COMMISSION 27 AND 42 OF THE IAU INFORMATION BULLETIN ON VARIABLE STARS Number 3825 Konkoly Observatory Budapest 8 January 1993 HU ISSN 0374 - 0676 PHOTOGRAPHIC PHOTOMETRY OF V350 Cep V350 Cep was discovered by Gyulbudaghian and Sarkissian (1977) as a star of about 17m in U- and pg-lights, and 16.5m in V-light. On the red reproduction of the Palomar Sky Survey Atlas the star is about 21m, but on the blue reproduction it is below the limit. The star is located near the emission nebula NGC 7129. The spectral observations of V350 Cep have shown that the star is a strong Halpha-emission star (Gyulbudaghian, Glushkov and Denisyuk, 1978, Magakian and Amirkhanian, 1979, Semkov and Tsvetkov, 1986). The photographic observations in the UBV system were made with the 50/70/172 cm Schmidt telescope of the National Astronomical Observatory of the Bulgarian Academy of Sciences during the period September 1984-August 1992. The plates taken on J.D. 2444493.4, 2444495.4 and 2444497.4 were obtained with the 100/130/210 cm Schmidt telescope of the Byurakan Astrophysical Observatory of the Armenian Academy of Sciences by M. Tsvetkov. We used the photometric standards in the open cluster NGC 7142 (Hoag et al., 1961). [FIGURE 1] Figure 1. Light curve of V350 Cep during observational period July 1987 - August 1992 in B light Table I. Photometric behaviour of V350 Cep in the period 1980-1992 J.D. U B V J.D. U B V 244... mag mag mag 244... mag mag mag 4493.4 - 17.2 - 8071.5 - 16.7 - 4495.4 - - 16.3 8072.4 - 17.0: 15.3 4497.4 16.7 - - 8129.4 - 16.7 - 5960.3 16.9 - - 8207.3 - 17.1 - 5961.3 - 17.4 - 8291.3 - 17.2 - 6564.5 - 16.5 15.0 8328.7 - 16.8 - 6712.4 - - 15.6 8329.6 - - 15.9 7000.4 - - 15.3 8330.5 - 17.5 16.1 7001.4 - 17.1 - 8363.4 - 17.5 16.0: 7002.4 - - 15.5 8364.5 - 17.1 - 7065.3 - 17.7 - 8366.5 - 17.3 - 7065.4 17.0 17.4 16.6 8367.5 - 17.0 16.0 7123.4 - 17.5 - 8379.5 - 17.4 - 7305.5 - 17.3 - 8382.5 - 17.0 - 7334.5 - 17.5 - 8385.4 - 17.3 - 7362.4 - 17.2 - 8430.5 16.9 17.1 - 7384.4 - 17.6 16.0 8431.5 - 17.5 - 7385.4 15.9 17.5 16.1 8469.3 - 17.4 - 7386.4 - 16.9: - 8478.4 - 16.8 - 7388.5 - 17.5 - 8511.4 17.3: 16.7 15.5 7443.3 16.6 17.5 - 8513.3 16.3 17.2 - 7448.4 - 17.7: - 8515.4 - 17.1 - 7474.3 - 17.3 16.2 8547.4 16.3 17.1 - 7475.2 - 17.6 - 8563.3 - 16.8 15.7 7644.4 - 17.3 - 8629.2 - 17.2 15.6 7707.4 - 17.4 - 8663.6 - 16.5 - 7707.5 - 17.6: - 8687.6 16.1 17.0 16.0 7733.3 - 17.4 - 8694.5 - - 15.6 7774.3 16.8 17.9: 16.1 8719.5 - - 14.8 7777.4 - 17.1 - 8734.4 - - 15.9 7829.3 17.0 17.1 - 8735.4 - 16.8 - 7830.3 16.7 17.4 - 8753.5 - 17.1 15.8 7831.3 - 17.2 15.9 8825.4 - - 16.0 7924.3 16.3 - - 8828.4 - 17.2 - 7926.6 - 16.4 15.5 8855.4 - 17.1 16.4 7947.6 - 16.7 - 8857.4 - 16.9 15.8 7948.6 16.6 16.6 - 8860.4 16.9 17.5: - 7956.6 - 16.5 - 8861.4 - 17.3 15.8 7979.5 - 16.8 - 8862.4 - 17.5: - 8071.4 - 16.6 - The previous photometric observations of V380 Cep (Gyulbudaghian and Sarkissian, 1978 and Hakverdian and Gyulbudaghian, 1978) did not show noticeable photometric changes after the first observed rise. Our photographic observations suggest that during the last five years a definite increase of brightness in B light is observed (Figure 1). A similar brightness increase is visible also in V light and the B-V colour index has not noticeable changes (Figure 2). [FIGURE 2] Figure 2. The B-V colour index of V350 Cep during observational period July 1987 - August 1992 E.H. SEMKOV Department of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences, BG-1784 Sofia, BULGARIA References: Gyulbudaghian, A.L., Sarkissian, R.A., 1977, Astr. Tsirk., 972, 7. [BIBCODE 1977ATsir.972....7G ] Gyulbudaghian, A.L., Sarkissian, R.A., 1978, Astr. Tsirk., 982, 4. [BIBCODE 1978ATsir.982....4G ] Gyulbudaghian, A.L., Glushkov, Yu.I., Denisyuk, E.K., 1978, Ap. J., 224, L137. [BIBCODE 1978ApJ...224L.137G ] Hakverdian, L.G., Gyulbudaghian, A.L., 1978, Astr. Tsirk., 1027, 3. [BIBCODE 1978ATsir1027....3H ] Hoag, A.A., Johnson, H.L., Iriarte, B., Mitchell, R.T., Hallam, K.L., Sharpless, S., 1961, Publ. U.S. Naval Obs., Second Series, 17, 349. [BIBCODE 1961PUSNO..17....1H ] Magakian, T.Yu., Amirkhanian, A.S., 1979, Astr. Tsirk, 1038, 6. [BIBCODE 1979ATsir1038....6M ] Semkov, E.H., Tsvetkov, M.K., 1986, Star Clusters and Associations, Publ. of the Ast. Dep. Eotvos Univ., Budapest, 8, 141. [BIBCODE 1986scag.conf..141S ]