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Table 2

Setup of the LOFAR-LBA beamformed observations.

Parameter Value Units
Array setup LOFAR Core
Number of stations 24
Beams ON & 2 OFF
Configuration LBA outer antennas
Antennas per station 48
Minimum frequency 26 (a) or 15 (b) MHz
Maximum frequency 74 (a) or 62 (b) MHz
Subbands recorded 244
Subband width 195 kHz
Channels per subband 64
Frequency resolution (b) 3.05 kHz
Time resolution (τ) 10.5 msec
Beam diameter (c) 13.8 arcmin
Raw sensitivity (ΔS) (d) 208 Jy
Stokes parameters IQUV

Notes. (a) Frequency range for the 55 Cnc observations. (b)Frequency range for the υ And and τ Boo observations. (c) Calculated at 30 MHz (van Haarlem et al. 2013). (d)Raw sensitivity of a pixel in the dynamic spectrum, calculated using , with Ssys the system equivalent flux density (SEFD) of one LOFAR Core station (40 kJy; van Haarlem et al. 2013), N the number of stations summed, npol is the number of polarizations (2), b the frequency resolution, and τ the time resolution.

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