IAU COMMISSION 27 UNPUBLISHED DATA FILE 242E UBVRI data for LQ Hya The photometric observations were made simultaneously and contemporaneously to the spectroscopic observations with the 0.6-m University of Hawaii telescope on Mauna Kea, the 0.6-m University of Toronto telescope at Las Campanas Observatory, Chile and with the 0.6-m Lowell telescope at Cerro Tololo Interamerican Observatory (CTIO) between Jan 13 and Feb 12, 1991. All observations were made differentially with respect to HD 82477 as the comparison star and HD 82508 as the check star and utilized Johnson UBV and Cousins RI filters. The average nightly standard errors varied from site to site and bandpass to bandpass. The Hawaii and CTIO data show comparable scatter in the $UBV$ bandpasses, but the Hawaii RI measurements have much smaller standard errors than the data from the Chilean sites. Standard errors of approximately 20 mmag were encountered in the U band due to the significantly lower photon count level. The individual UBV(RI)_C observations are available from the IAU Comm. 27 ``Archive for Unpublished Variable Star Photometry'' as file 242E. All observations presented in this paper were phased with our new ephemeris of HJD = 2448270.0 + 1.606 x E where the initial epoch is arbitrary and the period is the best photometric period from a least-squares fit to our entire data set. We adopt this as the rotation period of LQ Hya. Klaus G. Strassmeier Institute for Astronomy University of Vienna Tuerkenschanzstrasse 17 A-1180 W i e n AUSTRIA ******************************************************************************* %///////////////////////////////////////////////////////////////////// % % UBVRI data for LQ Hya A&ALaTex version % (K. G. Strassmeier et al.) % %///////////////////////////////////////////////////////////////////// \documentstyle{laamt} \begin{document} \title{Surface features of the lower atmosphere of HD 82558 = LQ Hya} \author{K. G. Strassmeier\inst{1}\thanks{Visiting astronomer: Canada-France-Hawaii Telescope, operated by the National Research Council of Canada, the Centre National de la Recherche Scientifique de France and the University of Hawaii} \and J. B. Rice\inst{2}$^\star$ \and W. H. Wehlau\inst{3}$^\star$ \thanks{Guest observer: Mauna Kea Observatory of the Institute for Astronomy, University of Hawaii} \and G. M. Hill\inst{3}$^{\star\star}$ \and J. M. Matthews\inst{4} \thanks{Visiting astronomer: Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatories, operated by the Association of Universities for Research in Astronomy, Inc., under contract with the National Science Foundation} \thanks{Guest observer, University of Toronto Southern Observatory, Las Campanas, Chile}} \institute{Institut f\"ur Astronomie, Universit\"at Wien, T\"urkenschanzstra\ss e 17, A-1180 Wien, Austria \and Department of Physics, Brandon University, Brandon, Manitoba R7A 6A9, Canada \and Department of Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada \and D\'epartement de Physique, Universit\'e de Montr\'eal, Montr\'eal H3C 3J7, Canada } \maketitle \section{Observations and data reductions} The photometric observations were made simultaneously and contemporaneously to the spectroscopic observations with the 0.6-m University of Hawaii telescope on Mauna Kea, the 0.6-m University of Toronto telescope at Las Campanas Observatory, Chile and with the 0.6-m Lowell telescope at Cerro Tololo Interamerican Observatory (CTIO) between Jan 13 and Feb 12, 1991. All observations were made differentially with respect to HD 82477 as the comparison star and HD 82508 as the check star and utilized Johnson $UBV$ and Cousins $RI$ filters. The average nightly standard errors varied from site to site and bandpass to bandpass. The Hawaii and CTIO data show comparable scatter in the $UBV$ bandpasses, but the Hawaii $RI$ measurements have much smaller standard errors than the data from the Chilean sites. Standard errors of approximately 20 mmag were encountered in the $U$ band due to the significantly lower photon count level. The individual $UBV(RI)_C$ observations are available from the IAU Comm. 27 ``Archive for Unpublished Variable Star Photometry'' as file 242E. All observations presented in this paper were phased with our new ephemeris of \begin{equation} HJD = 2448270.0 + 1.606 \times E, \end{equation} where the initial epoch is arbitrary and the period is the best photometric period from a least-squares fit to our entire data set. We adopt this as the rotation period of LQ Hya. \newpage %--------------------- T a b l e s ----------------------- \begin{table} \caption{LQ Hya - HD 82477 (Las Campanas, Chile)} \begin{flushleft} \begin{tabular}{lllllll} \hline HJD 2448+ & phase & $U$ & $B$ & $V$ & $R$ & $I$ \\ \hline 270.7067& 0.440& 0.000& 0.000& 0.000& 1.752& 1.804\\ 270.8647& 0.538& 0.000& 1.490& 1.718& 1.771& 1.825\\ 271.6728& 0.041& 0.000& 1.508& 1.738& 1.800& 1.845\\ 271.8132& 0.129& 0.000& 1.451& 1.688& 1.770& 1.833\\ 272.6714& 0.663& 0.000& 1.510& 1.731& 1.817& 1.854\\ 272.8237& 0.758& 0.000& 1.536& 0.000& 1.841& 1.877\\ 273.7841& 0.356& 0.000& 1.391& 1.641& 0.000& 0.000\\ 274.6691& 0.907& 0.000& 1.503& 1.742& 1.803& 1.866\\ 274.8001& 0.988& 0.000& 1.518& 1.732& 1.816& 1.850\\ 275.6825& 0.538& 0.000& 1.478& 1.710& 1.788& 1.830\\ 275.8090& 0.617& 0.000& 1.495& 1.727& 1.812& 1.857\\ 276.6760& 0.156& 0.000& 1.468& 1.694& 1.758& 1.835\\ 276.8565& 0.269& 0.000& 1.375& 1.654& 1.732& 1.807\\ 277.7639& 0.834& 0.000& 1.529& 1.745& 1.820& 1.867\\ 277.8528& 0.889& 0.000& 1.495& 1.730& 1.817& 1.852\\ 278.6797& 0.404& 0.000& 1.412& 1.643& 1.735& 1.803\\ 278.8055& 0.482& 0.000& 1.462& 1.692& 1.769& 1.834\\ 279.6693& 0.020& 0.000& 1.489& 1.728& 1.809& 1.859\\ 280.6527& 0.632& 0.000& 1.507& 1.726& 1.803& 1.857\\ 280.8240& 0.739& 0.000& 1.511& 1.745& 1.822& 1.867\\ 281.6347& 0.244& 0.000& 1.418& 1.652& 1.738& 1.811\\ 281.7878& 0.339& 0.000& 1.398& 1.644& 1.735& 1.782\\ 281.8572& 0.382& 0.000& 1.396& 1.647& 1.756& 0.000\\ \hline \end{tabular} \end{flushleft} \end{table} \begin{table} \caption{LQ Hya - HD 82477 (Mauna Kea, Hawaii)} \begin{flushleft} \begin{tabular}{lllllll} \hline HJD 2448+ & phase & $U$ & $B$ & $V$ & $R$ & $I$ \\ \hline 286.9922& 0.579& 0.958& 1.488& 1.716& 1.794& 1.841\\ 287.0117& 0.591& 0.962& 1.496& 1.722& 1.794& 1.840\\ 287.0234& 0.599& 0.966& 1.500& 1.724& 1.798& 1.844\\ 287.0430& 0.611& 1.011& 1.510& 1.733& 1.802& 1.844\\ 287.0742& 0.630& 0.987& 1.489& 1.709& 1.787& 1.838\\ 287.0898& 0.640& 1.018& 1.524& 1.738& 1.808& 1.853\\ 287.1055& 0.650& 1.003& 1.520& 1.742& 1.808& 1.851\\ 287.1250& 0.662& 0.992& 1.524& 0.000& 0.000& 0.000\\ 287.8359& 0.104& 0.954& 1.473& 1.710& 1.792& 1.833\\ 287.8555& 0.117& 0.928& 1.469& 1.706& 1.784& 1.835\\ 287.8672& 0.124& 0.921& 1.460& 1.704& 1.787& 1.837\\ 287.9219& 0.158& 0.909& 1.451& 1.688& 1.773& 1.823\\ 287.9375& 0.168& 0.913& 1.447& 1.679& 1.770& 1.820\\ 287.9531& 0.177& 0.887& 1.446& 1.679& 1.762& 1.821\\ 288.0781& 0.255& 0.852& 1.404& 1.655& 1.738& 1.795\\ 289.9180& 0.401& 0.902& 1.436& 1.667& 1.749& 1.801\\ 289.9297& 0.408& 0.909& 1.439& 1.675& 1.752& 1.810\\ 289.9453& 0.418& 0.907& 1.446& 1.673& 1.754& 1.812\\ 289.9609& 0.427& 0.903& 1.443& 1.677& 1.756& 1.812\\ 289.9766& 0.437& 0.908& 1.445& 1.677& 1.757& 1.814\\ 289.9844& 0.442& 0.916& 1.446& 1.679& 1.756& 1.813\\ 290.0000& 0.452& 0.918& 1.446& 1.682& 1.762& 1.816\\ 290.0156& 0.461& 0.919& 1.451& 1.683& 1.765& 1.813\\ 290.0313& 0.471& 0.934& 1.453& 1.684& 1.763& 1.817\\ 290.0469& 0.481& 0.931& 1.457& 1.688& 1.765& 1.816\\ 290.0586& 0.488& 0.920& 1.457& 1.691& 1.767& 1.822\\ 290.0742& 0.498& 0.941& 1.462& 1.696& 1.771& 1.824\\ 290.0938& 0.510& 0.924& 1.466& 1.694& 1.773& 1.824\\ 290.1094& 0.520& 0.961& 1.478& 1.699& 1.775& 1.826\\ 290.1250& 0.530& 0.961& 1.475& 1.700& 1.775& 1.829\\ 290.8242& 0.965& 0.974& 1.528& 1.730& 1.817& 1.848\\ \hline \end{tabular} \end{flushleft} \end{table} \newpage \begin{table} \caption{LQ Hya - HD 82477 (CTIO, Chile)} \begin{flushleft} \begin{tabular}{lllllll} \hline HJD 2448+ & phase & $U$ & $B$ & $V$ & $R$ & $I$ \\ \hline 285.7384& 0.799& 1.029& 1.528& 1.736& 1.805& 1.852\\ 286.6099& 0.341& 0.893& 1.422& 1.650& 1.749& 1.811\\ 286.6939& 0.393& 0.939& 1.437& 1.662& 1.748& 1.809\\ 286.8588& 0.496& 0.973& 1.477& 1.690& 1.771& 1.834\\ 287.6630& 0.997& 0.983& 1.507& 1.725& 1.804& 1.861\\ 287.8289& 0.100& 0.956& 1.483& 1.702& 1.789& 1.842\\ 287.8723& 0.127& 0.964& 1.475& 1.726& 1.775& 1.827\\ 288.5924& 0.575& 1.005& 1.508& 1.713& 1.786& 1.836\\ 288.6823& 0.631& 1.020& 1.525& 1.729& 1.790& 1.835\\ 288.8587& 0.741& 1.068& 1.541& 1.744& 1.797& 1.834\\ 289.6548& 0.237& 0.898& 1.421& 1.653& 1.743& 1.816\\ 289.8448& 0.355& 0.909& 1.428& 1.655& 1.725& 1.775\\ 290.5933& 0.821& 1.002& 1.520& 1.736& 1.797& 1.841\\ 290.6847& 0.878& 0.983& 1.504& 1.729& 1.798& 1.847\\ 290.7555& 0.922& 0.984& 1.511& 1.728& 1.796& 1.836\\ 290.8582& 0.986& 0.985& 1.503& 1.725& 1.801& 1.855\\ 291.6662& 0.489& 0.940& 1.470& 1.686& 1.763& 1.826\\ 291.7089& 0.516& 0.986& 1.477& 1.693& 1.776& 1.829\\ 291.8374& 0.596& 1.010& 1.503& 1.714& 1.777& 1.819\\ 291.8589& 0.609& 1.017& 1.515& 1.725& 1.806& 1.865\\ 292.6696& 0.114& 0.967& 1.484& 1.706& 1.778& 1.823\\ 292.7516& 0.165& 0.934& 1.462& 1.684& 1.765& 1.814\\ 292.8175& 0.206& 0.918& 1.436& 1.664& 1.744& 1.796\\ 292.8685& 0.238& 0.880& 1.426& 1.657& 1.744& 1.813\\ 293.6817& 0.744& 1.025& 1.529& 1.734& 1.796& 1.837\\ 293.7740& 0.801& 1.016& 1.516& 1.729& 1.793& 1.832\\ 293.8463& 0.846& 1.003& 1.518& 1.731& 1.793& 1.841\\ 293.8682& 0.860& 1.011& 1.511& 1.720& 1.789& 1.846\\ 294.6646& 0.356& 0.886& 1.423& 1.650& 1.728& 1.784\\ 294.7733& 0.424& 0.933& 1.446& 1.671& 1.742& 1.791\\ 294.8660& 0.481& 0.953& 1.468& 1.685& 1.766& 1.819\\ 295.6937& 0.997& 0.996& 1.512& 1.730& 1.806& 1.860\\ 295.8552& 0.097& 0.953& 1.483& 1.703& 1.780& 1.828\\ 296.6732& 0.606& 1.011& 1.514& 1.725& 1.790& 1.839\\ 296.8423& 0.712& 0.995& 1.520& 1.726& 1.795& 1.850\\ 296.8690& 0.728& 0.983& 1.515& 1.720& 1.786& 1.831\\ 297.6707& 0.227& 0.900& 1.433& 1.668& 1.745& 1.801\\ 298.6776& 0.854& 1.004& 1.504& 1.721& 1.787& 1.832\\ 298.8574& 0.966& 0.975& 1.507& 1.722& 1.796& 1.849\\ 299.6553& 0.463& 0.953& 1.471& 1.699& 1.780& 1.841\\ 300.6115& 0.058& 1.002& 1.508& 1.721& 1.805& 1.859\\ 300.8646& 0.216& 0.902& 1.437& 1.671& 1.754& 1.814\\ \hline \end{tabular} \end{flushleft} \end{table} %----------------------------------------------------------------------- \begin{thebibliography}{} \bibitem[1991]{cuti} Cutispoto, G., 1991, A\&AS 89, 435 \bibitem[1986a]{fek:bop} Fekel, F. C., Bopp, B. W., Africano, J. L., Goodrich, B. D., Palmer, L. H., Quigley, R., Simon, T., 1986a, AJ 92, 1150 \bibitem[1990]{jet} Jetsu, L., 1990, in: Muionen, K., et al. (eds.), Proc. Finnish Astr. Soc., p. 5 \end{thebibliography} \end{document} %------------------------- end of document