Zobrazeno 1 - 10
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pro vyhledávání: '"Siobahn M. Morgan"'
Autor:
Siobahn M. Morgan
Publikováno v:
International Astronomical Union Colloquium. 193:176-179
The status of the WWW-based Fourier Coefficient web site is presented. Currently the database has coefficients for not only galactic field variables, but also those found in globular clusters and other galaxies, including the Magellanic Clouds. The d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b248497b51cb2f6a5c962b275414b51
https://doi.org/10.1017/s0252921100010575
https://doi.org/10.1017/s0252921100010575
Autor:
Siobahn M. Morgan
Publikováno v:
Publications of the Astronomical Society of the Pacific. 115:1250-1255
Fourier coefficients are a valuable tool in the study of a wide variety of pulsating stars. In the case of RR Lyrae stars they, can be used to estimate various physical parameters, such as mass, luminosity, metallicity, and effective temperature. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d068d76a225cc752c7f3c3a9f18d53d
https://doi.org/10.1086/377372
https://doi.org/10.1086/377372
Publikováno v:
The Astronomical Journal. 120:990-997
Accurate mass determinations for Cepheids may be used to determine the degree of excess mixing in the interiors of their main-sequence progenitors: the larger the excess mixing, the larger the luminosity of the Cepheid of a given mass, or the smaller
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::650de9148af9f984a53a9f4f8a38a41c
https://doi.org/10.1086/301496
https://doi.org/10.1086/301496
Autor:
J. R. Percy, L. Szabados, K. Oláh, N.N. Samus, Luis A. Balona, D.W. Kurtz, Nancy Remage Evans, T.G. Barnes, Amelia Wehlau, M. W. Feast, D.E. Winget, Siobahn M. Morgan, C.J. Butler, L. Hartmann
Publikováno v:
Transactions of the International Astronomical Union. 22:243-276
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e35983584f0cfceeb85ace14f3850f1e
https://doi.org/10.1017/s0251107x00008051
https://doi.org/10.1017/s0251107x00008051
Autor:
Siobahn M. Morgan
Publikováno v:
Proceedings of the International Astronomical Union. 9:461-462
The relationship derived by Morganet al. (2007) for type-c RR Lyrae variables (RRc) between values of [Fe/H] – φ31–Phas been revised and expanded. New relationships are based upon Fourier coefficients of 163 RRc variables in 19 Galactic globular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::040c8443efe2a3bdf7f2559dbaa10784
https://doi.org/10.1017/s1743921313015056
https://doi.org/10.1017/s1743921313015056
Autor:
Siobahn M. Morgan, Douglas L. Welch
The discovery of a large number of beat Cepheids in the Large Magellanic Cloud in the MACHO survey, provides an opportunity to compare the characteristics of such Cepheids over a range of metallicities. We produced a large grid of linear nonadiabatic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4408860b16d38262c76a530e1f46a30a
Autor:
C. J. Butler, Nancy Remage Evans, D. E. Winget, Thomas G. Barnes, L. Hartmann, D. W. Kurtz, Siobahn M. Morgan, Luis A. Balona, Amelia Wehlau, László Szabados, John R. Percy, M. W. Wehlau, K. Oláh
Publikováno v:
Reports on Astronomy ISBN: 9789401044813
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bcef2663862c28793b5f14a07ace0ddd
https://doi.org/10.1007/978-94-011-1100-3_19
https://doi.org/10.1007/978-94-011-1100-3_19
Publikováno v:
International Astronomical Union Colloquium. 155:192-193
Both radial and low degree and order g-mode nonradial pulsations are predicted for luminous blue variables that occur in the blue supergiant region of the Hertzsprung-Russell diagram. It is found that the radial strange modes have very large growth r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9bb964c3f89e3bec01be6df8616babd9
https://doi.org/10.1017/s0252921100036952
https://doi.org/10.1017/s0252921100036952
Autor:
Siobahn M. Morgan
Publikováno v:
International Astronomical Union Colloquium. 139:307-307
For the most part it had been assumed that the red and the blue edges of the Cepheid Instability region were parallel. However, previous work by Pel and Lub (1978) and recent work by Fernie (1990) seems to reveal a rather interesting structure to the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4ea2ed32f0a1db7db0bcafcf40f4c8bb
https://doi.org/10.1017/s0252921100117683
https://doi.org/10.1017/s0252921100117683
Autor:
Siobahn M. Morgan, Arthur N. Cox
Publikováno v:
International Astronomical Union Colloquium. 139:308-308
The low amplitude radially pulsating classical Cepheid Polaris (α UMi) has well observed decreasing radial velocity and light amplitudes and an increasing period. Recent work indicates that Polaris may stop pulsating by 1995 (Dinshaw et al, 1989), w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5301fe9b0a6c03eef63746232cfa9dc4
https://doi.org/10.1017/s0252921100117695
https://doi.org/10.1017/s0252921100117695