COMMISSION 27 OF THE I. A. U. INFORMATION BULLETIN ON VARIABLE STARS NUMBER 526 Konkoly Observatory Budapest 1971 February 26 PHOTOELECTRIC OBSERVATIONS OF THE FLARE STAR UV Cet DURING THE 1970 SEPTEMBER 22 - OCTOBER 9 INTERNATIONAL PATROL The preliminary results of UV Cet observations carried out at the Catania Astrophysical Observatory during the 1970 campaign arranged by the IAU Working Group on Flare Stars are here reported. The observations were performed in b light with a 91 cm cassegrain reflector which fed a single channel photometer equipped with an EMI 6256 A (S13) photomultiplier and the following combination of Schott filters: RG12/1+ GG13/2. In Table 1 the detailed coverage and in Table 2 the characteristics of the 59 flares observed in 46.8 hours of patrol are presented. The meaning of symbols used is the same as in I.B.V.S. No. 525, Assuming that the observed flares have been produced in the atmosphere of the B component of UV Cet (L 726-8 AB), the observed intensities have been corrected as follows: I_o = 0.38 I (observed), The light curves of the observed flares are shown in the accompanying Figures Nos. 1 - 16. The meaning of the "uncertainty" bars close at each flare light curve is also explained in I.B.V.S. Nos. 525, R. Barbagallo, S. Cristaudo and C. Lo Presti have collaborated to the present work. S. CRISTALDI and M. RODONO' Catania Astrophysical Observatory, Italy February 13, 1971 Table 1 ------------------------------------------------------------------------------- DATE COVERAGE (U.T.) 3sigma/I_o ------------------------------------------------------------------------------- 1970 Sep. 22 00h10m-00h21m; 0026-0119; 0121-0158; 0201-0.31; 0333-0343. .07 22 2300-2308; 2314-2329; 2338-2340 23 0103-0115; 0208-0222; 0225-0249; 0315-0342. .07 23 2250-2348; 24 0007-0015; 0037-0045; 0050-0250; 0252-0310; 0312-0334. .07 24 2207-2320; 2337-2400 25 0000-0013; 0015-0030; 0041-0127; 0129-0132; 0204-0249 0251-0309; 0312-0334. 26 2201-2213; 2216-2228; 2256-2313; 2315-2327; 2329-2331; 27 0007-0029; 0028-0049; 0049-0055; 0131-0145; 0149-0305; 0310-0343. .07 27 2345-2357; 2359-2400 28 0000-0014; 0027-0032; 0052-0150; 0207-0212; 0249-0345. .05 28 2120-2134; 2136-2155; 2157-2159; 2208-2214; 2217-2220; 2222-2244; 2247-2309; 2314-2318; 2359-2400 29 0000-0037; 0039-0100; 0102-0119; 0121-0137; 0140-0236 0238-0249; 0251-0312; 0315-0324; 0329-0334; 0338-0342; 0345-0343. .03 29 2329-2335; 2343-2358 30 0000-0027; 0029-0032; 0035-0109; 0108-0122; 0124-0149 0150-0205; 0210-0233; 0248-0308. .03 Oct. 1 0001-0014; 0019-0017; 0030-0035; 0037-0059; 0058-0103; 0244-0343. .03 3 0118-0131; 0149-0200; 0202-0230; 0232-0238; 0240-0249; 0248-0253; 0304-0335. .03 4 0102-0120; 0122-0129; 0132-0139; 0145-0148. .03 4 2130-2212; 2216-2231; 2257-2306; 2309-2324; 2329-2358 5 0030-0048; 0049-0100; 0105-0120; 0122-0134; 0135-0148; 0151-0204 0212-0223; 0229-0242; 0244-0257; 0302-0319; 0321-0342; 0344-0348. .03 Oct. 5 21h27m-21h47n; 2150-2158; 2211-2215; 2253-2308; 2334-2349; 2351-2400; 6 0000-0006; 0040-0102; 0104-0121; 0125-0138; 0140-0153; 0155-0219; 0221-0235; 0242-0300:. .04 8 2124-2130; 2140-215. .05 T 2125-2201; 2205-2238; 2243-2247; 2254-2259; 2300-2305; 2309-2321; 8 0127-0205; 0216-0250; 0258-0311; 0333-0341. .04 9 0109-0119; 0121-0128; 0202-0218; 0225-0248; 0250-0302; 0305-0315; 0317-0328; 0330-0344. .04 10 0037-0052; 0054-0113; 0116-0134; 0139-0156; 0157-0207; 0212-0215; 0217-0220; 0221-0228; 0229-0231; 0239-0244. .02 ------------------------------------------------------------------------------- For the explanation of symbols see the footnotes to the Tables in I.B.V.S. no. 525. Table 2 ---------------------------------------------------------------------------- no. t_max(U.T.) d_b d_a 3sigma/I_0 (I_f / I_0)_max P a b ---------------------------------------------------------------------------- 1970 Sep. 1 22:00h48.2m 0.0m 6.3m .08 0.62 0.78 2 2 01 13.4 0.0 0.1 .08 0.82 0.04 2 3 02 20.4 0.1 10.0 .08 4.53 2.88 3 4 23:02 09.3 0.3 5.8 .08 0.75 0.86 3 5 02 16.6 0.1 0.8 .08 1.03 0.42 3 6 02 40.1 0.3 8.9 .08 2.90 3.63 4 3 7a 23 19.1 ( s e c o n d a r y m a x i m u m ) 7b 23 20.7 ( s e c o n d a r y m a x i m u m ) 7c 23 21.0 ( " " ) 7d 23 24.5 ( " " ) 7e 23 26.2 ( " " ) 7f 23 31.0 0.2 11.6 .07 6.90 8.72 3 2 8 24:01 29.2 0.1 4.8 .07 0.72 0.66 2 9 02 18.3 0.1 2.4 .07 3.61 1.05 2 10 02 42.6 0.1 1.6 .07 2.76 0.55 2 11 22 16.3 0.2 7.6 .08 1.06 1.12 2 12a 22 24.9 0.2 19.5 .08 2.17 5.84 3 2 12b 22 30.5 ( s e c o n d a r y m a x i m u m ) 12c 22 31.3 ( " " ) 13a25:02 07.3 ( " " ) 13b 02 13.6 0.1 10.6 .04 1.53 5.20 3 2 13c 02 18.9 ( s e c o n d a r y m a x i m u m ) 14a 02 33.8 0.1 7.4 .05 3.82 4.22 2 3 14b 02 34.7 ( s e c o n d a r y m a x i m u m ) 15 03 19.9 0.1 7.8 .07 2.58 2.84 2 16a 26:22 57.2 0.1 5.3 .04 1.57 1.82 2 3 16b 22 57.6 ( s e c o n d a r y m a x i m u m ) 17 23 22.1 0.0 1.0 .07 1.40 0.34 3 18 27:00 43.9 0.0 5.6 .07 0.40 0.60 1 3 19 02 50.0 1.5 .05 2.14 2 20a 23 50.4 0.7 3.7 .08 2.10 1.92 2 2 20b 23 52.0 ( s e c o n d a r y m a x i m u m ) 21 28:01 09.6 0.1 0.1 .03 3.65 20.52 3 2 22 01 22.1 0.4 9.7 .03 7.23 20.52 3 2 23 01 39.8 0.1 9.4 .03 4.54 7.06 2 24 03 24.9 0.2 2.6 .02 0.92 0.58 1 2 25 23 57.4 0.1 1.6 .02 2.24 ? 3 2 29 29:00 09.2 0.1 0.6 .02 0.63 0.08 2 27 00 47.1 0.1 1.8 .02 1.23 0.76 2 28 01 23.8 0.0 2.1 .02 0.86 0.34 2 29 02 01.3 0.1 0.9 .02 0.59 0.22 2 30a 02 06.9 0.2 7.2 .02 3.39 3.66 3 2 30b 02 12.5 ( s e c o n d a r y m a x i m u m ) 31n 02 42.4 ( " " ) 31b 02 43.4 0.0 6.1 .03 2.66 1.50 2 2 32 30:00 23.8 0.0 0.6 .04 0.57 0.06 1 2 33 00 29.6 0.1 0.1 .04 0.73 0.07 2 34 00 50.1 0.0 0.5 .04 0.69 0.12 2 35 01 18.2 0.2 0.5 .04 1.17 0.20 4 36 01 50.6 0.1 1.0 .04 2.49 0.55 4 37 03 03.2 0.9 1.1 .04 0.77 0.25 4 Oct. 38 1:00 02.1 0.2 5.5 .03 2.69 2.48 4 2 39 02 46.3 0.5 1.6 .07 1.68 1.29 2 40 03 07.5 0.0 1.5 .07 5.00 0.48 2 41 03 09.2 0.0 0.3 .07 1.14 0.15 4 2 42 4:21 42.3 0.1 4.5 .04 2.83 0.68 3 43a 22 03.0 0.1 13.1 .03 5.49 7.54 2 3 43b 22 03.2 ( s e c o n d a r y m a x i m u m ) 44a 5:01 25.8 ( s e c o n d a r y m a x i m u m ) 44b 01 28.3 0.0 14.4 .03 6.79 10.40 3 3 44c 01 30.3 ( s e c o n d a r y m a x i m u m ) 45 02 34.9 0.3 6.2 .04 1.27 1.56 3 46 5:02 54.6 0.2 1.3 .04 0.83 0.40 3 47 03 27.3 0.1 0.4 .04 1.70 0.12 3 48 23 02.1 0.1 3.0 .03 1.50 0.68 4 49a 6:00 56.4 ( s e c o n d a r y m a x i m u m ) 49b 00 56.8 ( " " ) 49c 00 58.1 0.3 9.5 .04 1.69 2.22 3 4 50 01 15.6 0.2 3.4 .04 0.76 0.74 4 51 02 05.9 0.2 1.1 .04 2.11 0.48 4 52 21 52.8 0.1 0.1 .04 0.97 0.10 2 53 8:01 39.0 0.1 1.3 .04 2.18 0.60 2 54 01 42.1 0.2 0.1 .04 1.74 0.22 2 55 02 45.4 0.0 0.8 .07 1.18 0.12 2 56 9:02 43.9 0.1 1.1 .04 3.84 0.66 2 57 03 26.4 0.1 0.4 .07 1.29 0.24 2 58 10:01 02.4 0.0 1.0 .03 0.79 0.14 1 59a 01 21.8 ( s e c o n d a r y m a x i m u m ) 59b 01 24.6 0.2 13.4 .03 18.11 14.10 3 1 59c 01 28.9 ( s e c o n d a r y m a x i m u m ) ----------------------------------------------------------------------- For the explanation of symbols see the footnotes to the Tables in I.B.V.S. no. 525. [FIGURE 1] [FIGURE 2] [FIGURE 3] [FIGURE 4] [FIGURE 5] [FIGURE 6] [FIGURE 7] [FIGURE 8] [FIGURE 9] [FIGURE 10] [FIGURE 11] [FIGURE 12] [FIGURE 13] [FIGURE 14] [FIGURE 15] [FIGURE 16]