Engineering topics
Hill, R.
Publications and source records attributed to Hill, R..
Joint Group on Pollution Prevention: Partnering for Progress
This viewgraph presentation outlines the Joint Group on Pollution Prevention (JG-PP) partnership. Details are given on what groups comprise JG-PP, the proven methodology for what JG-PP can accomplish, the common problems, joint solutions, and shared efforts, and some of the JG-PP projects.
The Hubble Space Telescope Extragalactic Distance Scale Key Project. X. The Cepheid Distance to NGC 7331
The distance to NGC 7331 has been derived from Cepheid variables observed with HST/WFPC2, as part of the Extragalactic Distance Scale Key Project. Multi-epoch exposures in F555W(~V) and F814W (~1), with photometry derived independently from DoPHOT and DAOPHOT/ALLFRAME programs, which were used to detect a total of 14 reliable Cepheids, with periods between 11 and 42 days.
Distance to the Virgo Cluster Galaxy M100 from Hubble Space Telescope Observations of Cepheids
Accurate distances to galaxies are critical to determining the present expansion rate of the Universe or Hubble Constant (H(sub 0)). An important step in resolving the current uncertainty in H(sub 0) is the measurement of the distance to the Virgo cluster of galaxies. New observations using the Hubble Space Telescope yield a distance of 17.1 +/- 1.8 Mpc to the Virgo cluster galaxy M100. This distance leads to a value of H(sub 0) = 17 km/sec/Mpc. A comparable value of H(sub 0) is also derived from the Coma cluster using independent estimates of its distance ratio relative to the Virgo cluster.
Hubble Space Telescope First Observations of the Brightest Stars in the Virgo Galaxy M100 = NGC 4321
As part of both the Early Release Observations fromthe Hubble Space Telescope and the Key PRoject on the Extragalctic Distance Scale, we have obtained multi-wavelength BVR WFPC2 images for the face-on Virgo cluster spiral galaxy M11 = NGC 4321.
The Initial Mass Function for Massive Stars in the Magellanic Clouds. I. UBV Photometry and CM Diagrams for 14 OB Associations
This paper presents data used to construct color-magnitude diagrams for the purposes of investigating the massive-star content of the associations.
The Initial Mass function for Massive Stars in the Magellanic Clouds. III. Luminosity and Mass Functions for 14 OB Associations
This paper describes the use of UBV photometry of 14 associations in the Large and Small Magellanic Clouds to derive luminosity and mass functions for the most massive stars in the associations.
The Hubble Space Telescope Extragalactic Distance Scale Key Project KK: Photometry of WFC Images of M81
This paper describes the Extragalactic Distance Scale Key Project for Hubble Space Telescope which aims to employ the Cepheid period-luminosity relation to measure galaxy distances out as far as the Virgo cluster.