Note on the Ca II Emission in Cepheids

It has been shown by O.Wilson and V. Bappu that a strong correlation exists between the absolute magnitude of late type stars and the strength of their Call emissions. We have felt that this relation could also hold for Cepheid variables. from our plate material of Cepheids, taken with the 60"...

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Detalles Bibliográficos
Autores principales: Jaschek, Mercedes, Jaschek, Carlos, Feinstein, Alejandro
Formato: Articulo Comunicacion
Lenguaje:Inglés
Publicado: 1960
Materias:
Ciencias Astronómicas
Galaxias
Ca ll emissions
Cepheids
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/74430
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-74430
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spelling I19-R120-10915-744302024-04-29T17:28:22Z http://sedici.unlp.edu.ar/handle/10915/74430 Note on the Ca II Emission in Cepheids Jaschek, Mercedes Jaschek, Carlos Feinstein, Alejandro 1960 2019-04-24T11:54:11Z en Ciencias Astronómicas Galaxias Ca ll emissions Cepheids It has been shown by O.Wilson and V. Bappu that a strong correlation exists between the absolute magnitude of late type stars and the strength of their Call emissions. We have felt that this relation could also hold for Cepheid variables. from our plate material of Cepheids, taken with the 60" reflector of the Bosque Alegre station of the Cordoba Observatory (dispersion 42 A/mm) we have selected all plates showing double emission in the H and/or K lines. The position of each emission wing was measured, and the difference between both measurements (in Km/sec) was taken as the width "W" of the emission. It is well known that the emission features in Cepheids are usually stronger in the H than in the K line; for this reason the results are based on the emissions in H alone. Asociación Argentina de Astronomía Articulo Comunicacion http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Galaxias
Ca ll emissions
Cepheids
spellingShingle Ciencias Astronómicas
Galaxias
Ca ll emissions
Cepheids
Jaschek, Mercedes
Jaschek, Carlos
Feinstein, Alejandro
Note on the Ca II Emission in Cepheids
topic_facet Ciencias Astronómicas
Galaxias
Ca ll emissions
Cepheids
description It has been shown by O.Wilson and V. Bappu that a strong correlation exists between the absolute magnitude of late type stars and the strength of their Call emissions. We have felt that this relation could also hold for Cepheid variables. from our plate material of Cepheids, taken with the 60" reflector of the Bosque Alegre station of the Cordoba Observatory (dispersion 42 A/mm) we have selected all plates showing double emission in the H and/or K lines. The position of each emission wing was measured, and the difference between both measurements (in Km/sec) was taken as the width "W" of the emission. It is well known that the emission features in Cepheids are usually stronger in the H than in the K line; for this reason the results are based on the emissions in H alone.
format Articulo
Comunicacion
author Jaschek, Mercedes
Jaschek, Carlos
Feinstein, Alejandro
author_facet Jaschek, Mercedes
Jaschek, Carlos
Feinstein, Alejandro
author_sort Jaschek, Mercedes
title Note on the Ca II Emission in Cepheids
title_short Note on the Ca II Emission in Cepheids
title_full Note on the Ca II Emission in Cepheids
title_fullStr Note on the Ca II Emission in Cepheids
title_full_unstemmed Note on the Ca II Emission in Cepheids
title_sort note on the ca ii emission in cepheids
publishDate 1960
url http://sedici.unlp.edu.ar/handle/10915/74430
work_keys_str_mv AT jaschekmercedes noteonthecaiiemissionincepheids
AT jaschekcarlos noteonthecaiiemissionincepheids
AT feinsteinalejandro noteonthecaiiemissionincepheids
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