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The enigmatic binary system HD 5980
Indexado
WoS WOS:000474894100055
Scopus SCOPUS_ID:85072282091
DOI 10.1093/MNRAS/STZ808
Año 2019
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



The Small Magellanic Cloud multiple system HD5980 contains a luminous blue variable (LBV) that underwent a major eruption in 1994, and whose current spectrum is that of a hydrogen-rich Wolf-Rayet (WR) star. Since the eruption, the wind mass-loss rate has been declining while wind speeds have been steadily increasing. Observations obtained in 2014 when Star A (the LBV) eclipses Star B indicate that the fitted mass-loss rate and luminosity have reached the lowest values ever determined for such spectra:. M = 4.5 x 10(-5) M-circle dot yr(-1), L = 1.7 x 10(6) L-circle dot. In addition, the radius of the LBV's continuum-emitting region is similar to that derived from the eclipse light curves of the late 1970s. Hence, it appears to have attained a similar 'low' state to that of the late 1970s. While a good fit to the emission spectrum is obtained using a CMFGEN model, there are discrepancies in the UV. In particular, the extent of the observed absorption profiles is similar to 1000 km s(-1) greater than predicted by the emission-line intensities. Further, HST UV observations obtained in 2016, when Star A is eclipsed by Star B, show unusual P Cygni profiles that are not easily explained. Surprisingly the 2016 emissionline spectrum is similar to that at the opposite eclipse obtained in 2014. The complex UV profiles are likely to arise as a consequence of the dynamics of the wind-wind collision and radiative braking, both of which will cause significant departures from spherical symmetry, and have a strong orbital phase dependence. However, other scenarios, such as intrinsically aspherical winds, cannot be ruled out.

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Disciplinas de Investigación



WOS
Astronomy & Astrophysics
Scopus
Sin Disciplinas
SciELO
Sin Disciplinas

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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Hillier, D. John Hombre Univ Pittsburgh - Estados Unidos
University of Pittsburgh - Estados Unidos
2 KOENIGSBERGER-HOROWITZ, GLORIA SUZANNE Mujer Univ Nacl Autonoma Mexico - México
Universidad Nacional Autónoma de México - México
Universidad Nacional Autónoma de México Campus Morelos - México
3 Naze, Y. Mujer Univ Liege - Bélgica
Universite de Liege - Bélgica
4 MORRELL, NIDIA IRENE Mujer Observatorio Las Campanas - Chile
Las Campanas Observatory - Chile
Carnegie Observ - Chile
5 BARBA-SUAREZ, RODOLFO HECTOR Hombre Universidad de la Serena - Chile
6 Gamen, Roberto Hombre UNIV NACL LA PLATA - Argentina
UNLP - Argentina
Instituto de Astrofísica de La Plata (CONICET- Universidad Nacional de La Plata) - Argentina
Instituto de Astrofisica de La Plata - Argentina

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Financiamiento



Fuente
Consejo Nacional de Investigaciones Científicas y Técnicas
Universidad Nacional de La Plata
CONACYT
Consejo Nacional de Ciencia y Tecnología
DIDULS
Universidad Nacional Autónoma de México
Universidad de La Serena
NASA
DGAPA
National Aeronautics and Space Administration
Space Telescope Science Institute
Fonds De La Recherche Scientifique - FNRS
Association of Universities for Research in Astronomy, Inc.
NASA Office of Space Science
Association of Universities for Research in Astronomy, Inc., under NASA
Fonds National de la Recherche Scientifique (Belgium)
PRODEX XMas contract
DIDULS Project (Universidad de La Serena, Chile)
DGAPA/UNAM
Consejo Nacional de Ciencia y Tecnología, Paraguay
Institut national de la recherche scientifique
PRODEX

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Agradecimientos



Agradecimiento
Data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Support for MAST for nonHST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Support to DJH for this work was provided by NASA through grant numbers HST-GO-13373.001-A and HST-GO-14476.002-A from the Space Telescope Science Institute, which is operated byAURA, Inc., under NASA contract NAS 5-26555. GK acknowledges support from CONACYT 252499 and DGAPA/UNAM IN103619. YN acknowledges support from the Fonds National de la Recherche Scientifique (Belgium), and the PRODEX XMas contract. RHB acknowledges support from DIDULS Project PR18143 (Universidad de La Serena, Chile). We would like to express our gratitude to the referee, Ian Howarth, for a thorough and comprehensive review of our paper. Any mistakes remaining in the paper are the sole responsibility of the authors.
1The STIS/MAMA spectrum of 2014 was obtained in two successive acquisitions and the second one is at slightly lower flux levels than the first one. According to the modified T0, the corresponding orbital phases would have been 0.993 and 0.997, respectively, consistent with a deeper eclipse during the second segment. 2http://www.stsci.edu/hst/stis/documents/handbooks/currentIHB/stis ihb.p df. 3Data sets O55Q, O6CD, OB2N. 4STScI MAST: Mikulski Archive for Space Telescopes. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. The data described here may be obtained from https://dx.doi.org/10.17909/T9RP4V.

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