The contact binary system TYC 7275-1968-1 as seen by optical, UV and X-ray observations
Abstract
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 kT = 0.8-0.1+0.9 keV and a luminosity of 1.4-0.2+0.1 × 1031 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.
- Publication:
-
New Astronomy
- Pub Date:
- April 2024
- DOI:
- 10.1016/j.newast.2023.102145
- arXiv:
- arXiv:2310.19712
- Bibcode:
- 2024NewA..10702145L
- Keywords:
-
- (Stars:) binaries: eclipsing;
- Stars: mass-loss;
- Stars: individual (TYC 7275-1968-1);
- Astrophysics - Solar and Stellar Astrophysics;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 18 pages, 9 figures, 3 tables, accepted for publication in the New Astronomy