Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period

Context. The periodicity of 5.5 years for some observational events occurring in η Carinae manifests itself across a large wavelength range and has been associated with its binary nature. These events are supposed to occur when the binary components are close to periastron. To detect the previous pe...

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Autores principales: Fernández Lajús, Eduardo, Fariña, Cecilia, Torres, Andrea Fabiana, Schwartz, Martín Alejandro, Salerno, Nicolás, Calderón, Juan Pablo, Essen, Carolina von, Calcaferro, Leila Magdalena, Giudici Michilini, Federico Nicolás, Llinares, C., Niemelä, Virpi Sinikka
Formato: Articulo
Lenguaje:Inglés
Publicado: 2009
Materias:
Ciencias Astronómicas
Stars: circumstellar matter
Stars: individual: η carinae
Stars: variables: General
Techniques: photometric
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/82788
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-82788
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
Stars: circumstellar matter
Stars: individual: η carinae
Stars: variables: General
Techniques: photometric
spellingShingle Ciencias Astronómicas
Stars: circumstellar matter
Stars: individual: η carinae
Stars: variables: General
Techniques: photometric
Fernández Lajús, Eduardo
Fariña, Cecilia
Torres, Andrea Fabiana
Schwartz, Martín Alejandro
Salerno, Nicolás
Calderón, Juan Pablo
Essen, Carolina von
Calcaferro, Leila Magdalena
Giudici Michilini, Federico Nicolás
Llinares, C.
Niemelä, Virpi Sinikka
Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
topic_facet Ciencias Astronómicas
Stars: circumstellar matter
Stars: individual: η carinae
Stars: variables: General
Techniques: photometric
description Context. The periodicity of 5.5 years for some observational events occurring in η Carinae manifests itself across a large wavelength range and has been associated with its binary nature. These events are supposed to occur when the binary components are close to periastron. To detect the previous periastron passage of η Car in 2003, we started an intensive, ground-based, optical, photometric observing campaign. Aims. We continued observing the object to monitor its photometric behavior and variability across the entire orbital cycle. Methods. Our observation program consisted of daily differential photometry from CCD images, which were acquired using a 0.8 m telescope and a standard BVRI filter set at La Plata Observatory. The photometry includes the central object and the surrounding Homunculus nebula. Results. We present up-to-date results of our observing program, including homogeneous photometric data collected between 2003 and 2008. Our observations demonstrated that η Car has continued increasing in brightness at a constant rate since 1998. In 2006, it reached its brightest magnitude (V - 4.7) since about 1860. The object then suddenly reverted its brightening trend, fading to V = 5.0 at the beginning of 2007, and has maintained a quite steady state since then. We continue the photometric monitoring of η Car in anticipation of the next "periastron passage", predicted to occur at the beginning of 2009.
format Articulo
Articulo
author Fernández Lajús, Eduardo
Fariña, Cecilia
Torres, Andrea Fabiana
Schwartz, Martín Alejandro
Salerno, Nicolás
Calderón, Juan Pablo
Essen, Carolina von
Calcaferro, Leila Magdalena
Giudici Michilini, Federico Nicolás
Llinares, C.
Niemelä, Virpi Sinikka
author_facet Fernández Lajús, Eduardo
Fariña, Cecilia
Torres, Andrea Fabiana
Schwartz, Martín Alejandro
Salerno, Nicolás
Calderón, Juan Pablo
Essen, Carolina von
Calcaferro, Leila Magdalena
Giudici Michilini, Federico Nicolás
Llinares, C.
Niemelä, Virpi Sinikka
author_sort Fernández Lajús, Eduardo
title Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
title_short Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
title_full Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
title_fullStr Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
title_full_unstemmed Long-term optical monitoring of η Carinae: Multiband light curves for a complete orbital period
title_sort long-term optical monitoring of η carinae: multiband light curves for a complete orbital period
publishDate 2009
url http://sedici.unlp.edu.ar/handle/10915/82788
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