The discovery of a shell-like event in the O-type star HD 120678

Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogra...

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Autores principales: Gamen, Roberto Claudio, Arias, Julia Inés, Barbá, Rodolfo Héctor, Morrell, Nidia Irene, Walborn, Nolan Revere, Sota, Alfredo, Maíz Apellániz, Jesús, Alfaro, Emilio J.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2012
Materias:
Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84002
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-84002
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
spellingShingle Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
Gamen, Roberto Claudio
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
The discovery of a shell-like event in the O-type star HD 120678
topic_facet Ciencias Astronómicas
Binaries: spectroscopic
Stars: early-type
Stars: emission-line, Be
Stars: individual: HD 120678
description Aims. We report the detection of a shell-like event in the Oe-type star HD 120678. Methods. HD 120678 has been intensively observed as part of a high-resolution spectroscopic monitoring program of southern Galactic O stars and Wolf-Rayet stars of the nitrogen sequence. Results. An optical spectrogram of HD 120678 obtained in June 2008 shows strong H and He i absorption lines instead of the double-peaked emission profiles observed both previously and subsequently, as well as a variety of previously undetected absorption features, mainly of O ii, Si iii and Fe iii. Photometric data reveal that the development of the absorption spectrum coincided with a remarkable dip in the V-band lightcurve. The "shell phase" of HD 120678 did not persist for very long: the V magnitude recovered its previous average value in fewer than 120 days, whereas H and He emission lines became detectable one year later. Similar spectral variations have been observed in a few Be stars, and they are usually interpreted as changes in the circumstellar disk.
format Articulo
Articulo
author Gamen, Roberto Claudio
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
author_facet Gamen, Roberto Claudio
Arias, Julia Inés
Barbá, Rodolfo Héctor
Morrell, Nidia Irene
Walborn, Nolan Revere
Sota, Alfredo
Maíz Apellániz, Jesús
Alfaro, Emilio J.
author_sort Gamen, Roberto Claudio
title The discovery of a shell-like event in the O-type star HD 120678
title_short The discovery of a shell-like event in the O-type star HD 120678
title_full The discovery of a shell-like event in the O-type star HD 120678
title_fullStr The discovery of a shell-like event in the O-type star HD 120678
title_full_unstemmed The discovery of a shell-like event in the O-type star HD 120678
title_sort discovery of a shell-like event in the o-type star hd 120678
publishDate 2012
url http://sedici.unlp.edu.ar/handle/10915/84002
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