Suzaku Observation : 409032020

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '409032020'          / Observation identification string
OBSERVER= 'ALAN PETER SMALE'   / Principal Investigator
OBJECT  = 'XB1916-053'         / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             289.6995 / planned target R.A.(deg)
DEC_OBJ =              -5.2381 / planned target DEC.(deg)
RA_NOM  = 2.897015000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -5.250300000000000E+00 / Declination of target (deci. deg)
PA_NOM  =             261.8034 / nominal position angle from north to DETY(deg)
MEAN_EA1=     289.701542629002 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      95.250272497992 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     188.196626576575 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2014-10-18T12:20:17' / Start date of observations
DATE-END= '2014-10-22T02:40:09' / End date of observations
TSTART  = 4.669507830000000E+08 / time start
TSTOP   = 4.672608003376862E+08 / time stop
TELAPSE = 3.100173376861811E+05 / elapsed time
ONTIME  = 1.404659276646972E+05 / On-source time
EXPOSURE= 1.404659276646972E+05 / Exposure time
MJD-OBS = 5.694852369425926E+04 / MJD of data start time
FILIN001= 'ae409032020xi0_0_3x3n090t_cl.evt.gz' / Input file name
SEQPNUM =                    3 / Number of times this dataset processed
PROCVER = '3.0.22.44'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20160607_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae409032020xi0_0_5x5n090t_cl.evt.gz' / Input file name
FILIN003= 'ae409032020xi1_0_3x3n140b_cl.evt.gz' / Input file name
FILIN004= 'ae409032020xi1_0_5x5n140b_cl.evt.gz' / Input file name
FILIN005= 'ae409032020xi3_0_3x3n092a_cl.evt.gz' / Input file name
FILIN006= 'ae409032020xi3_0_5x5n092a_cl.evt.gz' / Input file name
COMMENT -------------------------
COMMENT BITPIX compressed from 32 to 8.
COMMENT Pixel values greater than 255 was set to 255.
COMMENT This file was made for JUDO-Suzaku.
COMMENT -------------------------
COMMENT   FITS (Flexible Image Transport System) format is defined in 'Astronomy

Abstract:

XB1916-053 is a prototypical dipping low mass X-ray binary (LMXB) with a dip recurrence period of 3000.6+-0.2s. However, extensive optical observations also show a longer stable period of 3027s. The former is most likely the orbital period, and the latter the superhump period caused by the precession of an elliptical accretion disk at a period of 3.9 days, representing the beat period between optical and X-ray periods. The morphology of the X-ray dips does indeed change dramatically over several days, but existing data suggest a somewhat longer period for the dip morphology cycle of 4.7 days. Here we propose a 300ks Suzaku observation of XB1916-053 with as few interruptions as possible, to conduct a definitive timing and spectroscopic study of its disk emission and dipping activity.