Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage

Theγ -ray binary system PSR B1259-63/LS 2883 passed through periastron in May of 2014 and was the focus of intensive multiwavelength campaigns. During the previous periastron, a large flare was detected at GeV energies 30 days after the 2010 periastron passage by Fermi-LAT. This event was re-detecte...

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Autores principales: Van Soelen, Brian, Väisänen, Petri, Odendaal, Alida, Sushch, Iuri, Klindt, Lizelke, Meintjes, Pieter
Formato: Objeto de conferencia
Lenguaje:Español
Publicado: 2015
Materias:
Ciencias Astronómicas
periastron
circumstellar disc
optical spectroscopy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/168116
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-168116
record_format dspace
spelling I19-R120-10915-1681162024-07-29T20:01:43Z http://sedici.unlp.edu.ar/handle/10915/168116 Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage Van Soelen, Brian Väisänen, Petri Odendaal, Alida Sushch, Iuri Klindt, Lizelke Meintjes, Pieter 2015-10 2016 2024-07-29T16:42:41Z es Ciencias Astronómicas periastron circumstellar disc optical spectroscopy Theγ -ray binary system PSR B1259-63/LS 2883 passed through periastron in May of 2014 and was the focus of intensive multiwavelength campaigns. During the previous periastron, a large flare was detected at GeV energies 30 days after the 2010 periastron passage by Fermi-LAT. This event was re-detected during 2014 at a similar orbital phase. In order to place better constraints on the behaviour of the circumstellar disc around periastron, we performed optical spectroscopy of the Hα and He i (λ6678) lines with the Southern African Large Telescope (SALT) from 33 days before until 78 days after the 2014 periastron. The Hα line remains single peaked through all observations, but with a noted asymmetry and variation in shape. The He i line remains double peaked and shows a variation in the relative peak heights. Both lines show an increase in the equivalent width which peaks after periastron. The line strengths before periastron are, however, weaker than were detected around the 2010 periastron, though are comparable after periastron. Facultad de Ciencias Astronómicas y Geofísicas Objeto de conferencia Objeto de conferencia 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 187-190
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Ciencias Astronómicas
periastron
circumstellar disc
optical spectroscopy
spellingShingle Ciencias Astronómicas
periastron
circumstellar disc
optical spectroscopy
Van Soelen, Brian
Väisänen, Petri
Odendaal, Alida
Sushch, Iuri
Klindt, Lizelke
Meintjes, Pieter
Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
topic_facet Ciencias Astronómicas
periastron
circumstellar disc
optical spectroscopy
description Theγ -ray binary system PSR B1259-63/LS 2883 passed through periastron in May of 2014 and was the focus of intensive multiwavelength campaigns. During the previous periastron, a large flare was detected at GeV energies 30 days after the 2010 periastron passage by Fermi-LAT. This event was re-detected during 2014 at a similar orbital phase. In order to place better constraints on the behaviour of the circumstellar disc around periastron, we performed optical spectroscopy of the Hα and He i (λ6678) lines with the Southern African Large Telescope (SALT) from 33 days before until 78 days after the 2014 periastron. The Hα line remains single peaked through all observations, but with a noted asymmetry and variation in shape. The He i line remains double peaked and shows a variation in the relative peak heights. Both lines show an increase in the equivalent width which peaks after periastron. The line strengths before periastron are, however, weaker than were detected around the 2010 periastron, though are comparable after periastron.
format Objeto de conferencia
Objeto de conferencia
author Van Soelen, Brian
Väisänen, Petri
Odendaal, Alida
Sushch, Iuri
Klindt, Lizelke
Meintjes, Pieter
author_facet Van Soelen, Brian
Väisänen, Petri
Odendaal, Alida
Sushch, Iuri
Klindt, Lizelke
Meintjes, Pieter
author_sort Van Soelen, Brian
title Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
title_short Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
title_full Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
title_fullStr Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
title_full_unstemmed Optical spectroscopic monitoring of the variation in the circumstellar disc in PSR B1259-63/LS 2883 during the 2014 periastron passage
title_sort optical spectroscopic monitoring of the variation in the circumstellar disc in psr b1259-63/ls 2883 during the 2014 periastron passage
publishDate 2015
url http://sedici.unlp.edu.ar/handle/10915/168116
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