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The contact binary system TYC 7275-1968-1 as seen by optical, UV and X-ray observations
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-SN, SuperWASP, CRTS, GAIA, ASAS-3, 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 = 0.8 keV and a luminosity of 1.4
10 erg s 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.Comment: 18 pages, 9 figures, 3 tables, accepted for publication in the New
Astronom