Suzaku Observation : 403033010

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Fits Header

TELESCOP= 'SUZAKU  '           / Telescope (mission) name
OBS_ID  = '403033010'          / Observation identification string
OBSERVER= 'YOSHITOMO MAEDA'    / Principal Investigator
OBJECT  = 'WR140   '           / Name of observed object
OBS_REM = '        '           / remark on observation
RA_OBJ  =             305.1167 / planned target R.A.(deg)
DEC_OBJ =              43.8544 / planned target DEC.(deg)
RA_NOM  = 3.051135000000000E+02 / Right Ascension of target (deci. deg)
DEC_NOM = 4.392720000000000E+01 / Declination of target (deci. deg)
PA_NOM  =              90.2945 / nominal position angle from north to DETY(deg)
MEAN_EA1=     305.113472756965 / mean of the 1st ZYZ-Euler angle (deg)
MEAN_EA2=      46.072778447244 / mean of the 2nd ZYZ-Euler angle (deg)
MEAN_EA3=     359.705483656399 / mean of the 3rd ZYZ-Euler angle (deg)
DATE-OBS= '2008-04-09T05:33:13' / Start date of observations
DATE-END= '2008-04-09T17:20:18' / End date of observations
TSTART  = 2.610344590000000E+08 / time start
TSTOP   = 2.610767977319995E+08 / time stop
TELAPSE = 4.233873199945688E+04 / elapsed time
ONTIME  = 2.162530940392613E+04 / On-source time
EXPOSURE= 2.162530940392613E+04 / Exposure time
MJD-OBS = 5.456523290722222E+04 / MJD of data start time
FILIN001= 'ae403033010xi0_0_3x3n066a_cl.evt.gz' / Input file name
SEQPNUM =                    2 / Number of times this dataset processed
PROCVER = '3.0.22.43'          / Processing script version
MK1STVER= 'mk1stfits20120530'  / Version of mk1stfits used
SOFTVER = 'Hea_08Feb2016_V6.18_Suzaku_14Nov2013_V22' / Version of HEADAS used
CALDBVER= 'hxd20110913_xis20151005_xrt20110630_xrs20060410' / Version of CALDB u
FILIN002= 'ae403033010xi0_0_5x5n066a_cl.evt.gz' / Input file name
FILIN003= 'ae403033010xi1_0_3x3n069b_cl.evt.gz' / Input file name
FILIN004= 'ae403033010xi1_0_5x5n069b_cl.evt.gz' / Input file name
FILIN005= 'ae403033010xi3_0_3x3n066a_cl.evt.gz' / Input file name
FILIN006= 'ae403033010xi3_0_5x5n066a_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:

WR 140 (WC7+O4I) is a long-period (P=7.94 yrs), extremely eccentric (e=0.88) massive binary. Winds from each star collide and produce strong changes in the X-ray spectrum and the production of thick dust shells. All the orbital and stellar parameters are measured, so WR 140 is the best shock-physics laboratory known. X-ray observations are crucial to understand the hot shocked gas and the mass loss phenomena. WR140's next periastron passage is in Jan. 2009. We propose a series of Suzaku observations to precisely determine the change in the X-ray emitting plasma and in the cool absorbing wind from the WC7 star, and the amount of hard X-ray emission (E>20 keV) from particle acceleration in the shock. This may be the only opportunity to observe a periastron passage of WR 140 with Suzaku.