Computerized Microphotometry of Stellar Spectrograms

1971 ◽  
Vol 11 ◽  
pp. 183-184
Author(s):  
David W. Latham
Keyword(s):  
Shock Tube ◽  
Harvard College ◽  
Interesting Topic ◽  
History Of ◽  
Harvard College Observatory

Let me begin my description of how we have been doing computerized microphotometry with a brief history of the hardware and its evolution. Then I’ll get on to the more interesting topic of what we do with the data after we get them into the computer.In 1966, the Shock Tube Laboratory at Harvard College Observatory took delivery of a David Mann microphotometer. Briefly, this $50 000 instrument can measure positions in an area 250 x 250 mm to an accuracy of about 1 μn. The limiting resolution of the measuring slit approaches 1 or 2 μm at the plate, and the drift in the photometer output is on the order of 1 per cent in 12 hours.

scholarly journals As mulheres do Harvard College Observatory: Henrietta Swan Leavitt - a mulher que descobriu como medir a distância das galáxias

2018 ◽  
Vol 18 ◽  
pp. 12
Author(s):  
Magali Conceição De Barros
Keyword(s):  
History Of Science ◽  
Technological Development ◽  
Harvard College ◽  
Astronomical Observations ◽  
Photographic Record ◽  
History Of ◽  
Harvard College Observatory ◽  
Relationship Of

ResumoNo final do século XIX e início do século XX, algumas mudanças ocorreram na área da astronomia, entre elas, o desenvolvimento técnico/tecnológico, o aparecimento de novos observatórios e juntamente com eles o aperfeiçoamento dos telescópios e a introdução da fotografia na astronomia, que possibilitou o registro das observações que antes eram feitas através de desenhos. Outra mudança que ocorreu foi a entrada de mulheres na astronomia, o registro fotográfico de observações astronômicas permitiu, que em um ambiente masculino, mulheres pudessem adentrar e fazer suas pesquisas, pois embora não lhes fosse permitido fazer observações noturnas elas poderiam utilizar as chapas fotográficas. Para exemplificar a importância do trabalho feminino nesta época, vamos mostrar a pesquisa e de Henrietta Swan Leavitt que descobriu a Relação Período-Luminosidade de Estrelas Variáveis.Palavras-chave: História da Ciência; Mulheres  na Astronomia; Régua Cósmica; Henrietta Swan Leavitt; Relação Período-luminosidade.AbstractIn the late 19th  and early 20th, some changes occurred in the area of astronomy, among them technical / technological development, the appearance of new observatories and together with them the improvement of telescopes and the introduction of photography in astronomy that made possible the registration from earlier observations made through drawings. Another change that occurred was the entry of women into astronomy, the photographic record of astronomical observations allowed that in a masculine environment women could enter and do their research, because although they were not allowed to make nocturnal observations they could use photographic plates. To exemplify the importance of female work at this time, let's show the research and from Henrietta Swan Leavitt who discovered the Period-Luminosity Relationship of Variable Stars.Keywords: History of Science; Women in Astronomy; Cosmic Ruler; Henrietta Swan Leavitt; Period-luminosity relationship.

Some comments about observations and image processing of comet 29P/Schwassmann-Wachmann 1

1999 ◽  
Vol 173 ◽  
pp. 243-248
Author(s):  
D. Kubáček ◽  
A. Galád ◽  
A. Pravda
Keyword(s):  
Image Processing ◽  
Large Scale ◽  
Harvard College ◽  
Oak Ridge ◽  
Large Scale Structures ◽  
Short Period Comet ◽  
Short Period ◽  
Scale Structures ◽  
Harvard College Observatory ◽  
Period Comet

AbstractUnusual short-period comet 29P/Schwassmann-Wachmann 1 inspired many observers to explain its unpredictable outbursts. In this paper large scale structures and features from the inner part of the coma in time periods around outbursts are studied. CCD images were taken at Whipple Observatory, Mt. Hopkins, in 1989 and at Astronomical Observatory, Modra, from 1995 to 1998. Photographic plates of the comet were taken at Harvard College Observatory, Oak Ridge, from 1974 to 1982. The latter were digitized at first to apply the same techniques of image processing for optimizing the visibility of features in the coma during outbursts. Outbursts and coma structures show various shapes.

scholarly journals Harvard college observatory circular no. 27

1898 ◽  
Vol 146 (9) ◽  
pp. 139-142
Author(s):  
Edward C. Pickering
Keyword(s):  
Harvard College ◽  
Harvard College Observatory

Modern surgery and its relation to practical medicine

1903 ◽  
Vol 3 (7-8) ◽  
pp. 380-391
Author(s):  
V. L. Borman
Keyword(s):  
Internal Medicine ◽  
Practical Medicine ◽  
Interesting Topic ◽  
Introductory Lecture ◽  
History Of ◽  
The Subject ◽  
Relationship Of ◽  
The Relationship

It is accepted and consecrated by custom that every university lecturer who joins the honorary faculty should begin to read his or her lectures with an introductory speech on the subject or the history of the subject to be taught in the following presentation, or the lecturer should develop his or her views before the students on the subject that is relevant to the course; finally, it may serve as a no less interesting topic for the introductory lecture and the outline of the instructional plan with the motivation of its individual points.I currently intend to develop my views on the relationship of surgery to certain areas of internal medicine and talk about the importance of surgical diagnostics for the practitioner.

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