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Increased optical activity of Be/X binary system SAX 2103.5+4545 suggests a new outburst in X-rays

ATel #2925; U., Kiziloglu, N., Kiziloglu, A. Baykal (METU); S. C. Inam (Baskent)
on 12 Oct 2010; 11:26 UT
Credential Certification: Umit Kiziloglu (umk@astroa.physics.metu.edu.tr)

Subjects: Optical, Binary, Transient, Pulsar

Referred to by ATel #: 2928, 4068

We report on the recent optical activity of the high-mass X-ray binary system SAX 2103.5+4545. The source was monitored by ROTSEIIId telescope (Akerlof et al., 2003, PASP, 115, 132) on Bakirlitepe, TUBITAK National Observatory, Turkey. After about 3 years of its optical quiescence, the system shows an increase in the optical brightness starting from August 2010, from its quiescence value of R ~13.2 in ROTSE R-band. The previous 2007 X-ray outburst reported in ATEL #1063 and ATEL #1064 of the source was occurred at optical brightness of R ~12.8 (Kiziloglu et al. 2009, A&A, 508, 895). The object is at R 12.72+/-0.02 on October 11, 2010. We have observed the optical counterpart of the X-ray binary SAX2103.5+4545 with the RTT150 telescope and TFOSC. The spectra obtained on September 17, 2010 showed a weak H alpha line emission feature with a double-peak profile of equivalent width 0.42+-0.02 angstrom. The brightening of the system and H alpha line emission shows a new disc formation around the Be star. All the optical activity observed are signatures of a new X-ray activity of the source.