Browsing Masters Theses by Author "Welch, Gary A."

Now showing items 1-9 of 9

A search for multiple periodicities in three delta Scuti stars

Reed, Laureen G. (Halifax, N.S. : Saint Mary's University, 1986)

New photoelectric photometry and period searches are presented for three northern delta Scuti variables: LT Vulpeculae, V1208 Aquilae, and 63 Herculis. In past work, two of these three stars were shown to exhibit single-period, ...
Core radii determinations for four clusters of galaxies

Calnan, Colin,1953- (Halifax, N.S. : Saint Mary's University, 1979)

Bahcall (1975) has found that the average core radius for a group of 15 clusters of galaxies is 0.25[plus or minus]0.05 Mpc. At the suggestion of Dr. G. Welch it was decided to study four nearby clusters of galaxies (A2052, ...
Diffuse dust in elliptical galaxies

Savoy, Jonathan (Halifax, N.S. : Saint Mary's University, 2007)

It is well established that the broadband colors of elliptical galaxies become redder near their centres, which provides an important constraint on models of elliptical galaxy formation. The observed radial color gradients ...
Lunatic on a mountain : Fritz Zwicky and the early history of dark matter

Close, Tricia Lynn (Halifax, N.S. : Saint Mary's University, 2001)

Fritz Zwicky is identified commonly as the discoverer of dark matter, the unobservable mass that is believed to occupy about 90 percent of the universe. In 1933 Zwicky found a mass discrepancy in the Coma cluster of galaxies, ...
Photometric decomposition of NGC 6166

Blake, Ronald Melvin (Halifax, N.S. : Saint Mary's University, 1996)

We have used CFHT observations in Cousins B and R to probe the structure of the supergiant elliptical galaxy NGC 6166 in Abell 2199. We utilize the isophotal and aperture photometry of nuclei B and C to search for evidence ...
Properties of the molecular interstellar medium in the lenticular galaxy NGC 5866

LeBlanc, Andrew Glenn (Halifax, N.S. : Saint Mary's University, 2001)

The IRAM 30m telescope has been used to observe the J = 1-0 transition of [superscript 12]CO at several positions along the central dust lane of NGC 5866. The data were used to determine the large-scale properties of the ...
The cool interstellar medium of NGC 5866

Kacprzak, Glenn (Halifax, N.S. : Saint Mary's University, 2005)

The nearly edge---on S0 galaxy NGC 5866 is notable for its massive molecular interstellar medium, prominent central dust lane, and large IRAS 100 micron flux. The galaxy is relatively isolated, and neither the kinematics ...
The development of CCD image processing techniques and their application to surface photometry of NGC 6166

Allwright, J. W. B. (Halifax, N.S. : Saint Mary's University, 1985)

A systematic procedure for processing and reducing CCD-generated images has been developed. It involves removing unwanted objects and blemishes, subtracting the bias offset, removing the thermal background; correcting for ...
The surface brightness profiles of elliptical and supergiant galaxies

English, Darlene A. (Halifax, N.S. : Saint Mary's University, 1979)

The surface brightness profiles of a sample of supergiant and elliptical galaxies were studied. The original data were gathered by Dr. G.A. Welch, who also wrote the program (PROFIL) for the data reduction. This study ...