120 1
9 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 439 1
10 PG 1657+078 HS* 16 59 32.2152633688 +07 43 31.413989790 13.919 14.877 15.019 15.098 15.115 sdB 49 0
11 [W2001] 116 ? 18 56 33.6869 -37 54 36.232   25.35       ~ 3 0
12 WWN F * 18 56 34.5385672175 -37 54 35.076158425   17.5 17.45 16.9 16.17 G9/K0III/V 8 0
13 [W2001] 102 ? 18 56 34.5906 -37 54 22.338   25.77       ~ 3 0
14 RX J1856.6-3754 N* 18 56 35.11 -37 54 30.5     25.7     ~ 388 0
15 CMS 23 * 18 56 35.1855 -37 54 36.142     24.41     ~ 9 0
16 CMS 15 * 18 56 35.221 -37 54 46.66   19.39 18.72     ~ 10 0
17 CMS 27 * 18 56 35.408 -37 54 27.76   22.03 21.18     ~ 11 0
18 WWN C * 18 56 35.455 -37 54 49.84   17.2 18.21 16.6 16.89 G6/8III/V 10 0
19 [W2001] 106 ? 18 56 35.5512 -37 54 25.310   23.13       ~ 5 0
20 WWN L * 18 56 35.745 -37 54 25.03   18.18 17.75 15.9 16.51 G3/6III/V 9 0
21 [W2001] 114 ? 18 56 35.9229 -37 54 31.175   24.66       ~ 5 0
22 CMS 28 * ~ ~   23.05 22.05     ~ 8 0
23 CMS 26 * ~ ~   23.07 21.84     ~ 7 0
24 CMS 24 * ~ ~   22.67 20.85     ~ 7 0
25 CMS 21 * ~ ~   23.50 21.54     ~ 8 0
26 CMS 19 * ~ ~   23.59 22.40     ~ 6 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-23:26:45

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