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6.7-GHz observations of the RS CVn type star HR1099 after the large X-ray flare

ATel #10786; FirstnaK. Takefuji (NICT), Y. Yonekura (Ibaraki U.), K. Niinuma (Yamaguchi U.) H. Kawai, and Y. Tsuboi (Chuo U.)me1 Lastname1 (Affil1), Firstname2 Lastname2 (Affil2)...
on 27 Sep 2017; 00:40 UT
Credential Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)

Subjects: Radio, Binary, Star, Transient, Variables

6.7 GHz (from 6600 to 7112 MHz) interferometric observations of the RS CVn type star HR1099 (V711 Tau) were carried out after the alert from MAXI/GSC (Kawai et al. 2017, ATel #10753) using the 50 km baseline between the Kashima 34 m radio telescope and the Hitachi 32 m radio telescope.

The flux density of the detected source at the position of HR1099 (RA = 03h36m47.29038, DEC=+00d35'15.9327, position from SIMBAD) was 23.0 +- 0.9 mJy at UT 14h on 15 Sep 2017, and it slightly increased to 38.8 +- 0.8 mJy at UT 15h on 16 Sep 2017, where we supposed the nearby quasar 0310+013 as the calibrator has a flux density of 500 mJy. Quiescent emission level for this star has been reported as 5–25 mJy range (Drake, Simon, & Linsky 1989). This means that HR1099 is at quiescent level, eight hours after the peak of the big X-ray flare (Kawai et al. 2017, ATel #10753), at the longest.