2020A&A...639A..67N


Query : 2020A&A...639A..67N

2020A&A...639A..67N - Astronomy and Astrophysics, volume 639A, 67-67 (2020/7-1)

Calibrating the surface brightness - color relation for late-type red giants stars in the visible domain using VEGA/CHARA interferometric observations.

NARDETTO N., SALSI A., MOURARD D., HOCDE V., PERRAUT K., GALLENNE A., MERAND A., GRACZYK D., PIETRZYNSKI G., GIEREN W., KERVELLA P., LIGI R., MEILLAND A., MORAND F., STEE P., TALLON-BOSC I. and TEN BRUMMELAAR T.

Abstract (from CDS):


Context. The surface brightness - color relationship (SBCR) is a poweful tool for determining the angular diameter of stars from photometry. It was for instance used to derive the distance of eclipsing binaries in the Large Magellanic Cloud (LMC), which led to its distance determination with an accuracy of 1%.
Aims. We calibrate the SBCR for red giant stars in the 2.1≤V-K≤2.5 color range using homogeneous VEGA/CHARA interferometric data secured in the visible domain, and compare it to the relation based on infrared interferometric observations, which were used to derive the distance to the LMC.
Methods. Observations of eight G-K giants were obtained with the VEGA/CHARA instrument. The derived limb-darkened angular diameters were combined with a homogeneous set of infrared magnitudes in order to constrain the SBCR.
Results. The average precision we obtain on the limb-darkened angular diameters of the eight stars in our sample is 2.4%. For the four stars in common observed by both VEGA/CHARA and PIONIER/VLTI, we find a 1σ agreement for the angular diameters. The SBCR we obtain in the visible has a dispersion of 0.04 magnitude and is consistent with the one derived in the infrared (0.018 magnitude).
Conclusions. The consistency of the infrared and visible angular diameters and SBCR reinforces the result of 1% precision and accuracy recently achieved on the distance of the LMC using the eclipsing-binary technique. It also indicates that it is possible to combine interferometric observations at different wavelengths when the SBCR is calibrated.

Abstract Copyright: © N. Nardetto et al. 2020

Journal keyword(s): techniques: interferometry - stars: atmospheres - stars: distances - binaries: eclipsing - stars: late-type - stars: fundamental parameters

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 * 29 Psc V* 00 01 49.4481127032 -03 01 39.011820024 4.47 4.98 5.10     B7III-IV 212 0
2 HD 360 HB* 00 08 17.5324307736 -08 49 26.801843988   7.014 5.980     K1II 41 0
3 * 21 Cet PM* 00 54 17.5927919832 -08 44 26.390035212   7.086 6.161     G8III 75 0
4 * 28 Cet * 01 06 05.1486425280 -09 50 21.678755676   5.566 5.565     A0V 50 0
5 HD 11037 * 01 48 26.0194155048 +03 41 07.618785792   6.894 5.904     K0III 44 0
6 * 63 Cet HB* 02 11 35.8349680056 -01 49 31.536924240   6.903 5.933     K0III 44 0
7 HD 15633 PM* 02 30 45.2032450872 +00 15 20.706778080   6.169 5.990     A3V 32 0
8 * lam Cet * 02 59 42.8998715 +08 54 26.489871 4.13 4.58 4.70 4.72 4.70 B6III 95 0
9 HD 22798 PM* 03 39 38.3470730400 -03 23 34.820140164   7.261 6.219     K0III 23 0
10 * 24 Eri * 03 44 30.5105062824 -01 09 47.127478680 4.76 5.15 5.25     B7IV 74 0
11 HD 23526 PM* 03 46 09.3636693576 +06 48 12.688793676   6.896 5.922     G9III 31 0
12 HD 30034 PM* 04 44 25.8285113424 +11 08 46.083452208   5.638 5.379 5.230 5.082 F0V 112 0
13 * psi Eri * 05 01 26.3459959 -07 10 26.266203 3.87 4.62 4.81     B3IV 104 0
14 * 18 Ori * 05 16 04.1346616440 +11 20 28.878184140   5.500 5.515     A0V 62 0
15 * nu. Lep * 05 19 59.0231920080 -12 18 56.110551876 4.76 5.169 5.284     B7/8V 64 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16164 1
17 HD 40020 PM* 05 56 49.4497394952 +11 31 15.812064624   7.008 5.884     K2III 52 0
18 HD 43023 RG* 06 13 54.2339540784 -03 44 28.935892248   6.753 5.833     K0III 67 0
19 HD 43445 * 06 15 44.8862849424 -13 43 06.290644188   4.915 5.001     B9V 58 0
20 HD 46487 * 06 33 37.9213970040 -01 13 12.553237092   4.934 5.079     B5IV/V 77 0
21 HD 219402 * 23 15 34.2574251888 -03 29 46.962267252   5.61 5.55   5.49 A2V 39 0

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2022.08.16-18:41:05

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