Thalhammer: /* Possible Cyclotron Features */

2022-07-28T16:58:25Z

Possible Cyclotron Features

Thalhammer: Page creation for EXO 2030+375

2022-07-28T16:56:59Z

Page creation for EXO 2030+375

New page

[[Category:Accreting X-ray Pulsars]]

== Other Names ==

* V2246 Cyg ([http://simbad.u-strasbg.fr/simbad/sim-id?Ident=EXO+2030%2B375 SIMBAD])

== Monitoring Data: ==
[https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/exo2030.html Fermi/GBM]
[https://swift.gsfc.nasa.gov/results/transients/EXO2030p375/ Swift/BAT]
[http://maxi.riken.jp/star_data/J2032+376/J2032+376.html MAXI]
[http://integral.esac.esa.int/bexrbmonitor/Plots/sim_plot_EXO2030+375.html BeXRB-Monitor]

== General Characteristics ==

* Discovered 1985 by EXOSAT (<ref name="Parmar89a" />)
* Optical companion: B0 Ve (<ref name="Reig98" />)
* Distance: <math> 7.1,\text{kpc} </math> (<ref name="Wilson02" />)
* Very reliable Type I outburst at around ~100 mCrab over 10-20 days (<ref name="Wilson02" />)
* Three giant outburst to far stretching several months each: 1986, 2006 & 2021
* Kozai-Lidov oscillations in the Be-disk as possible driver of giant outbursts <ref name="Laplace17" />)
* ~0.2 Hz QPO (<ref name="Angelini89" />) with luminosity dependent frequency (<ref name="Reig13" />)

== Orbital Parameters ==

* Orbital period: <math> P_{\text{Orb}} = 46.0211(3)\,\text{d} </math> (<ref name="Wilson08" />)
* Epoch of periastron passage: <math> T_0 = 52802.20(1)\,\text d </math> (<ref name="Wilson08" />)
* Projected semimajor axis:<math> a_{\text x}\sin i = 248(12)\,\text{lt-s} </math> (<ref name="Wilson08" />)
* Eccentricity:<math> e = 0. 0.409(1) </math> (<ref name="Wilson08" />)
* Longitude of periastron: <math>\omega = 212.0(4)^{\circ} </math> (<ref name="Wilson08" />)

== Pulsations ==

* Pulse profiles strongly luminosity dependent: (<ref name="Parmar89b",<ref name="Ferrigno16" />,<ref name="Fuerst17" / />)
** Two main peaks, one dominant at high and one at low luminosities
** Interpreted as switch from pencil- to fan-beam pattern
** One prominent and stable dip in pulse profile
** Another very sharp dip one at specific luminosity
* Pulse profile evolution similar between outbursts

[[File:epiliexo17.png|800px]]

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

== Spectral Analysis ==

* Partially covered cutoffpl + black-body + neutral and ionized Iron lines
* Also fitted with BW07 (<ref name="Epili17" />)
* Spectrum becomes harder with luminosity at lower luminosity and softer at higher luminosity (<ref name="Reig13" />)
*Strong spectral changes with orbital phase:
** Accretion curtail with increased NH and <math> \Delta \Gamma = 1.2 </math> (<ref name="Ferrigno16" />,<ref name="Fuerst17" />)

== Possible Cyclotron Features ==

* During Type I outburst ~36 keV (<ref name="Reig99" />)
* During 2006 giant outburst ~11 keV (<ref name="Wilson08" />)
* During 2006 giant outburst ~63 keV (<ref name="Wilson08" />)

None of those is conclusively detected (<ref name="Epili17" />)

'''References'''

@@ Line 58: / Line 58: @@
 * During Type I outburst ~36 keV (<ref name="Reig99" />)
 * During 2006 giant outburst ~11 keV (<ref name="Wilson08" />)
-* During 2006 giant outburst ~63 keV (<ref name="Wilson08" />)
+* During 2006 giant outburst ~63 keV (<ref name="Klochkov08" />)
 None of those is conclusively detected (<ref name="Epili17" />)
 '''References'''

EXO 2030+375 - Revision history

Thalhammer: /* Possible Cyclotron Features */

Thalhammer: Page creation for EXO 2030+375