Query : 1999A&A...342L...5G

1999A&A...342L...5G - Astronomy and Astrophysics, volume 342, L5-8 (1999/2-1)

Radius and distance estimates of the isolated neutron stars Geminga and PSR B0656+14 using optical photometry.


Abstract (from CDS):

Integrated ground-based and HST optical studies of isolated neutron stars have provided important independent datasets in the determination of emission activity, particularly in the fitting of anticipated Rayleigh-Jeans extrapolations from EUV/soft X-ray datasets, despite their intrinsic faintness. Differentiation of the pulsed and unpulsed fluxes and consequently of the nonthermal and thermal modes of emission could provide definitive data with which to constrain this blackbody continuum. Based upon high speed photometric observations of Geminga and PSR B0656+14 in the B band, we have combined upper limits of unpulsed emission with recently published model-fits with a view to assessing possible implications for the R/d parameter. For Geminga, with a known distance of ∼160pc, we find that R≤9.5km for a ∼ blackbody source, and R≤10.0km with the presence of a magnetized H atmosphere. In addition, we suggest that PSR B0656+14 is some ∼4-5 times closer than the 760pc estimated from DM measurements alone.

Abstract Copyright:

Journal keyword(s): stars: pulsars: individual: Geminga, PSR B0656+14

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NAME Geminga Psr 06 33 54.153 +17 46 12.91           ~ 1133 0
2 PSR B0656+14 Psr 06 59 48.1960 +14 14 19.400   24.85 24.90     ~ 804 1
3 RX J1856.6-3754 Psr 18 56 35.11 -37 54 30.5     25.7     ~ 410 0

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