3,468 research outputs found
A theoretical study of population II Cepheids with periods in the range 10-20 days
No full textA theoretical study of population II variables with
periods in the range 10 - 20 days (W Virginis variables) is
presented. A modified hydrodynamic Christy code is used in
conjunction with the Carson opacities, in preference to the Los
Alamos tables, following the work of Carson, Stothers and
Vemury on the shorter period BL Herculis variables.
Twenty-five survey models are presented, along with nine other
comparison models of varying masses and opacities.
A study of the observations shows that the division of
these variables into two types by observers might be explained
by a slightly different mass for each type, thus making the
division dependent on the star's previous evolution.
The non-linear results obtained by this study show that a
mass of 0.6 M☉ is a good one to use, and that M = 0.5 M☉ makes
little difference (although M = 0.8 M☉ seems to be too high).
The results in general compare well with the observations, as
both also show the split into two types of light curve. Three good models of individual stars are presented, on a par with the models of BL Herculis published by Carson, Stothers and
Vemury. The bumps in the light and velocity curves of many of
the models seem to be real, caused by the Christy "echo".
A few of the models show some RV Tauri behaviour. One in
particular shows very strange behaviour, involving a violent
81ternation of light curve shapes. Models constructed using
the Los Alamos opacities do not produce results as consistent
with observations as those of the main survey.
The study shows that these stars can be represented by
hydrodynamic models of mass 0.6 M☉ using the Carson opacities, but also that convection may be important in the cooler stars in order to model them accurately. This indicates the
direction in which further theoretical work may lie
Translations of the Self: A.E. Housman and Anne Carson, Between Scholarship and Creativity
No full textIn my PhD thesis I have explored some aspects of the interface between classical scholarship and creativity, through the work and careers of two scholar-poets, Anne Carson (1950 - ) and A.E. Housman (1859-1936). I have shown how, within their social and cultural contexts, they attempted to craft their careers by using both genres of their work to help them construct carefully-crafted public profiles, and how these self-translations within their careers relate to received versions of their work by different readerships. By connecting explorations of their social and cultural contexts with their biographies and with close readings of their scholarly and creative work, I explore the shifting relationship between creative and scholarly ‘cultural fields’, as well as the recent social, cultural, and institutional changes which have turned these fields from ‘homogeneous poles’ to ‘heterogeneous poles’ (to use Pierre Bourdieu’s terms). I examine the surprising similarities in the unusual personalities of Carson and Housman, who both have, or had, a tendency to use their reputations for independence and reclusiveness to help them navigate around important issues and conflicts which could have threatened their success. I show how they have constructed versions of themselves, both within and beyond their writings, which have enabled them to make grand assertions of the self in the teeth of social and cultural necessities
Letter from John L. Stewart, Field Agent, United States Department of Agriculture Farm Security Administration to Carson Estate Company, May 20, 1942
No full textRefers to check payment for land "taken over" by William J. Cammack. Handwritten notes by Carson Estate Company regarding pending lease and payment deposits
Letter from [John Victor Carson], Dominguez Estate Company to MR. John L. Wyatt, June 20, 1938
No full textReferring Mr. Wyatt to Mr. H.H. Jarrett concerning land sales
Carson Crosses Canada by L. Bailey
No full textBailey, Linda. Carson Crosses Canada. Illustrated by Kass Reich. Tundra Books of Random House Canada, 2017.In this delightful picture book, Linda Bailey and Kass Reich combine their talents to produce an imaginary cross-Canada tour for little listeners and beginning readers. The work is age appropriate. The maps Reich creates on the front and back end papers present a simplified vision of our coastlines, territories and provinces. Throughout the pages, line drawings and colourful illustrations evoke our mountains, forests, plains and lakes. We see Canada from the highway, the campsite, the lakeshore and seacoast. Urban references are few. The journey starts in Tofino; it ends on an unnamed Newfoundland shore. En route, there is one nod to Winnipeg where the travelers have a cooling romp in the lake of the same name, and another to Quebec City where they feast on a tortière. For the most part, however, the densely populated cities, our usual obsession, are omitted. What the author and illustrator do offer is a heartwarming, humorous and engaging story.Annie Magruder, the central character, journeys eastward to help her ailing sister, Elsie, who lives on the Atlantic coast. Promising Carson, her little dog, a “surprise” when they reach their destination, Annie packs the essentials: camping equipment, baloney sandwiches, dog food, and “Squeaky Chicken” (Squeaky Chicken is the dog’s toy; each time he chews it he gets “a brand new noise”). Carson is both lovable and credible. On the dry plains of Saskatchewan he eats a grasshopper “for dessert.” In the scorching heat of southern Manitoba he droops. In Niagara Falls where Annie buys a souvenir he “leaves a little souvenir of his own,” and when the tide goes out in the Bay of Fundy, he rolls all over the seabed, the “best mud ever.” Annie’s promised “surprise” for Carson is also credible. (No disclosure, here. Read the book.)Kass Reich’s illustrations are a perfect match for Bailey’s text. That the work concentrates on storyline is a gift to the intended audience. That its inherent geography lesson is subtle and evocative (as opposed to blatant and didactic) is totally refreshing. This is a must for Canadian home, school, and public libraries.Reviewer: Leslie AitkenHighly recommended 4 out of 4 starsLeslie Aitken’s long career in librarianship involved selection of children’s literature for school, public, special, and university collections. She is a former Curriculum Librarian at the University of Alberta.</jats:p
Hampton Carson to Viktor Hamburger, June 20, 1991
No full textCover letter for unattached enclosureCorrespondenc
The pulsation of Delta Scuti stars
No full textA theoretical study of the pulsation of Delta Scuti
stars is presented. A modified Henyey code is used to
produce a grid of evolutionary models of population I
composition, spanning the area of the Instability Strip on
and near the Main Sequence (mass range 1.4 to 3.0 Mₒ ; log T
> 3.8). Linear pulsation analysis of these models is
carried out, using both adiabatic (Sturm Sequence) and
non-adiabatic techniques. The results are found to agree
closely, and to be consistent with the observed properties
of real stars.
A number of the models are subjected to non-linear
analysis, using a modified Christy hydrodynamic code and the
Carson opacities. A series of models is given an initial
velocity kick of surface amplitude 10 km/s and profile
varying as the fifth power of the fractional radius. The
light curves of these models are found to be dominated by
the fundamental mode and first harmonic. The first five
eigenfunctions produced by the Sturm Sequence method are
used as initial velocity profiles for another series of
models, again with an initial kick of 10 km/s. The light
curves of these models are found to be dominated by the
frequency corresponding to the initially imposed mode of
pulsation. For both sets of models, the light amplitudes
are found to be larger than those of real stars. However,
the indication of a number of criteria is that the models
have not settled down to a final (smaller) amplitude.
The first three Sturm Sequence eigenfunctions are used
as initial velocity profiles for a smaller set of models
with an initial kick of surface amplitude 3 km/s. Again, a
final, settled amplitude is not achieved, but amplitudes are
closer to those of real stars. The shapes of the light and
velocity curves correspond closely to those of the same
models with the larger kick. It is suggested that the form
of the light curve may depend on the mode of pulsation. An
attempt to use the shape of the light curves of real
stars as a diagnostic for the mode of pulsation is
unsuccessful, due to lack of data in the literature.
A number of models depleted of helium are studied. One
set has (X,Y,Z) = (0.88,0.10,0.02). The opacity table for
this composition is obtained by interpolating between the
Carson tables C312 and C402. The second set has (X,Y,Z) =
(0.98,0.00,0.02), corresponding to table C402. Both sets of
models continue to pulsate, and it is concluded that the
region of hydrogen ionisation is an important source of
driving in these stars
Letter from [John Victor Carson], Dominguez Estate Company to Mr. L. C. Burr, November 8, 1937
No full textRefers to charges for repairing a property and rental payments
Letter from [John Victor Carson], Dominguez Estate Company to Mr. K. L. Schaap, December 21, 1939
No full textRequest for payment
Letter from [John Victor Carson], Dominguez Estate Company to Mr. K. L. Schaap, June 2,1 1939
No full textResponse to a request for oat hay
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