COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 427 Konkoly Observatory Budapest 1970 April 12 LIST OF PROBABLE DELTA SCUTI STARS There is recently a tremendous progress in the search of Delta Scuti stars. Some years age only five stars of this type were known, today their number already reached almost fourty. Below a list of 45 bright stars which are probable variables of Delta Scuti type is given. Published photoelectric data for these stars permit us to suspect light variability with the typical amplitude of some hundredths of a magnitude. All these stars have spectral classes in the range A0-F6 and luminosity classes III-V (or other indications of the luminosity in this range). Colour indices (B-V) and (U-B) of the suspected variables indicate the typical location of Delta Scuti stars in the (U-B)-(B-V) diagram:somewhat below the main sequence. Radial velocities of these stars are as small as those of Delta Scuti variables. In column seven of the Table the absolute magnitudes based on the values of the trigonometric parallax (Pi >= 0"030) are represented. If the M_v value is not "trigonometric" that is explained in the remarks which are indicated by asterisks. In column eight the values of the radial velocities are given. No HD CSV V B-V Sp M_v V_r 1 1404 100011 4.53 0.05 A2V - - 8 km/s 2 6763 - 5.67 0.32 F2V +2.6 + 7 3* 6961 100091 4.32 0.17 A7V - + 9 4* 11838 100148 2.64 0.13 A5V +1.6 - 2 5 16765 102388 5.80 0.51 dF6 - + 8 6 18881 100212 6.30 0.06 A2V - + 6 7* 17584 - 4.22 0.34 F2III +1.75 +14 8 17904 102394 5.34 0.43 F4IV - + 6 9* 19978 100263 5.45 0.19 A4n +1.8 + 4 10 21447 100281 5.08 0.05 A1V - 0 11* 23567 102421 8.28 0.36 A9V - +10 12* 26015 102432 6.01 0.40 F3V - +36 13 27290 6101 4.25 0.32 F2IV +2.9 +27 14* 30020 6130 6.83 0.38 F5III +1.6 +40 15* 40873 100709 6.45 0.18 A7III +1.54 +20 16 43378 102500 4.47 0.01 A2V +2.2 - 4 17 48737 100763 3.34 0.44 F5IV +1,8 +25 18 85130 102547 6.44 0.46 dF6 - -13 19* 56537 100844 3.58 0.11 A5V +1.7 -9 20* 57749 - 5.84 0.35 gF3 +0.25 +11 21* 60489 6589 6.53 0.23 Am +1,29 +46 22* 71297 100957 5.58 0.22 dF0 +2.50 +27 23* 87696 6770 4.48 0.19 A7V +2.37 -18 24 97903 101190 2.55 0.13 A4V +0.6 -21 25 99028 101199 3.93 0.41 F2IV +2.3 -10 26 102847 101225 2.12 0.09 A3V +1.5 0 27* 107259 101264 3,88 0.03 A2V - +2 28 111604 6964 5.90 0.15 A2V - -14 29* 116842 101383 4.01 0.16 A5V +1.91 -8 30 118232 101392 4.70 0.12 A5V +2.1 -12 31 125161 101436 4.75 0.20 A7V +3.0 -17 32 128167 - 4.45 0.36 F2V +3.5 0 33* 137391 - 4.30 0.30 F0V +1.9 -10 34* 142105 101534 4.31 0.04 A3V - -16 35* 148898 7382 4.45 0.12 A7p +1.8 + 2 36* 159561 101982 2.08 0.15 A5III +0.8 +13 37 164136 - 4.48 0.39 F2III - -22 38* 173648 101763 4.37 0.18 A4m +0.76 -26 39* 182940 101835 3.36 0.32 F0IV-V +2.4 -30 40 192514 102988 4.83 0.10 A5IIIn - -21 41* 192696 - 4.32 0.12 A3V - -26 42* 202444 102076 3.73 0,38 F5IV +2.0 -21 43* 210418 102151 3.52 0.08 A2V +1.6 -6 44* 217782 103110 5.08 0,08 A3Vn +3.7 + 2 45 222602 102277 5.88 0.10 A3Vn - + 1 Remarks 3 = HII 6961. Spectroscopic binary, 4 = HD 11638: Spectroscopic binary, 7 = BD 17584: O.J.Eggen (ApJ 155, 701, 1969) considers this star to be a Delta Scuti variable and gives M_v(s) from ubvy-photometry 9 = BD 19978: M_vis is obtained from the spectroscopic parallax (W.S.Adams et al., ApJ 81, 187, 1935). 11 = HD 23587: In the Pleiades cluster (HII No 1266). 12 = BD 26015: In the Hyades cluster. 14 = BD 30020: F-component of the double system. O.J. Eggen (ApJ 155, 701, 1969) considers thie star to be a Delta Scuti variable and gives M_v(s) value from the ubvy-photometry. 15 = HD 40873: I.J.Danziger and R.J.Dickens (ApJ 149, 55, 1967) suspected light variability. M_v(s) from ubvy-photometry. 19 = HD 56537: Spectroscopic binary. 20 = HD 57749: M(s) from ubvy-photometry. 21 = HD 60489: Metallic star. Mv(s) from ubvy-photometry. 22 = HD 71297: Probable metallic star. M_v(e) from ubvy- photometry. 23 = HD 86696: M_v(s) from ubvy-photometry, Amplitude of light variation is about 0m.09. Mean period is near 0d.1 according to G.Jackisch (VSS 5, H.1, 1963). 27= HD 107259: Spectroscopic binary. 29= HD 116842: Member of UMa cluster. 33= HD 137391: Spectroscopic binary. 34= HD 142105: Light variability suspected by R.H.Baker (PASP 38, 95, 1926) from photoelectric data. 35= HD 148898: Sr, Cr-star. 36= HD 159561: Spectroscopic triple with P = 0d.96, 38= HD 173648: A-component of a Beta Lyrae system.Spectroscopic binary with P = 4d.30. Metallic star, M_v from C.R.Tolbert (ApJ 139, 1105, 1964). 39= HD 182640: Spectroscopic binary. Vr varies with P=3h48m and amplitude of 40 km/s. 41= HD 192696: Probable spectroscopic binary. 42= HD 202444: Spectroscopic binary with P = 0d.143. 43= HD 210418: Probable spectroscopic binary. 44= HD 217782: B-component of ADS 16467 system. M. S. FROLOV Astronomical Council of the Academy of Sciences in the USSR