COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 3407 Konkoly Observatory Budapest 27 December 1989 HU ISSN 0374 - 0676 RADIAL VELOCITIES OF SOME BRIGHT SOUTHERN STARS The Bright Star Catalogue (Hoffleit 1982) is a widely used publication that is often referenced. Most of the data columns are fairly complete, but there are gaps in the photometric, radial velocity and stellar duplicity columns. The most common radial velocity data omissions are of course for early spectral types, which are typically difficult to measure either because of the very broad lines commonly caused by high stellar rotation or the relatively few lines in the spectra of these stars. However there are quite a number of stars with a spectral type of F or later and it was thought to be useful to obtain their radial velocities. The edition of the catalogue used here contains data compiled through 1979, so it is possible that some of these values have already been obtained elsewhere and are not known to this author. The data in Table 1 were obtained when a list was drawn up to act as a fill-in program between other program requirements. There is no astrophysical significance in the structure of the list. The criteria for selection from the Bright Star Catalogue were as follows: 1. mag 6 (V) or brighter, 2. south of the Equator, 3. F5 or later spectral type, 4. no radial velocity entry in the Catalogue, 5. any companion noted that would not be excluded from the spectrograph slit width must be too faint to contaminate the brighter spectrum. (However, any physical companion would still be contributing to the brighter star's radial velocity.) Two observations were made of each object. Most spectra were obtained centered at H-alpha (6563 A), but some of the earlier observations were made centered at 5010 A. This means that some pairs of spectra are not directly comparable, but since only radial velocities, and not line profile information, were being determined, the same spectral region was not required. The observations were made at the Mount John University Observatory, Lake Tekapo, New Zealand. All observations at 6563 A were made with a 1872 element Reticon detector (Mac- Queen 1986) operated at -130degC using a Cassegrain echelle spectrograph (Hearnshaw 1977; 1978) mounted on the McLellan 1-m telescope operating at f/8. At 6563 A the dispersion is 2.28 A mm E-1. With 15 micron pixels, this corresponds to 66 pixels mm E-1 or about 1.5 km s E-1 per pixel. The free spectral bandwidth between the end masks of the Reticon is just over 60 A at this position. All observations at 5010 A were made with the spectrograph located in the dataroom adjacent to the dome, where it was thermally and mechanically stable. In these cases the spectrograph utilised a 105 micron single fibre feed (Kershaw & Hearnshaw 1989). A hollow cathode Thorium-Argon calibration lamp was used for all frames. This is built into the spectrograph. The observations at 5010 A used the same lamp type, but built into the telescope end of the fibre feed module. All the radial velocities were extracted from the data using a cubic dispersion solution on the Thorium-Argon frame, after the customary flat-field and fixed-pattern manipulations were applied. All pre-existing data in Table 1 were obtained verbatim from the Bright Star Catalogue. The exposure date column is in day-month-year format. The exposures times are in minutes. (The exposure times may seem long for a 1-m telescope, but this is due to the high dispersion of the spectrogaph, and also the approximately 50% light loss in the fibre-feed.) All radial velocities (in km s E-1) are with respect to the Sun. (The radial velocities obtained are listed to 0.01 km s E-1. Obviously it is not being claimed that this is the degree of accuracy. The last digit has been rounded already and has only been included so users can evaluate the rest of the number as they wish.) The `rms mA' column refers to the root mean square uncertainty (in mA) in the dispersion solution from the Thorium-Argon calibration lamp, whereas the standard deviation (`Std.dev') is that obtained from the scatter in velocities over the number of lines (`# fines') used in the stellar frame. Special attention is drawn to stars HR 5617,6207,6648 and 6818. These stars show distinct velocity differences at their two epochs. Table 1. Program Star Data HR HD V Sp. Type Date Exp. HJD Region RV rms mA # lines Std.dev Del.mag Sep." 2440000+ 5391 126241 5.85 K3 III 4-4-89 60 7621.072 5010 -10.14 3.25 16 .69 6-8-89 45 7685.859 6563 -19.16 2.23 15 .69 5389 126109 6.07 K0-1III 3-4-89 90 7620.227 5010 - 8.28 3.14 16 .53 8-6-89 35 7685.900 6563 - 9.47 2.77 14 .65 5408 126862 5.83 K1III 4-4-89 90 7621.172 5010 +78.29 3.03 15 1.23 8.2 35.4 8-6-89 42 7685.533 6563 +78.58 2.93 13 .40 5547 131425 5.93 G8II 9-4-89 105 7626.030 5010 +0.44 2.85 12 1.36 8-6-89 40 7686.014 6563 +0.48 1.20 9 .59 5585 132604 5.89 K2-3III 9-4-89 120 7626.121 5010 +42.01 1.56 17 1.03 8-6-89 40 7686.050 6563 +42.71 2.73 41 .72 5525 130650 5.65 G8-K0III 11-4-89 90 7627.869 5010 +14.60 3.59 11 .63 8-7-89 60 7715.846 6563 +13.92 1.87 16 .55 5617 133631 5.77 G8III 11-I-89 90 7618.039 5010 -10.42 1.43 16 .82 10-7-89 60 7717.879 6563 - 3.39 3.62 13 .74 5636 131255 5.98 G8III 11-4-89 100 7628.115 5010 -34.30 1.67 18 1.16 27-7-89 30 7734.965 6563 -34.86 0.16 10 .21 5715 117066 5.71 K5-M0III 12-4-89 90 7628.957 5010 - 9.18 3.18 15 1.23 27-7-89 20 7735.052 6563 -10.47 2.49 12 .52 5767 138505 5.82 M2III 12-4-89 120 7629.038 5010 -38.70 2.92 12 1.26 27-7-89 40 7734.995 6563 -40.15 2.77 1? .67 5919 191691 5.80 K0-1III 7-5-89 126 7654.059 5010 -3.45 2.43 10 .74 27-7-89 30 7735.031 6563 - 3.63 2.46 13 .61 5955 143346 5.70 K1IIICNII 11-4-89 90 7617.951 5010 +19.57 2.19 18 1.00 27-7-89 30 7735.142 6563 +49.60 3.92 14 .65 6044 145833 5.92 K0III 13-5-89 61 7660.219 6563 -22.02 1.41 16 .52 25-7-89 30 7733.007 6563 -23.15 1.10 11 .38 6073 116690 5.77 K0III 15-5-89 60 7737.038 6563 - 1.10 2.52 17 .67 25-7-89 40 7661.900 6563 - 0.52 2.85 14 .62 Table 1(cont.) HR HD V Sp. Type Date.Exp. HJD Region RV rms mA # lines Std.dev Del.mag Sep." 2440000+ 6085 147225 5.88 G3II 15-5-89 60 7661.994 6563 -11.27 2.04 16 .91 3.8 40.7 26-7-89 30 7733.870 6563 -11.43 2.69 12 .50 6122 148247 5.79 K1IIICNII 15-5-89 50 7622.037 6563 -14.16 2.19 17 .84 26-7-89 30 7733.895 6563 -14.19 1.79 13 .65 6207 150576 5.96 G8III 17-5-89 40 7664.045 6563 -13.75 2.79 17 .88 6.0 40 26-7-89 32 7733.921 6563 -17.17 1.89 10 .42 -15.88 4 .26 6221 151078 5.48 K0III 17-5-89 35 7664.151 6563 - 9.48 3.24 17 .94 16-7-89 30 7733.951 6563 - 9.86 2.42 13 .66 6266 152293 5.88 F5Ib-II 17-5-89 30 7664.178 6563 -37.62 1.40 18 2.72 26-7-89 30 7733.976 6563 -37.33 0.63 7 .57 6288 152820 5.48 K5III 27-5-89 90 7674.005 6563 -78.08 2.68 12 .52 26-7-89 20 7733.998 6563 -77.62 3.09 15 .79 6311 153368 5.97 K2IIICNII 27-5-89 30 7674.033 6563 +17.63 3.71 12 1.29 +15.52 7 .58 26-7-89 30 7734.019 6563 +16.99 3.76 41 .71 6374 155035 5.84 M1-M2III 15-5-89 50 7662.173 6563 +20.68 1.80 15 .66 10-7-89 30 7718.071 6563 +21.96 1.36 15 .50 6404 155970 5.99 K1III 15-5-89 32 7662.206 6563 - 0.96 3.99 15 1.08 5.1 4.2 24-7-89 30 7731.974 6563 - 2.96 2.75 12 .82 7.0 20 6408 156091 5.91 K2IIICN 15-5-89 40 7662.235 6563 - 5.19 3.74 17 .88 8.4 20.2 10-7-89 30 7718.111 6563 - 4.15 2.45 17 .48 6456 157097 5.93 K1III 30-5-89 40 7676.950 6563 -36.79 2.14 16 .51 3.6 2.0 24-7-89 45 7732.006 6563 -37.22 3.40 13 .53 6438 156768 5.88 G8Ib-II 17-5-89 40 7663.915 6563 -10.07 4.30 17 .93 10-7-89 30 7718.135 6563 -10.12 2.96 11 .52 6442 156854 5.80 G8-K0III 27-5-89 40 7674.250 6563 - 6.84 2.50 14 .67 10-7-89 30 7718.163 6563 - 5.29 1.49 10 .52 6648 162391 5.84 G8III 30-5-89 40 7676.998 6563 -15.44 2.57 15 .62 24-7-89 45 7732.043 6563 -25.07 2.54 11 .61 6643 162189 5.96 K2III 27-5-89 30 7674.221 6563 -85.08 2.09 11 .64 6.5 23.6 17-1-89 40 7732.079 6563 -84.80 0.88 11 .73 7.2 30 6624 161814 5.78 K0III 27-5-89 30 7674.279 6563 +16.34 2.43 19 .54 1-7-89 45 7716.143 6563 +17.83 3.24 18 .66 6691 163652 5.74 G8III 27-5-89 30 7674.195 6563 -88.08 1.52 15 .61 2.4 51.7 14-7-89 40 7732.110 6563 -88.56 2.51 15 .61 6818 167096 5.46 G8-K0III 27-5-89 30 7674.170 6563 -27.54 1.94 15 .86 8-7-89 30 7716.176 6563 -19.84 1.94 17 .76 6837 167714 5.95 K2III 8-6-89 45 7686.191 6563 -14.07 2.97 15 .64 10-7-89 30 7718.188 6563 -12.97 2.72 16 .84 MICHAEL CLARK MOUNT JOHN UNIVERSITY OBSERVATORY P.O. Box 56 LAKE TEKAPO NEW ZEALAND References Hearnshaw, J.B.: 1977, Proc. Astron. Soc. Australia 3, 102. [BIBCODE 1977PASAu...3..102H ] Hearnshaw, J.B.: 1978, Sky and Telescope 56,6. [BIBCODE 1978S&T....56....6H ] Hoffleit, D.: 1982, Bright Star Catalogue (Yale Univ.0bs.; New Haven). Kershaw, G.M. & Hearnshaw, J.B.: 1989, Southern Stars 33,89. [BIBCODE 1989SouSt..33...89K ] MacQueen, P.J.: 1986, Ph.D thesis, Univ.of Canterbury, Christchurch, New Zealand.