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  • 1
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    Atoms in astronomy (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Aspects of electromagnetic radiation and atomic physics needed for an understanding of astronomical applications are explored. Although intended primarily for teachers, this brochure is written so that it can be distributed to students if desired. The first section, Basic Topics, is suitable for a ninth-grade general science class; the style is simple and repetitive, and no mathematics or physics background is required. The second section, Intermediate and Advanced Topics, requires a knowledge of the material in the first section and assumes a generally higher level of achievement and motivation on the part of the student. These latter topics might fit well into junior-level physics, chemistry, or earth-science courses. Also included are a glossary, a list of references and teaching aids, class exercises, and a question and answer section.
    Keywords: ASTRONOMY
    Type: NASA-EP-128
    Format: application/pdf
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  • 2
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    The supernova: A stellar spectacle (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: The life of a star, the supernova, related objects and their importance in astronomy and science in general are discussed. Written primarily for science teachers of secondary school chemistry, physics, and earth sciences, the booklet contains a glossary, reference sources, suggested topics for discussion, and projects for individual or group assignment.
    Keywords: ASTRONOMY
    Type: NASA-EP-126
    Format: application/pdf
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  • 3
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    The space telescope (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: Papers concerning the development of the Space Telescope which were presented at the Twenty-first Annual Meeting of the American Astronautical Society in August, 1975 are included. Mission planning, telescope performance, optical detectors, mirror construction, pointing and control systems, data management, and maintenance of the telescope are discussed.
    Keywords: ASTRONOMY
    Type: NASA-SP-392 , Ann. Meeting of Am. Astronautical Soc.; Aug 26, 1975 - Aug 28, 1975; Denver, CO; United States
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  • 4
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    Extragalactic astronomy: The universe beyond our galaxy (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: This single-topic brochure is for high school physical science teachers to use in introducing students to extragalactic astronomy. The material is presented in three parts: the fundamental content of extragalactic astronomy; modern discoveries delineated in greater detail; and a summary of the earlier discussions within the structure of the Big-Bang Theory of evolution. Each of the three sections is followed by student exercises (activities, laboratory projects, and questions-and-answers). The unit close with a glossary which explains unfamilar terms used in the text and a collection of teacher aids (literature references and audiovisual materials for utilization in further study).
    Keywords: ASTRONOMY
    Type: NASA-EP-129
    Format: application/pdf
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  • 5
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    The positions and proper motions of HZ Herculis and 12 neighboring stars (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The positions and proper motions of HZ Her, the optical counterpart of the X-ray source Her X-1, and 12 field stars are determined in the system of the FK4. The proper motion of HZ Her is consistent with that expected for an object with a relatively low peculiar velocity located at the approximate 3-kpc distance estimated for Her X-1.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal; 204; Mar. 1
    Format: text
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  • 6
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    The evolution of rotating stars. 1: Method and exploratory calculations for a 7 solar mass star (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: A method was developed which allows us to study the evolution of rotating stars beyond the main sequence stage. Four different cases of redistribution of angular momentum in an evolving star are considered. Evolutionary sequences for a 7 solar mass star, rotating according to these different cases, were computed from the ZAMS to the double shell source stage. Each sequence was begun with a (typical) equatorial velocity of 210 km/sec. On the main sequence, the effects of rotation are of minor importance. As the core contracts during later stages, important effects arise in all physically plausible cases. The outer regions of the cores approach critical velocities and develop unstable angular velocity distributions. The effects of these instabilities should significantly alter the subsequent evolution.
    Keywords: ASTRONOMY
    Type: NASA-TM-X-71050 , X-671-76-9
    Format: application/pdf
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  • 7
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    Ultraviolet stellar spectra obtained on Skylab (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A 15-cm aperture f/3 Ritchey-Chretien telescope equipped with a 4 deg calcium fluoride prism was employed in taking objective prism spectra from 1300 to 5000 A in 188 stars, in the three Skylab missions. Spectra of 2 A resolution at 1400 A and 10 A at 2000 A, extending to B0 stars such that V equals 6.5, were taken of 400 stars in the neighborhood of 1500 A. Stellar temperature and luminosity variations are revealed in resonance lines of C IV and Si IV. Profiles of P Cygni type show up in the spectra of all stars with absolute bolometric magnitudes brighter than minus 8.4, implying appreciable outflow of mass. Spectra with emission lines shortward of 2000 A were obtained for 12 WR stars, and spectra of some companion stars dominating the UV spectra are reported.
    Keywords: ASTRONOMY
    Type: Open Meetings of Working Groups on Physical Sciences; May 29, 1975 - Jun 07, 1975; Varna; Bulgaria|Symposium and Workshop on Results from Coordinated Upper Atmosphere Measurement Programs; May 29, 1975 - May 31, 1975
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  • 8
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    Ultraviolet observations of Be stars /Review paper/ (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: In the last decade twelve major space experiments have observed Be stars in the UV region of the spectrum. The characteristics of the experiments are listed in a table. The studies were conducted with the aid of two rockets, five astronomical satellites, three manned satellites, and one planetary probe. Another table shows the name and the spectral type of the bright Be stars observed in the UV. Approaches concerning a system for ultraviolet spectral classification are discussed. Attention is also given to aspects of mass loss, the effects of rapid rotation, and the properties of the shell.
    Keywords: ASTRONOMY
    Type: Merrill-McLaughlin Memorial Symposium; Sep 15, 1975 - Sep 18, 1975; Bass River, MA
    Format: text
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  • 9
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    The ultraviolet variations of iota Cas (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The Ap variable star iota Cas was observed with the photometers on OAO-2 covering the spectral range 1430-4250 A. The ultraviolet light curves show a double wave with primary minimum and maximum at phase ? 0.00 and 0.35, respectively. Secondary minimum light is at phase ? 0.65 with secondary maximum at phase ? 0.85. The light curves longward of 3150 A vary in opposition to those shortward of this 'null region'. Ground-based coude spectra show that the Fe II and Cr II line strengths have a double-wave variation such that maximum strength occurs at minimum ultraviolet light. We suggest that the strong ultraviolet opacities due to photoionization and line blanketing by these metals may cause the observed photometric variations. We have also constructed an oblique-rotator model which shows iron and chromium lying in a great circle band rather than in circular spots.
    Keywords: ASTRONOMY
    Type: Colloquium on Physics of Ap-stars; Sep 08, 1975 - Sep 11, 1975; Vienna; Austria
    Format: text
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  • 10
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    Si II lines in the shell of Zeta Tau (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Non-LTE strengths of Si II lines were computed in an effort to reproduce the observed strengths of Si II lines in the shell spectrum of Zeta Tau. This effort was unsuccessful, probably because it assumed that the shell could be represented by a finite, plane-parallel slab. The main conclusion of this study, then, is that in order to understand the shell spectra of Be stars, a more realistic geometry must be assumed, in which the shell is represented by a thick disk.
    Keywords: ASTRONOMY
    Type: Merrill-McLaughlin Memorial Symposium; Sep 15, 1975 - Sep 18, 1975; Bass River, MA
    Format: text
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