Return to Home Page
Dear colleagues, I examined VRI photometry of the fields of AS 323, Pe2-16, V443 Her and V503 Her taken with 40cm telescope at Brno observatory in seven to ten nights in 2002 (some data were taken together with Petr Sobotka and Jan Skalicky). The images were processed automatically with respect to comparison stars measured by Henden (Henden & Munari 2000). The field photometry was searched for new variable stars using algorithm described e.g. in Pojmanski, 2000 (astro-ph/0005236), and implemented to VARFIND by Lukas Kral (http://kral.astronomy.cz/soft/varfind/). Four new variable stars and one suspected variable were revealed. Pej 008 = GSC 5126 3535 in the field of AS 323 RA=18:48:31.1, Dec=-06:42:49 (J2000) The star is not in USNO A2.0 but is definitely red and thus probably low amplitude semiregular. There are some technical problems with processing I band images of this field so I do not report I band magnitudes: 20020612.9188 11.59Rc 20020706.0113 11.64Rc 20020722.9653 11.61Rc 20020727.9024 11.67Rc 20020819.8681 11.42Rc 20020830.8435 11.34Rc 20021026.7493 11.36Rc 20020612.9208 13.95Vc 20020706.0133 13.94Vc 20020722.9676 13.94Vc 20020727.9022 13.98Vc 20020819.8680 13.73Vc 20020830.8434 13.73Vc 20021026.7491 13.63Vc Pej 009 in the field of AS 323 RA=18:48:22.5, Dec=-06:43:13 The star is definitely very red on my images although USNO A2.0 gives B-R=0.2 mag. This might be some higher amplitude star. V band measurements are useless so I don't report them: 20020612.9188 12.86Rc 20020706.0113 12.68Rc 20020722.9653 12.48Rc 20020727.9024 12.54Rc 20020819.8681 12.54Rc 20020830.8435 12.44Rc 20021026.7493 13.08Rc Pej 010 in the field of AS 323 RA=18:48:16.4, Dec=-06:40:04 USNO A2.0 gives B-R=2.9 mag, perhaps low amplitude SR again. 20020612.9188 12.97Rc 20020706.0113 13.03Rc 20020722.9653 12.93Rc 20020727.9024 12.98Rc 20020819.8681 12.60Rc 20020830.8435 12.56Rc 20021026.7493 12.50Rc Pej 011 in the field of Pe2-16 RA=18:54:04.2, Dec=-04:38:31.8 The star is not in USNO A2.0, but the colour is definitely very red -> another probable low amplitude SR. No precise photometry for stars in this field was published, so the measurements are only _differential_ against GSC 5123 0380 (TYC2: V=11.4, B-V=0.6). Please not that quality of R band measurements is low. 20020612.9243 1.84Ic 20020706.0163 1.90Ic 20020722.9703 1.99Ic 20020727.9063 2.00Ic 20020819.8721 1.76Ic 20020830.8474 1.77Ic 20021026.7533 1.83Ic 20020612.9255 4.09Rc 20020706.0175 4.09Rc 20020722.9719 4.64Rc 20020727.9061 4.08Rc 20020819.8726 3.68Rc 20020830.8472 3.60Rc 20021026.7531 3.91Rc Also, star GSC 2076 0938 in the field V503 Her seems to be a low amplitude variable star. However, it is not red and the variations might be short period. Used observational pattern also does not permit effective observations of stars with short periods. Thus, this star remains to be "suspected". Unfortunately, no new variable stars in the field of V443 Her. Best regards, Ondrej Pejcha
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
