COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 414 Konkoly Observatory Budapest 1970 January 14 ELEMENTS OF BRIGHT SOUTHERN CEPHEIDS Photoelectric UBV photometry of 29 bright southern Cepheids has been carried out principally to provide accurate present epoch phases. The new observations enabled existing periods to be checked and revised periods were derived where necessary. The period, its probable error and the range in Julian date over which the period is valid are given in columns 3, 4 and 5 of the table. Column 2 gives the JD_max of the visual light curve only for those Cepheids whose period differed significantly from the value quoted in the second edition of the General Catalogue of Variable Stars. Apart from SZ Mon and RY Sco both of which are known to have a variable period, the remaining Cepheids showed no evidence of any variation in the period, Two recent determinations of the periods of Cepheids by Tsarevsky (1967) and Cousins (1968) have stars in common with the present Cepheids. Our agreement with Cousins is good but on comparing with Tsarevskyr's conclusions significant differences are found in many cases. The detailed observations are to be published in Monthly Notices of the Royal Astronomical Society. References Cousins, A.W.J., 1968. Mon.Not.astr.Soc. South Afr., 27, 97, [BIBCODE 1968MNSSA..27...97C ] Kukarkin, B.V., Parenago.P.P., Efremov, Yu.I. and Kholopov, P.N., 1958. The General Catalogue of Variable Stars, 2nd Ed.,, Moscow, Tsarevsky, G.S., 1967. Inf.Bull.var.Stars, I.A.U., 176. [IBVS No. 176] Table Cepheid JD_max P delta P JD 2 400 000 + (days) (days) 2 400 000 + V496 Aql -- 6.80703 0.00013 >28000 UX Car -- 3.68225 0.00002 10000 ER Car 40277.88 7.71855 0.00015 24000 V Cen 40308.60 5.49392 0.00004 13000 XX Cen 40366.24 10.95550 0.00015 19000 KN Cen 40391.22 34.035 0.002 25000 V381 Cen -- 5.07878 0.00004 27000 V419 Cen 40281.16 5.50710 0.00010 28000 V659 Cen 40348.77 5.62180 0.00015 30000 R Cru -- 5.82574 0.00003 21000 S Cru 40301.19 4.68997 0.00003 12000 T Cru -- 6.73331 0.00006 15000 *SZ Mon 40241.39 32.69 0.02 36000 S Mus 40299.42 9.66007 0.00011 24000 SY Nor -- 12.6452 0.0003 25000 BF Oph -- 4.06784 0.00002 19000 YZ Sgr -- 9.55360 0.00015 19000 AP Sgr 40390.31 5.05793 0.00004 19000 BB Sgr -- 6.63699 0.00008 19000 V350 Sgr -- 5.15424 0.00004 19000 RV Sco -- 6.06133 0.00004 14000 *RY Sco 40365.12 20.3157 0.0005 35000 V482 Sco -- 4.52786 0.00004 28000 V636 Sco -- 6.79671 0.00007 18000 R TrA -- 3.38930 0.00001 04000 S TrA -- 6.32347 0.00003 15000 V Vel -- 4.37101 0.00002 15000 RY Vel 40246.67 28.1270 0.0012 19000 AH Vel -- 4.22717 0.00003 26000 Institute of Theoretical Astronomy, Madingley Road, Cambridge England, January 1970, R.S. STOBIE