Radius Variation and Population Type of Cepheid Variables
نویسندگان
چکیده
منابع مشابه
: metadiscourse in introduction sections of applied linguistics and physics research articles: exploring variation in frequency and type
abstract in written mode of language, metadiscourse markers are used commonly to help writers in general and academic writers in particular to produce coherent and professional texts. the purpose of the present study was to compare introduction sections of applied linguistics and physics articles regarding their use of interactive and interactional metadiscourse markers based on the model pro...
15 صفحه اولthe investigation of the relationship between type a and type b personalities and quality of translation
چکیده ندارد.
Discovery of Cepheid Variables Inthe
We present the results of a survey for Cepheid variables in the Virgo Cluster spiral NGC 4571 using the High-Resolution Camera (HRCam) on the Canada-France-Hawaii Telescope. Our 13 epochs, taken over a span of 800 days, have typical FWHM of 0.50 arcsec enabling 10% photometry to R 24.5 mag. The application of point-spread tting photometry and both an automated and visual search for variability ...
متن کاملPeriod, Color, and Luminosity for Cepheid Variables
Payne-Gaposehkin, Cecilia H. Period, Color, and Luminosity for Cepheid Variables. Smithsonian Contributions to Astrophysics, number 17, 10 pages, 8 tables, 1974.—The Cepheids of the Galaxy and the Magellanic Clouds display a gradation in properties, but when amplitude as well as period is taken into account, their intrinsic colors are sensibly similar. The periodluminosity relations in the thre...
متن کاملSpectroscopic Determination of Radius Changes of Cepheid Variable Stars
We introduce a simple method for determining pulsation velocities of Cepheid variables; namely, the matching of observed spectral line profiles in both shape and absolute position with model profiles. This approach avoids the ambiguous meaning of radial velocity for asymmetric lines, and it avoids the awkward projection factor (the “p” factor) used to expand radial velocities to pulsation veloc...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1957
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/117.1.85