COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS Number 2810 Konkoly Observatory Budapest 15 October 1985 HU ISSN 0374 - 0676 NEW PHOTOELECTRIC LIGHT CURVES OF EH Lib EH Lib (BD -0deg2911) was first discovered to be variable in light by A.N. Vyssotsky and since this time it attracts the attention of many investigators and a large number of photographic and photoelectric observations were obtained eg., Code (1950), Ashbrook (1952), Alania (1954), Fitch (1957), Burnicki and Krygier (1958), Sanwal and Pande (1961), Harding and Penston(1966), Fitch et al. (1966), Epstein (1969), Boardman and Heiser (1972), Terzan and Rutily (1974), McNamara and Feltz (1976), Broglia and Conconi (1977), Garrido et al. (1979) and finally by Mahdy and Szeidl (1980). EH Lib was observed during four nights in March 1985, (21, 22, 23, and 26) at Kottamia Observatory in B and V colours. The observations were carried out with the one beam photoelectric photometer using standard B and V filters, and an EMI 9558 B photomultiplier cooled by a propeller fan. During the observations a number of standard stars of known magnitudes from Johnson's et al.. Catalogue (1966) were frequently observed to determine the extinction coefficients. The comparison star observed with EH Lib was the star BD -0deg2909. The observations obtained in the present work yielded to 8 light curves, 4 in each colour (Figures 1-8) and seven times of maxima in both B and V colours. The times of maxima obtained are listed in Table I. The results obtained clearly show that the star EH Lib has a constant period and its light curves are characterised by constant shape which is repeated successively. This is in agreement with the results obtained by Mahdy and Szeidl (1980). Table I New observed times of maxima of star EH Lib Hel.Max.J.D. Filter E O-C 2446146.5086 B 143733 +0.0001 .5084 V -0.0001 .5967 B 143734 -0.0002 .5967 V -0.0002 2446147.4811 B 143744 +0.0001 .4814 V +0.0004 .5696 B 143745 +0.0002 .5694 V 0.0000 [FIGURE 1] Table I (cont.) Hel.Max.JD. Filter E O-C 2446148.4533 B 143755 -0.0002 .4537 V +0.0002 .5420 B 143756 0.0000 .5419 V -0.0001 2446151.5479 B 143790 -0.0001 .5482 V +0.0002 M. A. HAMDY Helwan Observatory, Egypt References: Alania, I.F., 1954, Astron.Circ., 146, 14. Ashbrook, K.J., 1952, Astron.J. 57, 64. [BIBCODE 1952AJ.....57Q..64A ] Boardman, W.J., and Heiser, A.M., 1972, P.A.S.P., 84, 680. [BIBCODE 1972PASP...84..680B ] Broglia, P., and Conconi, P., 1977, Astron.Astrophys.Suppl. 29, 231. [BIBCODE 1977A&AS...30..231B ] Burnicki,A., and Krygier, B., 1958, Acta Astr. 8, 21. [BIBCODE 1958AcA.....8...21B ] Code, A.D., 1950, P.A.S.P., 62, 166. [BIBCODE 1950PASP...62..166C ] Epstein, I., 1969, Astron.J., 74, 1131. [BIBCODE 1969AJ.....74.1131E ] Fitch, W.S., 1957, Astron.J. 62, 108. [BIBCODE 1957AJ.....62..108F ] Fitch, W,S., Wisniewski, W.Z., Johnson, H.L., 1966 Commun Lunar Planetary Lab. 5, No. 71. [BIBCODE 1966CoLPL...5...71F ] Garrido, R. et al., 1979, Astron.Astrophys.Suppl. 36, 51. [BIBCODE 1979A&AS...36...51G ] Harding, G.A., and Penston,M.J., 1966, Roy.Obs.Bull. No. 115. [BIBCODE 1966RGOB..115..279H ] Johnson, H.L., Mitchell, R.I., Iriarte, B., Wisniewski, W.Z., 1966, Commun Lunar Planet.Lab. 4, No. 63. [BIBCODE 1966CoLPL...4...99J ] Mahdy, H.A. and Szeidl, B., 1980, Commun.Konkoly Obs.Hung.Acad.Sci., Budapest, No. 74. [BIBCODE 1980CoKon..74....1M ] [CoKon No. 74] McNamara, D.H. and Feltz, K.A. 1976, P.A.S.P. 88, 164. [BIBCODE 1976PASP...88..164M ] Sanwal, N.B. and Pande, M.C., 1961, The Observatory 81, 99. [BIBCODE 1961Obs....81..199S ] Terzan, A., and Rutily, B., 1974, Astron.Astrophys.Suppl. 16, 155. [BIBCODE 1974A&AS...16..155T ]