Soft X-ray Transient in Mira AB Chandra Observations of Mira AB symbiotic-like system obtained in Dec. 2003 detected an unexpected bright soft source (<0.7 keV) in addition to the previously observed harder (1-4 keV) emission which has been attributed to the accretion disk around Mira B. The newly discovered soft X-ray source could indicate an instability in the accretion disk, an accretion related outburst in the system, or a flare-like activity in Mira A. We request DD time to carry out HST/STIS imaging and spectroscopy of Mira AB at UV wavelengths, where signatures of these processes are very likely to be found. Because of the likely transient nature of this phenomenon, timely HST observations are critical for determining the nature and the characteristics of the soft X-ray source and therefore we cannot wait for Cucle 13 observatios including TOO observations.
gets munched 0 false false false false false SUPPORTED EXT-STAR INTERACTING BINARY AGB STAR ACCRETION DISK SYMBIOTIC STAR B-V = 1.42+/-0.20; TYPE=M5III ; F-CONT(3000)=1.0+/-0.6e-14 ; F-LINE(2803)=5.0+/-3.0e-13 ; W-LINE(2803)=0.5+/-0.1; F-CONT(3600)=2.0+/-1.2e-14; F-CONT(5006)=3.5+/-2.0e-13 HD14386 MIRA J2000 00 00 0.00 +00 00 0.00 J2000 EXT-STAR ACCRETION DISK B3-B5 V-IV WDO SYMBIOTIC STAR Offset coordinates measured from an HST image X31G0108T (GO5822) F-CONT(3000)=3.0+/-1.0e-13; F-CONT(1600)=3.0+/-1.0e-14; F-LINE(2803)=7.0+/-2.0e-12; W-LINE(2803)=2.5+/-0.4; F-LINE(1550)=2.0+/-0.5e-12; W-LINE(1550)=2.0+/-0.5 OMI-CET-B VZ Ceti 00 00 0.00 +00 00 0.00 J2000 EXT-STAR ACCRETION DISK B3-B5 V-IV WDO SYMBIOTIC STAR Offset coordinates measured from an HST image o8wy01040 visit 1 Go/DD 10091 F-CONT(3000)=3.0+/-1.0e-13; F-CONT(1600)=3.0+/-1.0e-14; F-LINE(2803)=7.0+/-2.0e-12; W-LINE(2803)=2.5+/-0.4; F-LINE(1550)=2.0+/-0.5e-12; W-LINE(1550)=2.0+/-0.5 OMI-CET-B VZ Ceti 00 00 0.00 +00 00 0.00 J2000 Since we do not know the cause of the X-ray transient we would like to determine if there is a significant change in the flux in the UV spectrum before we obtain the MAMA observations because of bright object protection concerns. false (Tic-Visit :proposal-id 10091 :visit-id "02" :proposal-version -1 :trans-version "20031014" :date "04-Feb-2004 14:44:27.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 230624 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10091 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10091 :visit-id "02" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2707 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false Visit 2 is on hold in expectation of the results from the CCD UV spectroscopy in Visit 1. If the brightness of the target does not exceed the MAMA limits we'll proceed with Visit 2 and Visit 3 (Tic-Visit :proposal-id 10091 :visit-id "03" :proposal-version -1 :trans-version "20031014" :date "04-Feb-2004 13:13:13.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "24" :si-bright-earth-limb-angle 20.0 :data-volume 174416 :tdrss-contact-duration 0 ) (Tic-Obset :proposal-id 10091 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 10091 :visit-id "03" :orbit-number 1 :pcs-time 365 :si-vis-utilization 2589 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) (Tic-Orbit :proposal-id 10091 :visit-id "03" :orbit-number 2 :pcs-time 300 :si-vis-utilization 2130 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3200 :pcs-gap 0 ) false Visit 3 is on hold in expectation of the results from the CCD UV spectroscopy in Visit 1. If the brightness of the target does not exceed the MAMA limits we'll proceed with Visit 2 and Visit 3