|Author||Chambliss, C. R.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||Physics (Astrophysics & Cosmology)-Stars ♦ Physics Research-Astrophysics & Cosmology-Stars ♦ BINARY STARS- ECLIPSE ♦ COLOR ♦ GIANT STARS ♦ MAIN SEQUENCE STARS ♦ ORBITS ♦ VARIATIONS ♦ VISIBLE RADIATION|
|Abstract||The semidetached eclipsing binary system RZ Cas was observed at Kutztown State College Observatory and at Kitt Peak National Observatory on 25 nights from January 1973 to January 1975. Approximately 600 observations each were obtained in yellow, blue, and ultraviolet. RZ Cas has long been known to have a variable period, and a new ephemeris based on the author's observations is given. RZ Cas consists of an A2V primary component paired with a subgiant component of spectral type about G5 IV. Solutions for its orbital elements were carried out using three different procedures; the Russell-Merrill method, the Kopal-Jurkevich iterative method, and the Wood triaxial ellipsoid model. For the first two procedures, rectified observations were used. The orbital elements obtained with these methods are in excellent agreement with each other but the temperature of the subgiant component derived from an analysis of the yellow light curve is about 500$sup 0$K lower than that obtained from the ultraviolet light curve. The Wood model produces orbital elements which differ significantly from those of the spherical model in some cases. A higher temperature is indicated for the subgiant component, but as before, a difference of about 500$sup 0$K is indicated between the yellow and ultraviolet light curves with the temperature derived from the blue light curve falling between them. Using the available spectroscopic data for RZ Cas, the masses of the components are estimated as 1.75 M/sub solar mass/ and 0.61 M/sub solar mass/ and their respective radii as 1.45 R/sub solar mass/ and 1.83 R/sub solar mass/. Both the mass and radius of the A2 V component are less than one would expect for a star of this type. RZ Cas is compared with the eclipsing binary V505 Sgr, a system whose primary is also an A 2V star, but of more normal size and mass. The visual absolute magnitude of RZ Cas is estimated as +2.0 and its distances as 70 parsecs. (auth)|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Publ. Astron. Soc. Pac.|
|Organization||Kutztown State Coll., PA|
National Digital Library of India (NDLI) is a virtual repository of learning resources which is not just a repository with search/browse facilities but provides a host of services for the learner community. It is sponsored and mentored by Ministry of Education, Government of India, through its National Mission on Education through Information and Communication Technology (NMEICT). Filtered and federated searching is employed to facilitate focused searching so that learners can find the right resource with least effort and in minimum time. NDLI provides user group-specific services such as Examination Preparatory for School and College students and job aspirants. Services for Researchers and general learners are also provided. NDLI is designed to hold content of any language and provides interface support for 10 most widely used Indian languages. It is built to provide support for all academic levels including researchers and life-long learners, all disciplines, all popular forms of access devices and differently-abled learners. It is designed to enable people to learn and prepare from best practices from all over the world and to facilitate researchers to perform inter-linked exploration from multiple sources. It is developed, operated and maintained from Indian Institute of Technology Kharagpur.
NDLI is a conglomeration of freely available or institutionally contributed or donated or publisher managed contents. Almost all these contents are hosted and accessed from respective sources. The responsibility for authenticity, relevance, completeness, accuracy, reliability and suitability of these contents rests with the respective organization and NDLI has no responsibility or liability for these. Every effort is made to keep the NDLI portal up and running smoothly unless there are some unavoidable technical issues.
Ministry of Education, through its National Mission on Education through Information and Communication Technology (NMEICT), has sponsored and funded the National Digital Library of India (NDLI) project.
For any issue or feedback, please write to firstname.lastname@example.org