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Polarimetry of Be stars at 1.25 and 2.2 micronsJones, Terry Jay January 1977 (has links)
Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1977. / Bibliography: leaves 95-96. / Microfiche. / viii, 96 leaves ill
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An observational study of the pre-main sequence Herbig Ae/Be starsGarrison, Loring Milliken, January 1900 (has links)
Thesis--Wisconsin. / Vita. Includes bibliographical references (leaves 102-104).
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A stability analysis of the equatorial regions of rapidly rotating B stars /Sonneborn, George January 1980 (has links)
No description available.
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The formation of late O and early B stars within dense molecular cloudsBeichman, Charles Arnold January 1979 (has links)
Photocopy of typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1979. / Bibliography: leaves 127-138. / Microfiche. / x, 138 leaves ill., maps 29 cm
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The distribution of O and early B stars, gas and cosmic dust across the Carina spiral featureMiller, Ellis Wilson, 1939- January 1971 (has links)
No description available.
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A search for pulsating B-type variable stars in the southern open clusters NGC 6204 and Hogg 22 / Jacobus Johannes (Jaco) MentzMentz, Jacobus Johannes January 2013 (has links)
The theory of stellar evolution and stellar structure relies on the observation of stars
in di erent phases of their evolutionary cycle. The relation between observations and
theory can be strengthened by obtaining observational data of a large sample of stars in a particular evolutionary phase. The search for Cephei stars, as conducted in this study,
can contribute to the sample of known Cephei stars, where these interesting stars are
massive non-supergiant early B-type stars, displaying pulsating behaviour which is not
well understood.
Stars tend to form in clusters where it can therefore be expected that young massive
stars can be found in open clusters. For this reason two young southern open clusters
were observed in order to search for B-type pulsating stars. The region of NGC 6204
and Hogg 22 was observed over a period of thirteen nights in Johnson B, V and I bands.
NGC 6204 is believed to be the oldest cluster of the two at a distance of 0.8 kpc while the
much younger Hogg 22 is more distant at 2.8 kpc. These two open clusters are located
6 arcminutes apart which made it possible to observe them simultaneously with a 12.8
12.8 arcminute eld of view. The observations were done with the newly installed 1600
telescope of the North-West University, South Africa.
In order to do a variability search, periodic stars need to be identi ed from the cluster
data, where a typical data set may contain thousands of scienti c images. In addition
to the main motivation for this study, a pipeline was created in order to automate the
photometry and data reduction processes. A Lomb-Scargle transform was applied to the
stellar light curves in order to identify periodic sources. 354 signi cantly periodic stars
were identi ed from the 3182 observed stars. Amongst them, two new possible Cephei
stars were found together with a possible slowly pulsating B star (SPB), and numerous
eclipsing binary systems.
By using photometry of this region obtained by Forbes & Short (1996), instrumental
magnitudes were transformed to a standard system in order to compare photometry
results. From the constructed colour magnitude diagram of the two clusters, it could be
seen that some stars, indicated by Forbes & Short (1996) to be cluster members, were
in fact eld stars belonging to neither cluster. The reduction and photometry pipeline was implemented successfully on the data set,
which also highlighted the importance of instrumentation and correct data analysis
procedures. Possible improvements were identi ed in order to overcome di culties experienced
during this study. / Thesis (MSc (Space Physics))--North-West University, Potchefstroom Campus, 2013
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A search for pulsating B-type variable stars in the southern open clusters NGC 6204 and Hogg 22 / Jacobus Johannes (Jaco) MentzMentz, Jacobus Johannes January 2013 (has links)
The theory of stellar evolution and stellar structure relies on the observation of stars
in di erent phases of their evolutionary cycle. The relation between observations and
theory can be strengthened by obtaining observational data of a large sample of stars in a particular evolutionary phase. The search for Cephei stars, as conducted in this study,
can contribute to the sample of known Cephei stars, where these interesting stars are
massive non-supergiant early B-type stars, displaying pulsating behaviour which is not
well understood.
Stars tend to form in clusters where it can therefore be expected that young massive
stars can be found in open clusters. For this reason two young southern open clusters
were observed in order to search for B-type pulsating stars. The region of NGC 6204
and Hogg 22 was observed over a period of thirteen nights in Johnson B, V and I bands.
NGC 6204 is believed to be the oldest cluster of the two at a distance of 0.8 kpc while the
much younger Hogg 22 is more distant at 2.8 kpc. These two open clusters are located
6 arcminutes apart which made it possible to observe them simultaneously with a 12.8
12.8 arcminute eld of view. The observations were done with the newly installed 1600
telescope of the North-West University, South Africa.
In order to do a variability search, periodic stars need to be identi ed from the cluster
data, where a typical data set may contain thousands of scienti c images. In addition
to the main motivation for this study, a pipeline was created in order to automate the
photometry and data reduction processes. A Lomb-Scargle transform was applied to the
stellar light curves in order to identify periodic sources. 354 signi cantly periodic stars
were identi ed from the 3182 observed stars. Amongst them, two new possible Cephei
stars were found together with a possible slowly pulsating B star (SPB), and numerous
eclipsing binary systems.
By using photometry of this region obtained by Forbes & Short (1996), instrumental
magnitudes were transformed to a standard system in order to compare photometry
results. From the constructed colour magnitude diagram of the two clusters, it could be
seen that some stars, indicated by Forbes & Short (1996) to be cluster members, were
in fact eld stars belonging to neither cluster. The reduction and photometry pipeline was implemented successfully on the data set,
which also highlighted the importance of instrumentation and correct data analysis
procedures. Possible improvements were identi ed in order to overcome di culties experienced
during this study. / Thesis (MSc (Space Physics))--North-West University, Potchefstroom Campus, 2013
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