2018A&A...615A..62V


Query : 2018A&A...615A..62V

2018A&A...615A..62V - Astronomy and Astrophysics, volume 615A, 62-62 (2018/7-1)

Overshooting calibration and age determination from evolved binary systems. A statistical investigation on biases and random variability.

VALLE G., DELL'OMODARME M., PRADA MORONI P.G. and DEGL'INNOCENTI S.

Abstract (from CDS):


Aims. The capability of grid-based techniques to estimate the age together with the convective core overshooting efficiency of stars in detached eclipsing binary systems for main sequence stars has previously been investigated. We have extended this investigation to later evolutionary stages and have evaluated the bias and variability on the recovered age and convective core overshooting parameter accounting for both observational and internal uncertainties.
Methods. We considered synthetic binary systems, whose age and overshooting efficiency should be recovered by applying the SCEPtER pipeline to the same grid of models used to build the mock stars. We focus our attention on a binary system composed of a 2.50M primary star coupled with a 2.38M secondary. To explore different evolutionary scenarios, we performed the estimation at three different times: when the primary is at the end of the central helium burning, when it is at the bottom of the RGB, and when it is in the helium core burning phase. The Monte Carlo simulations have been carried out for two typical values of accuracy on the mass determination, that is, 1% and 0.1%.
Results. Adopting typical observational uncertainties, we found that the recovered age and overshooting efficiency are biased towards low values in all three scenarios. For an uncertainty on the masses of 1%, the underestimation is particularly relevant for a primary in the central helium burning stage, reaching -8.5% in age and -0.04 (-25% relative error) in the overshooting parameter β. In the other scenarios, an undervaluation of the age by about 4% occurs. A large variability in the fitted values between Monte Carlo simulations was found: for an individual system calibration, the value of the overshooting parameter can vary from β=0.0 to β=0.26. When adopting a 0.1% error on the masses, the biases remain nearly unchanged but the global variability is suppressed by a factor of about two. We also explored the effect of a systematic discrepancy between the artificial systems and the model grid by accounting for an offset in the effective temperature of the stars by±150K. For a mass error of 1% the overshooting parameter is largely biased towards the edges of the explored range, while for the lower mass uncertainty it is basically unconstrained from 0.0 to 0.2. We also evaluate the possibility of individually recovering the β value for both binary stars. We found that this is impossible for a primary near to central hydrogen exhaustion owing to huge biases for the primary star of +0.14 (90% relative error), while in the other cases the fitted β are consistent, but always biased by about -0.04 (-25% relative error). Finally, the possibility to distinguish between models computed with mild overshooting from models with no overshooting was evaluated, resulting in a reassuring power of distinction greater than 80%. However, the scenario with a primary in the central helium burning was a notable exception, showing a power of distinction lower than 5%.

Abstract Copyright: © ESO 2018

Journal keyword(s): binaries: eclipsing - stars: fundamental parameters - methods: statistical - stars: evolution - stars: interiors

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 - 2021
#notes
1 * alf Aur SB* 05 16 41.35871 +45 59 52.7693 1.33 0.88 0.08 -0.52 -0.96 G3III: 1150 0

    Equat.    Gal    SGal    Ecl

Query : 2018A&A...615A..62V

Basic data :
* alf Aur -- Spectroscopic 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:
RS* (), * (*,AG,...), X (1E,2E,...), ** (**,ADS,...), UV (CEL,2EUVE,...), SB* (2004A&A,CABS,...), PM* (Ci,LSPM,...), IR (IRAS,IRC,...), V* (CSV,NSV,...)
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) :
05 16 41.35871 +45 59 52.7693 (Optical) [ 4.75 2.47 90 ] A 2007A&A...474..653V
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) :
05 12 59.47233 +45 56 57.9434 [ 4.75 2.47 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) :
162.58847600 +04.56643053 [ 4.75 2.47 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 :
75.25 -426.89 [0.54 0.28 0] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 29.19 [0.07] / z(~) 0.000097 [0.000000] / cz 29.19 [0.07]
   A 2004MNRAS.349.1069K
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):
76.20 [0.46] A 2007A&A...474..653V
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:
G3III: C 1989ApJS...71..245K
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 (8) :
U 1.33 [~] C 1966CoLPL...4...99J
B 0.88 [~] C 1966CoLPL...4...99J
V 0.08 [~] C 1966CoLPL...4...99J
R -0.52 [~] C 1966CoLPL...4...99J
I -0.96 [~] C 1966CoLPL...4...99J
J -1.29 [~] C 1966CoLPL...4...99J
H -1.72 [~] C 2002yCat.2237....0D
K -1.78 [~] C 1966CoLPL...4...99J
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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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 (74) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* alf Aur 2EUVE J0516+45.9 LTT 11619 SBC9 306
* 13 Aur EUVE J0516+45.9 2MASS J05164138+4559525 SKY# 8333
** ANJ 1 FK5 193 N30 1121 SV* ZI 360
** FRH 1A GC 6427 NAME Capella TD1 4244
ADS 3841 AP GCRV 3121 NLTT 14766 TIC 368326352
AG+45 512 GEN# +1.00034029 NSV 1897 TYC 3358-3141-1
ASCC 317037 GJ 194 PLX 1187 UBV 5009
BD+45 1077 GJ 194 B PMC 90-93 139 USNO-B1.0 1359-00140245
CABS 51 GJ 194 A PMSC 05093+4553AB uvby98 100034029
CCABS 42 HD 34029 PPM 47925 VVO 236
CCDM J05168+4559AP H 0513+45 RAFGL 713 WDS J05167+4600Aa,Ab
CEL 586 HIC 24608 2RE J051640+455955 WDS J05167+4600A
Ci 20 321 HIP 24608 2RE J0516+455 WEB 4762
CSI+45 1077 1 HR 1708 RE J051640+455929 YPAC 23
CSI+45-05130 IDS 05093+4554 AP RE J0516+455 [FS2003] 0255
CSV 100460 IRAS 05130+4556 RX J0516.7+4559 [HFE83] 366
1E 051259+4556.7 IRC +50139 1RXS J051642.2+460001 AAVSO 0509+45
2E 0513.0+4556 JP11 1010 SAO 40186
2E 1239 LSPM J0516+4559 SBC7 214

References (1150 between 1850 and 2021) (Total 1150)
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


velocities : 20    distance : 1    Fe_H : 7    PLX : 3    PM : 3    MK : 2   

   

Observing logs


ISO : 2    IUE : 276    XMM : 13   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * alf Aur

Link by name to the catalogue in VizieR :

AG+45 512 BD+45 1077 CABS 51 CCDM J05168+4559AP CEL 586
2E 1239 EUVE J0516+45.9 FK5 193 GJ 194 GJ 194 B
GJ 194 A HD 34029 HIC 24608 HIP 24608 HR 1708
IRAS 05130+4556 IRC +50139 LSPM J0516+4559 2MASS J05164138+4559525 NLTT 14766
NSV 1897 PLX 1187 PPM 47925 RAFGL 713 2RE J051640+455955
2RE J0516+455 1RXS J051642.2+460001 SAO 40186 TD1 4244 TYC 3358-3141-1
USNO-B1.0 1359-00140245 uvby98 100034029 WDS J05167+4600Aa,Ab WDS J05167+4600A

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2021.07.29-23:34:07

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