Autor(es)

Lima, I. J. ; Mattiuci, A. C. ; Luna, G. J. M. ; Oliveira, A. S. ; Rodrigues, C. V. ; Palivanas, N. ; Nunez, N. E.

• Tipo de documento: Artigo Científico
• Fonte: NEW ASTRONOMY; v. 107, p. 7-pg., 2023-11-10.

Resumo

We present an analysis of publicly available X-ray and optical observations of TYC 7275-1968-1, a contact binary, red nova progenitor candidate. The long optical time series of ASAS-3, SuperWASP, CRTS, Gaia, ASAS-SN, and TESS enabled us to improve its orbital period to 0.3828071 +/- 0.0000026 d. We show the presence of an X-ray and UV source associated with TYC 7275-1968-1 from Neil Gehrels Swift Observatory, that was previously assumed to be the counterpart of CD -36 8436 (V1044 Cen), a symbiotic star located 22 arcsec from the red nova candidate. The X-ray data indicate the presence of a region with a temperature of kappa T = 0.8(-0.1)(+0.9) keV and a luminosity of 1.4(-0.2)(+0.1) x 10(31) erg s (-1) in the range 0.3 - 10 keV. The detection of X-rays and modulated UV emission suggests that both components of the binary are chromospherically active. (AU)

• Processo FAPESP: 17/20309-7 - Descoberta e caracterização de novas variáveis cataclísmicas magnéticas
• Beneficiário: Alexandre Soares de Oliveira
• Modalidade de apoio: Auxílio à Pesquisa - Regular