Wide-band simultaneous observations of pulsars: disentangling dispersion measure and profile variations

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Table 6

Constraints on emission heights for frequencies between ~40 and ~180 MHz from aberration/retardation arguments.

	Δt_A/R	α^a	ΔR	r_max
	(ms)	(°)	(km)	(km)

B0329+54	<0.65	30.8	<128	<183^b
B0809+74	<1.28	0.0^c	<384	–
B1133+16	<0.35	51.3	<59	<110
B1919+21	<0.28	45.4	<49	–

Notes. The α values are taken from Lyne & Manchester (1988). r_max was not calculated for pulsars B0809+74 and B1919+21 as the frequency evolution of their pulse profiles is not consistent with a dipolar magnetic field and simple radius-to-frequency mapping.

^(a)

Errors were not given for α in Lyne & Manchester (1988), so errors on the emission heights cannot be derived. See text for a discussion.

^(b)

Emission height of inner cone.

^(c)

0.0 was used to provide an upper limit because alpha is unavailable for B0809+74.

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