MAXI/GSC detection of a possible X-ray flare from an RS CVn star AR Psc
ATel #9288; Y. Nakamura, Y. Tsuboi, R. Sasaki (Chuo U.), M. Serino(RIKEN), S. Nakahira(JAXA), S. Ueno, H. Tomida, M. Ishikawa, Y. E. Nakagawa, Y. Sugawara (JAXA), T. Mihara, M. Sugizaki, W. Iwakiri, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN), N. Kawai, N. Isobe, S. Sugita, T. Yoshii, Y. Tachibana, Y. Ono, T. Fujiwara (Tokyo Tech), A. Yoshida, T. Sakamoto, Y. Kawakubo, Y. Kitaoka (AGU), H. Tsunemi, R. Shomura (Osaka U.), H. Negoro, M. Nakajima, K. Tanaka, T. Masumitsu, T. Kawase (Nihon U.), Y. Ueda, T. Kawamuro, T. Hori, A. Tanimoto (Kyoto U.), M. Yamauchi, K. Furuya (Miyazaki U.), K. Yamaoka (Nagoya U.)
on 31 Jul 2016; 14:45 UT
Credential Certification: Yohko Tsuboi (tsuboi@phys.chuo-u.ac.jp)
Subjects: X-ray, Binary, Star, Transient, Variables
On July 30th 2016, the MAXI/GSC nova-alert system triggered on a possible X-ray flare from an RS CVn star AR Psc.
The intense X-ray emission was detected from a transit starting at 21:52 UT on July 29th 2016 to the next transit starting at 23:25 UT on 29th.
The position was determined from the two scan transits as (20.541 deg, 7.138 deg) = (01 22 09, +07 08 16) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.48 deg and 0.31 deg respectively. The roll angle of long axis from the north direction is 51.0 deg.
This position is consistent with that of an RS CVn star, AR Psc, which is listed in the ROSAT Bright Source Catalog. No other source is listed in the catalog in the error region.
The 4-10 keV flux averaged over the two scan transits was about 190+-60 mCrab.
These are corresponding to a luminosity of 1× 10 33 ergs/s for an assumed distance of 45 pc. This is the first detection of this source with MAXI/GSC.