Table 3: Radial velocities for 29 target stars. Each star occupies N lines, with N the number of spectra/exposures obtained (Table 1). Columns: (1) HD number; (2) spectral type and luminosity class; (3) multiplicity (SB: spectroscopic binary; C: Hipparcos component binary; G: Hipparcos acceleration binary; S: Hipparcos suspected non-single - field H61); (4) the number of suitable standard stars $N_{\rm s}$ and, between brackets, the associated total number of exposures $N_{\rm e}$ (Sect. 4.4); (5) the average distance to the $N_{\rm s}$ standard stars (Sect. 4.6); (6) exposure number ( $1,\ldots,N$; asterisks denote suspect exposures related to detector instability - see Sect. 3 for details); (7) heliocentric Julian date of the mid-point of the exposure (HJD 24507XX.XXXXX); (8) final distance-weighted radial velocity $v_{\rm rad}$ (km s-1; Eq. (3) in Sect. 4.4); (9) corresponding standard deviation $\sigma _{v,{\rm rad}}$ (km s-1; Sect. 4.6); (10) time-averaged radial velocity $\overline {v}_{\rm rad}$ using the N exposures (km s-1; spectroscopic binaries show a dash; Sect. 4.6); (11) corresponding standard deviation $\sigma _{\overline {v},{\rm rad}}$ (km s-1; values smaller than 2.0 km s-1 are optimistic; Sect. 4.6); (12) literature radial velocity (km s-1); (13) source of literature radial velocity (Col. 12) and remarks (B52: Blaauw 1952; BvA: Blaauw & van Albada 1963; Z83: Zentelis 1983).
HD SpT Mult. $N_{\rm s}$($N_{\rm e}$) $\overline{d}$ Expos. HJD $v_{\rm rad}$ $\sigma _{v,{\rm rad}}$ $\overline {v}_{\rm rad}$ $\sigma _{\overline {v},{\rm rad}}$ $v_{\rm lit}$ Remark
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13)
18830 A0 C 5(16) 0.69 1 61.34014 5.1 3.2 3.8 1.5 $10.5 \pm 5.6$ Grenier et al. (1999)
      5(16) 0.69 2 61.36894 2.2 3.4        
      5(16) 0.69 3 61.39773 4.1 3.3        
19216 B9V   6(16) 0.69 1 66.49641 7.8 3.4 8.9 1.3 $ 4.5 \pm 2.7$ Grenier et al. (1999)
      6(16) 0.69 2 66.52524 10.3 3.5        
      6(16) 0.69 3 66.55355 8.7 3.6        
19567 B9   6(16) 0.69 1 54.62964 1.7 3.6 2.6 1.3    
      6(16) 0.69 2* 54.65873 3.5 3.8        
20113 B8   4( 9) 0.67 1 66.58191 6.1 4.7 6.2 2.4    
      4( 9) 0.67 2 66.61018 4.3 4.8        
      4( 9) 0.67 3* 66.63902 4.7 5.2        
      4( 9) 0.67 4 66.66758 9.5 4.3        
20987 B2V G 3( 7) 0.34 1 54.68775 -22.6 5.7 -22.1 0.8   SpT from Abt (1985)
      3( 7) 0.34 2 54.71652 -21.5 4.5        
21483 B3III   4( 8) 1.05 1 66.36154 -4.0 3.5 -3.6 0.5 $-6.0 \pm 0.5$ B52
      4( 8) 1.05 2* 66.39006 -3.2 3.5        
21856 B1V   4(10) 0.86 1 65.36623 29.7 3.3 29.7 3.3 $31.5 \pm 3.0$ Z83
22114 B8Vp   4( 9) 0.67 1 65.67265 4.7 3.2 6.1 1.9    
      4( 9) 0.67 2* 65.70122 7.4 3.4        
22951 B0.5V S 4( 9) 1.11 1 62.38453 19.3 6.3 19.3 6.3 $19.6 \pm 3.0$ Z83
23060 B2Vp   5(10) 0.55 1 65.41966 19.2 4.0 21.1 2.6 $28.5 \pm 0.9$ BvA
      5(10) 0.55 2 65.44917 22.9 4.0        
23180 B1III C+SB 4(10) 1.00 1* 63.61336 -6.1 3.3 - - $12.2 \pm 0.5$ Stickland & Lloyd (1998)
      4(10) 1.00 2 63.65607 6.4 3.1        
      4(10) 1.00 3 65.34880 80.2 4.2        
23268 A0   5(16) 0.69 1 55.42518 3.8 3.6 4.1 0.6 $-20.0 \pm 8.5$ Duflot et al. (1995)
      5(16) 0.69 2 55.45426 3.7 3.6        
      5(16) 0.69 3 55.48318 4.8 3.6        
23478 B3IV...   4( 8) 0.79 1 65.39109 15.8 4.0 15.8 4.0 $25.1 \pm 3.0$ Z83; BvA: $16.4 \pm 1.1$
23597 B8   4( 9) 0.67 1 65.55700 17.0 4.9 16.0 2.6    
      4( 9) 0.67 2* 65.58543 13.0 4.9        
      4( 9) 0.67 3 65.61373 17.9 4.8        
23625 B2.5V C+SB 5(10) 0.76 1 62.40834 1.7 3.0 - - $20.0 \pm 1.0$ Blaauw & van Hoof (1963)
23802 B5Vn C 1( 2) 0.00 1 54.35920 -53.8 1.8 -52.3 6.2   SpT from Guetter (1977)
      1( 2) 0.00 2 54.38800 -57.6 2.6        
      1( 2) 0.00 3 54.41664 -45.5 0.1        
24012 B5   2( 3) 0.37 1 54.44633 26.4 1.0 26.8 0.5 $36.9 \pm 1.7$ BvA; SpT from BvA
      2( 3) 0.37 2 54.47538 27.1 1.1        
24131 B1V   4(10) 0.86 1* 63.57544 26.6 3.8 25.8 1.2 $23.2 \pm 2.7$ Z83
      4(10) 0.86 2* 63.59810 24.9 3.6        
24190 B2V SB 5(10) 0.55 1 62.56051 21.3 4.6 - - $26.7 \pm 5.8$ Lucy & Sweeney (1971)
      5(10) 0.55 2* 62.58902 22.2 4.6        
24398 B1Ib   1( 3) 1.12 1 62.37038 20.1 1.2 20.1 1.2 $21.6 \pm 4.1$ Z83
24583 B7V   4( 7) 1.06 1 55.55760 25.7 4.7 26.2 5.7 $25.4 \pm 1.4$ BvA; SpT from Guetter (1977)
      4( 7) 1.06 2 55.58646 26.7 4.8        
      4( 7) 1.06 3 55.61537 19.9 4.5        
      4( 7) 1.06 4 55.64456 35.2 4.8        
      4( 7) 1.06 5 55.67345 23.6 5.0        
24640 B1.5V S 5(12) 0.87 1 63.45678 22.9 4.1 22.9 4.1 $17.7 \pm 0.7$ BvA
24970 A0   5(16) 0.69 1* 55.33716 25.3 3.3 23.2 2.2 $20.4 \pm 0.3$ Z83
      5(16) 0.69 2 55.36676 23.2 3.5        
      5(16) 0.69 3 55.39538 21.0 3.5        
25539 B3V   4( 8) 0.89 1 62.43707 19.0 3.6 19.0 3.6 $23.8 \pm 0.3$ Z83
25799 B3V... SB 4( 8) 0.89 1 62.48414 38.3 4.0 - - $24.3 \pm 0.8$ Morris et al. (1988)
      4( 8) 0.89 2 62.51369 38.4 3.9        
25833 B5V:p C+SB 2( 3) 0.37 1* 63.53867 31.6 1.2 - - $24.7 \pm 0.9$ Popper (1974)
26499 B9   6(16) 0.69 1 54.57089 21.8 3.6 20.3 2.2    
      6(16) 0.69 2 54.60061 18.7 3.6        
278942 B3III C 2( 3) 0.37 1 66.43613 30.8 2.5 31.4 0.8   SpT from Cernis (1993)
      2( 3) 0.37 2 66.46811 32.0 2.8        
281159 B5V C 2( 3) 0.37 1 65.49889 9.1 1.8 8.5 0.9   $v_{\rm rad}$ variable
      2( 3) 0.37 2 65.52757 7.8 2.1        


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