Physics & Astronomy ETDs

Publication Date

5-5-1977

Abstract

In Chapter 1, I outline the methods of making ground-based infrared observations. I concentrate on the observational procedures rather than the instrumental design. Near-infrared observations of S 156A, _S 158A, S 159A, S 162A1, S 228, and G 45. 5 + 0 .1 (#2) made with a beam size of ̴1 are used to estimate the total near infrared flux. After correcting for the line of sight extinction the near infrared luminosities are greater than the Lyman-α luminosities inferred from radio observations. A strong double peaked infrared source was discovered near the region of G 25.3-0.1. The infrared source and the radio source previously reported in this region seem to be two separate sources. Peak A of the infrared source seems to be a late M star with a circumstellar dust and ice shell. Peak B seems to be an HII region with a massive ( ̴ 5-10 M0) Pre-Main Sequence exciting star. I present near infrared observations of W 49 CC#l, W 49 CC#6, W 40, G 24.8 + 0.1, G 25.4 - 0.2 and W 52. These observations were made with 46" and 63" beam sizes. Only W 49 CC#6 has been previously observed in the near infrared, and these observations were made with a 7" beam. I compute extinction coefficients for the sources that have radio observations. In Chapter 5, I present near infrared broad band and medium resolution spectral observations of Comet West (1975n). The observations show color temperatures higher than would be expected from solar heating of a grey body. This temperature difference can be explained by the emissivity of the particles in the comet varying with the wavelength.

Degree Name

Physics

Level of Degree

Masters

Department Name

Physics & Astronomy

First Committee Member (Chair)

Michael Zeilik II

Second Committee Member

David Solomon King

Third Committee Member

Colston Chandler

Language

English

Document Type

Thesis

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