Diane Turnshek

Carnegie Mellon University | CMU · Department of Physics

The spatial and angular emission patterns of artificial and natural light emitted, scattered, and reflected from the Earth at night are far more complex than those for scattered and reflected solar radiation during daytime. In this commentary, we use examples to show that there is additional information contained in the angular distribution of emit...

The spatial and angular emission patterns of artificial and natural light emitted, scattered, and reflected from the Earth at night are far more complex than those for scattered and reflected solar radiation during daytime. In this commentary, we use examples to show that there is additional information contained in the angular distribution of emit...

Polar ring galaxies are early type galaxies (S0 disks or ellipticals) that have rings of gas, dust, and stars in rotation on orbits approximately perpendicular to the plane of their central disks. These unusual galaxies are believed to be the product of galaxy interactions. We present CCD images of one kinematically confirmed polar ring galaxy and...

This atlas presents spectra of 75 standard stars representing the temperature and luminosity sequences for G, K, M, S and C stars. The spectra were recorded with a Reticon system spectrograph at the Cassegrain focus of the StewardObservatory 2.3 m telescope. The recorded wavelength range is either 4200 - 7900 Å or 4500 - 8200 Å at a resolution of 8...

Spectral scans of 74 G, K, M, C, and S stars, many from the Atlas of Spectra of the Cooler Stars (Keenan and McNeil, 1976), have been made with the Steward Observatory Red Reticon system to form an atlas of red spectral standard stars (Turnshek et al., 1983). Here the authors review the atlas by presenting plots of relative flux versus wavelength,...

A list of 103 faint red stars in a 0.7-square-degree area located near NGC 6820/23 on the galactic plane in the constellation Vulpecula is presented. The stars were chosen from Near Infrared Photographic Sky Survey visual and near-IR photographic pairs and were selected for their visual faintness as well as their red colors. Positions, approximate...

Spectroscopy and polarimetry of several very red stars, noted on Near Infrared Photographic Sky Survey photographs in the region of NGC 1333, have yielded a 'map' suggesting the extent of polarization arising from a two-cloud structure in the region. Spectral types and color indices of the stars make it possible to infer that grain radii in the clo...

Recently, Walsh, Carswell and Weymann1 reported the discovery of two objects (0957+56A,B) with identical spectra and separated by 6 arc min. They suggested that a gravitational lens was responsible. The cumulative result of subsequent work on this object (see refs 2–9) corroborates this interpretation. The example of 0957+56A,B and the data present...