Kuehnel: Kuehnel moved page Cep X-4 to Cepheus X-4

2018-04-18T11:28:31Z

Kuehnel moved page Cep X-4 to Cepheus X-4

Kuehnel: Created page with "Category:Accreting X-ray Pulsars Also known as: GS 2138 + 56, V* V490 Cep [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cep+x-4&submit=SIMBAD+search Simbad] '''Moni..."

2018-04-18T11:28:12Z

Created page with "Category:Accreting X-ray Pulsars Also known as: GS 2138 + 56, V* V490 Cep [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cep+x-4&submit=SIMBAD+search Simbad] '''Moni..."

New page

[[Category:Accreting X-ray Pulsars]]

Also known as: GS 2138 + 56, V* V490 Cep
[http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cep+x-4&submit=SIMBAD+search Simbad]

'''Monitoring Data:''' [http://www.batse.msfc.nasa.gov/batse/pulsar/data/sources/gs2138.html CGRO/BATSE] [Swift][http://maxi.riken.jp/top/index.php?cid=1&jname=J2139+569 MAXI] [http://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/cepx4.html Fermi/GBM pulsed flux]
[http://xte.mit.edu/asmlc/srcs/cepx4.html RXTE/ASM]

= Coordinates =

{| class="wikitable"
|Ra
| 21h 39m 30.6s
|Dec
| +56º 59' 12.9''
|-
| l
| 99.01
| b
| +3.31
|}
(<ref name="Roche97" />)

= Binary System =

Known to be a Be high mass X-ray binary system.

== Distance ==

Determined to be 3.8 ± 0.6 kpc (<ref name="BonnetBidaudMouchet98" />)

==Orbit==

'''Period:''' Between 20-23 days<ref name="KoyamaK91" /><ref name="McBride07" />

==Companion==

'''Spectral Type:''' B1 V-B2 V

'''Magnitude:''' mv = 14.2, Mv = -(2.5-3.8)

(<ref name="BonnetBidaudMouchet98" />)

=Available Data=

* '''RXTE''': Mostly individual observations in 1997, 2002 and 2004 for ≤3 ksec. Up to 50 ksec in 1997 and 2002.
* '''RXTE''': As part of the All-Sky Monitor Long Term Observed Sources. First observed in 1996.
* '''Ginga''': Various observations in April 1988.
* '''INTEGRAL''': Many pointed observations as part of CORE and GPS.
* '''Suzaku''': None as of yet.

=Flux=

'''Luminosity''':
* Quiescent: Lx(0.1-100keV) = (3.3-6.2) 1033 erg.s-1 (<ref name="BonnetBidaudMouchet98" />)
* Outburst: Fermi/GBM detected the 2009 outburst where Lx(12-25 keV) = 4.8380 1035 erg.s-1 was measured. (<ref name="Beklen09" />)

'''Cyclotron Resonance''': Detected at 30.7 keV. (<ref name="Mihara91" />) (<ref name="McBride07" />). Asymmetric shape and luminosity dependence found by <ref name="Fuerst15" />.

'''Spectrum''':

[[File:simg16.gif|1865]]

Figure taken from <ref name="McBride07" />

=Pulse Profile=

'''Period''': 66.30 s (<ref name="McBride07" />)

[[File:img49.gif|2004]]

Pulse profiles in the 2-5keV for various observations. Luminosity decreases from top to bottom.

'''References'''

← Older revision	Revision as of 11:28, 18 April 2018
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Cepheus X-4 - Revision history

Kuehnel: Kuehnel moved page Cep X-4 to Cepheus X-4

Kuehnel: Created page with "Category:Accreting X-ray Pulsars Also known as: GS 2138 + 56, V* V490 Cep [http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Cep+x-4&submit=SIMBAD+search Simbad] '''Moni..."