2003MNRAS.342..446L

Query : 2003MNRAS.342..446L

2003MNRAS.342..446L - Mon. Not. R. Astron. Soc., 342, 446-452 (2003/June-3)

Modelling the extreme ultraviolet emission during the low state of Hercules X-1.

LEAHY D.A.

Abstract (from CDS):

Hercules X-1 was observed for extended periods during its low state by the Extreme Ultraviolet Explorer (EUVE). These observations yield low-state light curves in the extreme ultraviolet (EUV) which are compared with a composite model here. The model includes reflection of soft X-rays off the companion HZ Her, including the shadowing of HZ Her by the accretion disc, and emission from the accretion disc surface. Four different geometries for the accretion disc were adopted, all derived from the RXTE All-Sky Monitor (ASM) 35-day light-curve modelling. Three were thin disc models for different system inclinations, i, and the fourth was a disc with a thick inner ring for i = 85°.

With the HZ Her reflection model, with no free parameters except normalization, and a simple model for the disc emission, the models fit the data well. The disc emission accounts for about half of the EUV flux, depending on which accretion disc geometry is used. The disc geometry that best fits the EUV light curves is the disc with a thick inner ring, which is the same model that gives the best fit to the RXTE/ASM light curve.


Abstract Copyright: 2003 RAS

Journal keyword(s): binaries: eclipsing - stars: individual: HZ Her/Her X-1 - stars: neutron

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 - 2026 		#notes
1 V* HZ Her LXB 16 57 49.8110126616 +35 20 32.486555472 11.90 14.89 13.63 13.88   B3/6ep 2172 0

Query : 2003MNRAS.342..446L

Basic data :
V* HZ Her -- Low Mass X-ray Binary
Other object types: otypes_help 		X (2022MNRAS,X,...), * (BPS,FBS,...), V* (2012A&A,AN,...), LXB (1983MNRAS), UV (2EUVE,EUVE,...), SB* (SBC7,SBC9), EB* (2014ApJS), Psr (2007ApJS), Ce* (2000AJ), gam (INTREF), NIR (2MASS), Opt (SDSS)
ICRS coord. (ep=J2000) : 		16 57 49.8110126616 +35 20 32.486555472 (Optical) [ 0.0111 0.0128 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		16 56 01.6961382055 +35 25 05.133707597 [ 0.0111 0.0128 90 ]
Gal coord. (ep=J2000) : 		058.1490338933623 +37.5230332759150 [ 0.0111 0.0128 90 ]
Proper motions mas/yr : 		-1.212 -7.856 [0.014 0.016 90] A 2020yCat.1350....0G
Parallaxes (mas): 		0.1153 [0.0138] A 2020yCat.1350....0G
Spectral type: 		B3/6ep D 1994ApJ...436..319A
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
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Identifiers (62) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

X Her X-1 GCRV 27254 RE J1657+352 4U 1656+35
2A 1655+353 GCRV 27255 RE J165750+352105 V* HZ Her
3A 1656+353 GCRV 27253 ROTSE1 J165749.74+352032.4 WEB 14036
AN 142.1936 GSC 02598-01298 2RXP J165749.4+352033 2XMM J165749.8+352032
1AXG J165750+3520 1H 1656+354 RX J1657.8+3521 1XRS 16560+354
BPS BS 16552-0071 H 1656+354 RX J1657.8+3520 XSS J16581+3522
CRTS J165749.7+352032 H 1657+35 1RXS J165749.6+352022 ZTF J165749.81+352032.4
2E 1656.0+3525 INTREF 730 SBC7 602 [BM83] X1656+354
2E 3791 Lan 78 SBC9 937 [FS2003] 0862
1ES 1656+35.4 1M 1656+354 SDSS J165749.81+352032.4 [KRL2007b] 211
2EUVE J1657+35.3 2MASS J16574981+3520323 SRGA J165749.5+352028 [ZEH2003] RX J1657.8+3520 1
EUVE J1657+35.3 2MAXI J1658+353 1SWASP J165749.80+352032.8 AAVSO 1654+35
FBS B 587 PBC J1657.8+3520 SWIFT J1657.7+3518 Gaia DR3 1338822021487330304
FBS 1656+354 RBS 1614 TIC 341738544 Gaia DR2 1338822021487330304
GAT 227 2RE J1657+352 2U 1705+34
GCRV 27256 2RE J165750+352053 3U 1653+35

References (2172 between 1850 and 2026) (Total 2172)
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 Description of Measurements

Distance : 1    Var : 7    Plx : 2    PM : 2    SpT : 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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