OH observations of selected I.R.A.S. sources from southern hemisphere

In this paper, we report the results of observations of 53 objects taken from the IRAS point source catalog, with δ < -30°. These objects were studied in the 1612 MHz transition, as well as in the 1665 and 1667 MHz main lines of the OH radical. The observations were made at the Instituto Argentin...

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Detalles Bibliográficos
Autores principales: Silva, A.M., Azcárate, Ismael Norberto, Pöppel, Wolfgang G. L., Likkel, L.
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1990
Materias:
Astronomía
Galaxia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/142698
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-142698
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
spellingShingle Astronomía
Galaxia
Silva, A.M.
Azcárate, Ismael Norberto
Pöppel, Wolfgang G. L.
Likkel, L.
OH observations of selected I.R.A.S. sources from southern hemisphere
topic_facet Astronomía
Galaxia
description In this paper, we report the results of observations of 53 objects taken from the IRAS point source catalog, with δ < -30°. These objects were studied in the 1612 MHz transition, as well as in the 1665 and 1667 MHz main lines of the OH radical. The observations were made at the Instituto Argentino de Radioastronomia with a 30 m antenna. The selection criteria applied to the objects place them among the stars of evolved type with cool circumstellar envelopes. We found 12 objects with maser radiation in emission and/or absorption. Six of them seem to be new detections previously unreported. Ten objects show double peak profiles in the satellite line, as is typical for OH/IR stars with expansion envelopes. An analysis of the global IRAS colour properties of the 53 selected objects does not show any significant difference between the sources detected at OH and those not detected. Further analysis of the data allow us to conclude that the excitation of the maser mechanism is produced by infrared pumping due to circumstellar dust, as is usual in these types of sources.
format Articulo
Comunicacion
author Silva, A.M.
Azcárate, Ismael Norberto
Pöppel, Wolfgang G. L.
Likkel, L.
author_facet Silva, A.M.
Azcárate, Ismael Norberto
Pöppel, Wolfgang G. L.
Likkel, L.
author_sort Silva, A.M.
title OH observations of selected I.R.A.S. sources from southern hemisphere
title_short OH observations of selected I.R.A.S. sources from southern hemisphere
title_full OH observations of selected I.R.A.S. sources from southern hemisphere
title_fullStr OH observations of selected I.R.A.S. sources from southern hemisphere
title_full_unstemmed OH observations of selected I.R.A.S. sources from southern hemisphere
title_sort oh observations of selected i.r.a.s. sources from southern hemisphere
publishDate 1990
url http://sedici.unlp.edu.ar/handle/10915/142698
work_keys_str_mv AT silvaam ohobservationsofselectedirassourcesfromsouthernhemisphere
AT azcarateismaelnorberto ohobservationsofselectedirassourcesfromsouthernhemisphere
AT poppelwolfganggl ohobservationsofselectedirassourcesfromsouthernhemisphere
AT likkell ohobservationsofselectedirassourcesfromsouthernhemisphere
bdutipo_str Repositorios
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