J/A+AS/106/333 uvby photometry of four CP stars (Adelman+ 1994) ================================================================================ uvby Photometry of the chemically peculiar stars alpha Andromedae, HD 184905, HR 8216, and HR 8434 Adelman S.J., Brown B.H., Caliskan H., Reese D.F., Adelman C.J. =1994A&AS..106..333A ================================================================================ ADC_Keywords: Stars, peculiar; Photometry, uvby Keywords: stars: individual Alpha And - stars: individual HD 184905 - stars: individual HR 8216 - stars: individual HR 8434 - stars: chemically peculiar A Abstract: Differential Stroemgren uvby photometric observations from the Four College Automated Photoelectric Telescope of four chemical peculiar stars is presented and analyzed. The peculiar Hg-Mn star {alpha} And is found not to be a photometric variable within the errors of measurement contrary to some published studies. Observations of the magnetic CP star HD 184905 were used to refine the zero epoch and the period which was found to be 1.85435 days. Our photometry and that of Morrison & Wolff are generally quite similar. We find evidence for two sub-minima within the broad minimum in both u and y. The cool magnetic CP star HR 8216 is non-variable in agreement with previous studies that suggested it was constant or a very long period variable. The CP star HR 8434 has a period of 1.43242 days and shows a generally in phase variation of u, v, b, and y. The light curves have two nearly equally maximum and a sharp minimum. The largest amplitude is for u, 0.085 mag. Objects: ------------------------------------------------------------------- RA (2000) DE Designation(s) (File) ------------------------------------------------------------------- 00 08 23.3 +29 05 26 alpha And = HD 358 (table1.dat) 19 34 43.9 +43 56 45 HD 184905 = V1264 Cyg (table2.dat) 21 26 51.6 +48 50 07 HR 8216 = HD 204411 (table3.dat) 22 06 13.6 +56 20 36 HR 8434 = HD 210071 = V444 Cep (table4.dat) ------------------------------------------------------------------- File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 84 80 alp And uvby photometry table2.dat 84 107 HD 184905 uvby photometry table3.dat 84 67 HR 8216 uvby photometry table4.dat 84 77 HR 8434 uvby photometry -------------------------------------------------------------------------------- See also: J/A+AS/103/1 : (63 And, HD 192913, HR 8240, 108 Aqr) J/A+AS/114/253 : (HD 11187, HD 14940, HD 15144, 20 Eri & HR 8933) J/A+AS/122/249 : (HD 32633, 25 Sex, HR 7224 & HD 200311) J/PASP/109/9 : (HR 1643, Theta Aur, 49 Cam, and HR 3724) J/A+AS/125/65 : (HD 37776, HR 2258, HR 6958 & 108 Aqr) J/A+AS/125/497 : (Theta Vir and 109 Vir) J/A+AS/133/197 : (33 Tau, HD 50169 and HR 7786) J/A+AS/134/53 : (HD 15980, HR 1094, 33 Gem and HD 115708) J/A+AS/136/111 : (HD 35298, 19 Lyr, HD 192678 and HR 8216) J/A+AS/136/379 : (45 Leo, HR 4330, 49 Her and HR 6718) J/A+AS/146/13 : (20 Eri, HR 1297, 12 CMa, and HD 134214) J/A+A/368/225 : (HR 5341, HD 142070, HR 6967 & HR 8434) J/A+A/390/1023 : (HR 194, HD 32966, HD 171782, and HR 7911) J/A+A/401/357 : (60 Tau, HR 1528, HR 8216, HR 8770) Byte-by-byte Description of file: table1.dat table2.dat table3.dat table4.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 12 F12.4 d HJD Heliocentric Julian day 16- 21 F6.3 mag u(v-c) u filter variable-comparison 25- 30 F6.3 mag u(ch-c) u filter check-comparison 34- 39 F6.3 mag v(v-c) v filter variable-comparison 43- 48 F6.3 mag v(ch-c) v filter check-comparison 52- 57 F6.3 mag b(v-c) b filter variable-comparison 61- 66 F6.3 mag b(ch-c) b filter check-comparison 70- 75 F6.3 mag y(v-c) y filter variable-comparison 79- 84 F6.3 mag y(ch-c) y filter check-comparison -------------------------------------------------------------------------------- Finally average and standard deviation: ----------------------------------------------------------------------------- u v b y Star v-c ch-c v-c ch-c v-c ch-c v-c ch-c ----------------------------------------------------------------------------- alpha And average -1.585 1.288 -1.498 1.827 -1.425 1.879 -1.347 1.915 std. dev. 0.008 0.006 0.007 0.006 0.008 0.006 0.008 0.007 ----------------------------------------------------------------------------- HD 184905 average -1.732 1.555 -1.206 1.353 -1.161 1.455 -1.104 1.510 std. dev. 0.032 0.008 0.008 0.004 0.014 0.005 0.015 0.006 ----------------------------------------------------------------------------- HR 8216 (1st year, period 2448366.9982-2448439.9638) average 0.023 1.098 -0.302 1.225 -0.410 1.264 -0.475 1.306 std. dev. 0.007 0.012 0.008 0.010 0.004 0.014 0.003 0.009 (2nd year, period 2448530.7483-2448566.6251) average 0.028 1.100 -0.296 1.227 -0.405 1.264 -0.463 1.302 std. dev. 0.003 0.005 0.005 0.005 0.004 0.004 0.004 0.005 (3rd year, period 2448873.8120-2449163.9614) average 0.026 1.105 -0.298 1.227 -0.405 1.265 -0.464 1.305 std. dev 0.004 0.007 0.003 0.005 0.003 0.005 0.003 0.006 (4th year, period 2449253.7329-2449322.5885) average 0.028 1.100 -0.297 1.226 -0.405 1.259 -0.464 1.304 std. dev. 0.005 0.009 0.005 0.005 0.003 0.007 0.003 0.009 (data set) average 0.027 1.102 -0.297 1.227 -0.405 1.263 -0.464 1.304 std. dev. 0.004 0.007 0.004 0.005 0.003 0.006 0.004 0.006 ---------------------------------------------------------------------------- HR 8434 average -0.922 -0.268 -0.309 -0.368 -0.259 -0.130 -0.196 0.011 std. dev. 0.026 0.011 0.018 0.008 0.018 0.008 0.013 0.006 ---------------------------------------------------------------------------- ================================================================================ (End) Patricia Bauer [CDS] 19-Mar-1994