2015A&A...579A.107C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:31:33

2015A&A...579A.107C - Astronomy and Astrophysics, volume 579A, 107-107 (2015/7-1)

Theoretical impact of fast rotation on calibrating the surface brightness-color relation for early-type stars.

CHALLOUF M., NARDETTO N., DOMICIANO DE SOUZA A., MOURARD D., AROUI H., STEE P., DELAA O., GRACZYK D., PIETRZYNSKI G. and GIEREN W.

Abstract (from CDS):

The eclipsing binary method for determining distance in the local group is based on the surface brightness-color relation (SBCR), and early-type stars are preferred targets because of their intrinsic brightness. However, this type of star exhibits wind, mass-loss, pulsation, and rotation, which may generate bias on the angular diameter determination. An accurate calibration of the SBCR relation thus requires careful analysis. In this paper we aim to quantify the impact of stellar rotation on the SBCR when the calibration of the relation is based on interferometric measurements of angular diameters. Six stars with V-K color indices ranging between -1 and 0.5 were modeled using the code for high angular resolution of rotating objects in nature (CHARRON) with various rotational velocities (0, 25, 50, 75, and 95% of the critical rotational velocity) and inclination (0, 25, 50, 75, and 90 degrees). All these models have their equatorial axis aligned in an east-west orientation in the sky. We then simulated interferometric observations of these theoretical stars using three representative sets of the CHARA baseline configurations. The simulated data were then interpreted as if the stars were non-rotating to determine an angular diameter and estimate the surface-brightness relation. The V-K color of the rotating star was calculated directly from the CHARRON code. This provides an estimate of the intrinsic dispersion of the SBCR relation when the rotation effects of flattening and gravity darkening are not considered in the analysis of interferometric data. We find a clear relation between the rotational velocity and (1) the shift in zero point (Δa0) of the SBCR (compared to the static relation) and (2) its dispersion (σ). When considering stars rotating at less than 50% of their critical velocity, Δa0 and σ have about 0.01mag, while these quantities can reach 0.08 and 0.04mag, respectively, when the rotation is larger than 75% of the critical velocity. Besides this, the inclination angle mostly has an impact on the V-K color: i<50° (resp. i>50°) makes the star redder (resp. bluer). When considering the 150 models, Δa0 and σ have 0.03 and 0.04mag, respectively. These values are slightly but not significantly modified (about 0.03 and 0.01mag in Δa0 and σ, respectively) when considering different CHARA configurations. Interestingly, these 150 models, regardless of the interferometric configuration, are consistent with the empirical SBCR, which is within its dispersion of 0.16mag. In addition, if one only considers projected rotational velocity Vrotsini lower than 100km/s, then Δa0 and σ have 0.02 and 0.03mag, respectively. To calibrate the SBCR interferometrically at the 0.02mag precision (or lower), one should consider (1) a baseline configuration covering all directions of the (u, v) plan; (2) a sample of stars with rotational velocity lower than 50% of their critical velocity or, alternatively, stars with Vrotsini lower than 100km/s; (3) homogeneous visible and infrared photometry precisely at the 0.02mag level or lower.

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Journal keyword(s): techniques: interferometric - stars: distances - stars: rotation - instrumentation: interferometers - methods: numerical - stars: early-type

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 - 2020
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14826 1

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.07.03CEST21:31:34

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
NAME LMC -- Galaxy
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:
gam (2EG,3EG,...), G (Ref,2014AJ....147...13K,...), IR (IRAS)
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 23 34.6 -69 45 22 (Optical) [ ] D 2003A&A...412...45P
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 24 00.0 -69 48 00 [ ]
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) :
280.4652 -32.8884 [ ]
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)
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Proper motions mas/yr :
1.910 0.229 [0.020 0.047 ] C 2013ApJ...764..161K
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
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  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 262.2 [3.4] / z(spectroscopic) 0.000875 [0.000011] / cz 262.31 [3.40]
   C 2012AJ....144....4M
Syntax of morphological type is : mtype quality bibcode
  • mtype : Hubble morphological class (spirals, ellipticals, etc)
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Morphological type:
SB(s)m D 2013MNRAS.428.1927C
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin):
322.827 274.770 170 (Opt) D 2014MNRAS.445..881C
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
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Fluxes (1) :
V 0.4 [0.1] D 2012AJ....144....4M
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Identifiers (22) :
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NAME LMC ESO-LV 56-1150 2FHL J0526.6-6825e NAME Large Magellanic Cloud
Anon 0524-69 0FGL J0538.4-6856 3FHL J0530.0-6900e NAME Nubecula Major
2EG J0532-6914 1FGL J0538.9-6914 1FLE J0536-6856 [M98c] 052400.0-694800
3EG J0533-6916 2FGL J0526.6-6825e GLXY G279.0-34.4+262 [MI94] Sm 29
EGR J0537-6946 3FGL J0526.6-6825e IRAS 05240-6948
ESO 56-115 1FHL J0526.6-6825 LEDA 17223

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References (14826 between 1850 and 2020) (Total 14826)
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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distance : 4    velocities : 1    Fe_H : 1   

   

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ISO : 39    XMM : 2    herschel : 144   

   


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

Data at NED - NASA/IPAC Extragalactic Database : NAME LMC

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3EG J0533-6916 ESO-LV 56-1150 IRAS 05240-6948

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2020.07.03-21:31:34

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