2006A&A...445.1061C

Query : 2006A&A...445.1061C

2006A&A...445.1061C - Astronomy and Astrophysics, volume 4451061-1067 (2006/1-3)

The evolutionary status of EK Cephei: rotating and standard models.

CLARET A.

Abstract (from CDS):

The evolutionary status of the double-lined eclipsing binary EK Cep is reanalysed. Due to problems with the empirical determination of its effective temperatures, we have used a different approach to compare the observations with theoretical models: we have adopted the effective temperature ratio, which is a better determined parameter from light curve analysis, instead of their absolute values. Such an approach is supported observationally by the inconsistency found in the photometric distances for both components of EK Cep. By using the effective temperature ratio, masses, radii, apsidal-motion rate and lithium depletion, we have found that standard models are able to fit the physical properties of EK Cep simultaneously at the same isochrone. In the case of rotating models, we have also found acceptable solutions without the need for a very fast rotating core. On the other hand, the apsidal-motion rate of EK Cep is critically revised.

Abstract Copyright: ∼

Journal keyword(s): stars: binaries: eclipsing - stars: evolution - stars: rotation

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* EK Cep SB* 21 41 21.5042268336 +69 41 34.112933916   7.95 7.89     A0V 222 0

Query : 2006A&A...445.1061C

Basic data :
V* EK Cep -- Spectroscopic Binary
Other object types: otypes_help 		EB* (), * (2022AJ,HD,...), SB* (2022yCat,SBC7,...), V* (V*), UV (TD1), NIR (2MASS)
ICRS coord. (ep=J2000) : 		21 41 21.5042268336 +69 41 34.112933916 (Optical) [ 0.0209 0.0199 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		21 40 29.8280120763 +69 27 50.772871266 [ 0.0209 0.0199 90 ]
Gal coord. (ep=J2000) : 		107.7237518985777 +12.6532129464498 [ 0.0209 0.0199 90 ]
Proper motions mas/yr : 		22.017 4.864 [0.025 0.024 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -10.90 [0.74] / z(~) -0.000036 [0.000002] / cz -10.90 [0.74]
   A 2007AN....328..889K
Parallaxes (mas): 		5.8132 [0.022] A 2020yCat.1350....0G
Spectral type: 		A0V C 2009ApJS..180..117A
Fluxes (6) :
B 7.95 [0.02] D 2000A&A...355L..27H
V 7.89 [0.01] D 2000A&A...355L..27H
G 7.853643 [0.002778] C 2020yCat.1350....0G
J 7.632 [0.026] C 2003yCat.2246....0C
H 7.581 [0.026] C 2003yCat.2246....0C
K 7.559 [0.031] C 2003yCat.2246....0C
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Identifiers (23) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 206821 HIP 107083 SBC9 1327 V* EK Cep
AG+69 925 2MASS J21412155+6941342 SV* BV 262 WEB 19343
AP J21412155+6941342 PPM 23115 SV* GR 15 Gaia DR2 2224084016064993536
BD+69 1191 ROT 6355 TD1 28408 Gaia DR3 2224084016064993536
GSC 04466-02120 SAO 19585 TIC 322262620 Gaia DR1 2224084011767043840
HIC 107083 SBC7 873 TYC 4466-2120-1

References (222 between 1850 and 2026) (Total 222)
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

Velocities : 2    Distance : 2    Var : 4    Rot : 2    Fe/H : 2    Plx : 5    PM : 5    SpT : 2   

   

Observing logs
IUE : 14   

   

External archives :

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

Link by name to the catalogue in VizieR :

HD 206821 AG+69 925 AP J21412155+6941342 BD+69 1191 GSC 04466-02120
HIC 107083 HIP 107083 2MASS J21412155+6941342 PPM 23115 SAO 19585
TD1 28408 TYC 4466-2120-1 V* EK Cep Gaia DR2 2224084016064993536 Gaia DR3 2224084016064993536
Gaia DR1 2224084011767043840

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