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The Star-Formation History in the Vicinity of NGC 1866 in the Large Magellanic Cloud
Watson, A. M.; Holtzman, J. A.; Stapelfeldt, K. R. +15 more
To expand on the recent single WFPC2 field obtained in the vicinity of this cluster, we have measured the luminosity function in a one-third by one-half degree field in the LMC with the 40 inch telescope at Siding Spring Observator. Combining our results with recent 4-meter and WFPC2 observations, we examine the constraints on the star formation h…
The Mass of the Classical Cepheid V350 SGR
Bohm-Vitense, E.; Evans, N. R.; Carpenter, K. +2 more
Two medium resolution spectra of the hot companion of the Cepheid V350 Sgr have been obtained with the Goddard High Resolution Spectrograph aboard the Hubble Space Telescope. Comparison of these spectra (in the wavelength range 1840 to 1880 \AA) with the spectrum of $\alpha$ Lyr shows that V350 Sgr B has a projected rotation velocity which may be …
The Mount Wilson Halo Mapping Project 1975-1985 I: The UBV(RI)_M_W Photometric System Compared with Other Standard Systems: The Adopted Trigonometric HR Diagram in (R-I)_M_W and (V-I)_M_W
Sandage, A.
Photometry of stars is described that defines a UBV(RI)_M_W photometric system, established between 1975 and 1980 using the Mount Wilson 60-inch and 100-inch reflectors. The MW natural system has been reduced to the UBV(RI)_C Cape-Cousins system by linear equations for stars hotter than M0. Strong non-linear color and magnitude equations exit in R…
A New Color Image of the Crab Nebula
Wainscoat, R. J.; Kormendy, J.
A new color image of the Crab Nebula is presented. This is a 2782 × 1904 pixel mosaic of CCD frames taken through B (blue), V (green), and R (red) filters; it was carefully color balanced so that the Sun would appear white. The resolution of the final image is approximately 0.8 arcsec FWHM. The technique by which this image was constructed is desc…
Near Infrared Imaging of the Proposed z=2 Cluster Behind CL 0939+4713 (Abell 851)
Hutchings, J. B.; Davidge, T. J.
We have obtained deep J and K' images of a 90 arcsec square field containing the z=2.0 QSO that is viewed through the z=0.4 rich cluster A851. Brightnesses of individual galaxies are measured from these data, and archival F702W WFPC2 images from HST. The results are used to construct 2-colour diagrams, colour-magnitude diagrams, and luminosity fun…