Suzaku Observation : 406011010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '406011010'          / Observation identification string
OBSERVER= 'HIROKAZU ODAKA'     / Principal Investigator
OBJECT  = 'OAO1657-415'        / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             255.2038 / planned target R.A.(deg)
DEC_OBJ =             -41.6560 / planned target DEC.(deg)
RA_NOM  = 2.552026000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = -4.166670000000000E+01 / Declination of target (deci. deg)
PA_NOM  =             285.9012 / nominal position angle from north to DETY(deg)
MEAN_EA1=     255.202562368924 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=     131.666748054720 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     164.098806978447 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2011-09-26T09:34:20' / Start date of observations
DATE-END= '2011-09-28T16:00:11' / End date of observations
TSTART  = 3.703469377830522E+08 / time start
TSTOP   = 3.705407998819646E+08 / time stop
TELAPSE = 1.938620989123583E+05 / elapsed time
ONTIME  = 8.474166191840172E+04 / On-source time
EXPOSURE= 8.474166191840172E+04 / Exposure time
MJD-OBS = 5.583042363387792E+04 / MJD of data start time
FILIN001= 'ae406011010xi0_0_2x2n090l_cl.evt.gz' / Input file name
SEQPNUM =                    2 / 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= 'ae406011010xi0_0_5x5n090l_cl.evt.gz' / Input file name
FILIN003= 'ae406011010xi1_0_3x3n131b_cl.evt.gz' / Input file name
FILIN004= 'ae406011010xi1_0_5x5n131b_cl.evt.gz' / Input file name
FILIN005= 'ae406011010xi3_0_2x2n092a_cl.evt.gz' / Input file name
FILIN006= 'ae406011010xi3_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:

We propose Suzaku observation of accretion-powered pulsar OAO 1657-415 to study matter accretion onto the neutron star. This object is a unique high mass X-ray binary (HMXB) that shows intermediate characteristics between wind-fed accretion pulsars and disk-fed accretion pulsars. High S/N spectra obtained by XIS, HXD-PIN/GSO with short exposure time (1 ks) allow us to investigate short-time variability of physical states of the accretion column, which is close to the neutron star surface. The proposed observation also reveals the matter distribution in the HMXB by using a 6.4-keV iron fluorescence line and hard X-rays. The data at the phase of eclipse egress provide essential information about the stellar wind and atmosphere of the companion star to constrain its stellar type in question.