Optical identification of the transient supersoft X-ray source RX J0527.8-6954, in the LMC

Autor(es)

Oliveira, A. S. ^[1] ; Steiner, J. E. ^[2] ; Ricci, T. V. ^[2] ; Menezes, R. B. ^[2] ; Borges, B. W. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Vale Paraiba, IP&D, BR-12244000 Sao Jose Dos Campos, SP - Brazil

^[2] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Astronomy & Astrophysics; v. 517, JUL 2010.
• Citações Web of Science: 1

Resumo

Context. Close binary supersoft X-ray sources (CBSS) are binary systems that contain a white dwarf with stable nuclear burning on its surface. These sources, first discovered in the Magellanic Clouds, have high accretion rates and near-Eddington luminosities (10(37)-10(38) erg s(-1)) with high temperatures (T = 2-7 x 10(5) K). Aims. The total number of known objects in the MC is still small and, in our galaxy, even smaller. We observed the field of the unidentified transient supersoft X-ray source RX J0527.8-6954 in order to identify its optical counterpart. Methods. The observation was made with the IFU-GMOS on the Gemini South telescope with the purpose of identifying stars with possible He II or Balmer emission or else of observing nebular extended jets or ionization cones, features that may be expected in CBSS. Results. The X-ray source is identified with a B5e V star that is associated with subarcsecond extended H alpha emission, possibly bipolar. Conclusions. If the primary star is a white dwarf, as suggested by the supersoft X-ray spectrum, the expected orbital period exceeds 21 h; therefore, we believe that the 9.4 h period found so far is not associated to this system. (AU)

• Processo FAPESP: 08/04530-6 - Imageamento múltiplo em estrelas variáveis cataclísmicas
• Beneficiário: Bernardo Walmott Borges
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 08/06988-0 - Caracterização e ambiente de núcleos ativos de baixa luminosidade
• Beneficiário: Tiago Vecchi Ricci
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 08/11087-1 - A natureza dos LINERs
• Beneficiário: Roberto Bertoldo Menezes
• Linha de fomento: Bolsas no Brasil - Doutorado
• Processo FAPESP: 03/12618-7 - Estrutura e evolução de estrelas V Sagittae, CBSS e objetos correlatos
• Beneficiário: Alexandre Soares de Oliveira
• Linha de fomento: Bolsas no Exterior - Pesquisa