OH emission from circumstellar envelopes of post-agb stars

We searched for OH radiation in a sample of 53 objects selected from the IRAS PSC. According to their color properties the sources have the cool envelopes (Tenv 150-300K) of objects in evolution between OH-IR stars and planetary nebulae (PN). The sources were chosen from within the southern sky with...

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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: 1992
Materias:
Astronomía
Galaxia
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/143647
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-143647
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 emission from circumstellar envelopes of post-agb stars
topic_facet Astronomía
Galaxia
description We searched for OH radiation in a sample of 53 objects selected from the IRAS PSC. According to their color properties the sources have the cool envelopes (Tenv 150-300K) of objects in evolution between OH-IR stars and planetary nebulae (PN). The sources were chosen from within the southern sky with declinations δ < -30°. We sought the OH radical at the frequency of 1612, 1665, and 1667 MHz with 30m-antenna of the Instituto Argentino de Radioastronomía (IAR). We found OH radiation in emission and/or absorption towards thirteen of the sources, among which are two known bipolar nebulae. There is evidence of an uneven distribution of the matter surrounding the star for Roberts 22 (IRAS 10197-5750). Its OH variability was studied. For the objects detected in emission , we present evidence for infrared radiative pumping of the 1612 MHz maser line. The importance of the mass loss process for understanding the evolutionary stage of the objects and its influence on OH line is discussed.
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 emission from circumstellar envelopes of post-agb stars
title_short OH emission from circumstellar envelopes of post-agb stars
title_full OH emission from circumstellar envelopes of post-agb stars
title_fullStr OH emission from circumstellar envelopes of post-agb stars
title_full_unstemmed OH emission from circumstellar envelopes of post-agb stars
title_sort oh emission from circumstellar envelopes of post-agb stars
publishDate 1992
url http://sedici.unlp.edu.ar/handle/10915/143647
work_keys_str_mv AT silvaam ohemissionfromcircumstellarenvelopesofpostagbstars
AT azcarateismaelnorberto ohemissionfromcircumstellarenvelopesofpostagbstars
AT poppelwolfganggl ohemissionfromcircumstellarenvelopesofpostagbstars
AT likkell ohemissionfromcircumstellarenvelopesofpostagbstars
bdutipo_str Repositorios
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