2009A&A...506.1261K


Query : 2009A&A...506.1261K

2009A&A...506.1261K - Astronomy and Astrophysics, volume 506, 1261-1267 (2009/11-2)

Continuous monitoring of pulse period variations in Hercules X-1 using Swift/BAT.

KLOCHKOV D., STAUBERT R., POSTNOV K., SHAKURA N. and SANTANGELO A.

Abstract (from CDS):

Monitoring of pulse period variations in accreting binary pulsars is an important tool to study the interaction between the magnetosphere of the neutron star and the accretion disk. While the X-ray flux of the brightest X-ray pulsars have been successfully monitored over many years (e.g. with RXTE/ASM, CGRO/BATSE, Swift/BAT), the possibility to monitor their pulse timing properties continuously has so far been very limited. In our work we show that the Swift/BAT observations can be used to monitor coherent pulsations of bright X-ray sources and use Swift archival data to study one of the most enigmatic X-ray pulsars, Hercules X-1. A quasi-continuous monitoring of the pulse period and the pulse period derivative of an X-ray pulsar, here Her X-1, is achieved over a long time (>4yr). We compare our observational results with predictions of accretion theory and use them to test different aspects of the physical model of the system. In our analysis we use the data accumulated with Swift/BAT starting from the beginning of 2005 (shortly after launch) until the present time. To search for pulsations and for their subsequent analysis we used the count rate measured by the BAT detector in the entire field of view. The slope of the correlation between the locally determined spin-up rate and the X-ray luminosity is measured for Her X-1 and found to be in agreement with predictions of basic accretion torque theory. The observed behaviour of the pulse period together with the previously measured secular decrease of the system's orbital period is discussed in the framework of a model assuming ejection of matter close to the inner boundary of the accretion disk.

Abstract Copyright:

Journal keyword(s): X-rays: binaries - stars: neutron - accretion, accretion disks

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2008 0

Query : 2009A&A...506.1261K

Basic data :
V* HZ Her -- Low Mass X-ray Binary
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
X (X,2A,...), * (BPS,FBS,...), V* (2012A&A,AN,...), LXB (1983MNRAS), UV (2EUVE,EUVE,...), SB* (SBC7,SBC9), Psr (2007ApJS), Ce* (2000AJ), EB* (2014ApJS), gam (INTREF), IR (2MASS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
16 57 49.8110126616 +35 20 32.486555472 (Optical) [ 0.0111 0.0128 90 ] A 2020yCat.1350....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
16 56 01.6961382055 +35 25 05.133707597 [ 0.0111 0.0128 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
058.1490338933623 +37.5230332759150 [ 0.0111 0.0128 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-1.212 -7.856 [0.014 0.016 90] A 2020yCat.1350....0G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
0.1153 [0.0138] A 2020yCat.1350....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
B3/6ep D 1994ApJ...436..319A
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (13) :
U 11.90 [~] D 2007A&A...469..807L
B 14.89 [~] D 2007A&A...467..785N
V 13.63 [~] V4 D 2014ApJS..213....9D
R 13.88 [~] D 2007A&A...467..785N
G 13.617862 [0.020316] C 2020yCat.1350....0G
J 13.729 [0.029] C 2003yCat.2246....0C
H 13.609 [0.031] C 2003yCat.2246....0C
K 13.628 [0.034] C 2003yCat.2246....0C
u (AB) 14.708 [0.005] C 2009ApJS..182..543A
g (AB) 14.602 [0.004] C 2009ApJS..182..543A
r (AB) 13.861 [0.002] C 2009ApJS..182..543A
i (AB) 14.410 [0.004] C 2009ApJS..182..543A
z (AB) 14.193 [0.005] C 2009ApJS..182..543A
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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sedIcon
within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (60) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

X Her X-1 GCRV 27256 2RE J1657+352 2U 1705+34
2A 1655+353 GCRV 27254 2RE J165750+352053 3U 1653+35
3A 1656+353 GCRV 27255 RE J1657+352 4U 1656+35
AN 142.1936 GCRV 27253 RE J165750+352105 V* HZ Her
1AXG J165750+3520 GSC 02598-01298 ROTSE1 J165749.74+352032.4 WEB 14036
BPS BS 16552-0071 1H 1656+354 2RXP J165749.4+352033 2XMM J165749.8+352032
CRTS J165749.7+352032 H 1656+354 RX J1657.8+3521 1XRS 16560+354
2E 1656.0+3525 H 1657+35 RX J1657.8+3520 XSS J16581+3522
2E 3791 INTREF 730 1RXS J165749.6+352022 [BM83] X1656+354
1ES 1656+35.4 Lan 78 SBC7 602 [FS2003] 0862
2EUVE J1657+35.3 1M 1656+354 SBC9 937 [KRL2007b] 211
EUVE J1657+35.3 2MASS J16574981+3520323 SDSS J165749.81+352032.4 [ZEH2003] RX J1657.8+3520 1
FBS B 587 2MAXI J1658+353 1SWASP J165749.80+352032.8 AAVSO 1654+35
FBS 1656+354 PBC J1657.8+3520 SWIFT J1657.7+3518 Gaia DR3 1338822021487330304
GAT 227 RBS 1614 TIC 341738544 Gaia DR2 1338822021487330304

References (2008 between 1850 and 2023) (Total 2008)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


V* : 4    distance : 1    PLX : 2    PM : 2    MK : 1   

   

Observing logs


ISO : 1    IUE : 125    XMM : 21   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : V* HZ Her

Link by name to the catalogue in VizieR :

2E 3791 EUVE J1657+35.3 FBS B 587 FBS 1656+354 GSC 02598-01298
Lan 78 2MASS J16574981+3520323 2RE J1657+352 2RE J165750+352053 1RXS J165749.6+352022
SDSS J165749.81+352032.4 V* HZ Her Gaia DR3 1338822021487330304 Gaia DR2 1338822021487330304

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