The Milky Way Cepheid Leavitt law based on Gaia DR2 parallaxes of companion stars and host open cluster populations

被引：62

作者：

Breuval, Louise ^{[1
]}

Kervella, Pierre ^{[1
]}

Anderson, Richard, I ^{[2
]}

Riess, Adam G. ^{[3
,4
]}

Arenou, Frederic ^{[5
]}

Trahin, Boris ^{[1
]}

Merand, Antoine ^{[2
]}

Gallenne, Alexandre ^{[6
,7
,8
,9
]}

Gieren, Wolfgang ^{[7
]}

Storm, Jesper ^{[10
]}

Bono, Giuseppe ^{[11
,12
]}

Pietrzynski, Grzegorz ^{[7
,8
]}

Nardetto, Nicolas ^{[6
]}

Javanmardi, Behnam ^{[1
]}

Hocde, Vincent ^{[6
]}

机构：

[1] Univ Paris Diderot, Sorbonne Univ, Univ PSL, LESIA,Observ Paris,Sorbonne Paris Cite, 5 Pl Jules Janssen, F-92195 Meudon, France

[2] European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany

[3] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA

[5] Univ PSL, Observ Paris, GEPI, CNRS, 5 Pl Jules Janssen, F-92190 Meudon, France

[6] Univ Cote dAzur, Observ Cote dAzur, CNRS, Lab Lagrange, Biot, France

[7] Univ Concepcion, Dept Astron, Casilla 160-C, Concepcion, Chile

[8] Polish Acad Sci, Nicolaus Copernicus Astron Ctr, Bartycka 18, PL-00716 Warsaw, Poland

[9] Univ Chile, Dept Astron, Unidad Mixta Int Franco Chilena Astron, CNRS UMI 3386, Camino El Observ 1515, Santiago, Chile

[10] Leibniz Inst Astrophys Potsdam AIP, Sternwarte 16, D-14482 Potsdam, Germany

[11] Univ Roma Tor Vergata, Dept Phys, Via Ric Sci 1, I-00133 Rome, Italy

[12] Ist Nazl Fis Nucl, Osservatorio Astron Roma, Via Frascati 33, I-00040 Monte Porzio Catone, Italy

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 643卷

基金：

欧洲研究理事会;

关键词：

parallaxes; stars: distances; stars: variables: Cepheids; distance scale; PERIOD-LUMINOSITY RELATIONS; LARGE-MAGELLANIC-CLOUD; RR LYRAE STARS; CHEMICAL-COMPOSITION; CLASSICAL CEPHEIDS; GALACTIC CEPHEIDS; GALAXY NGC-4258; BP CIR; CALIBRATION; PHOTOMETRY;

D O I：

10.1051/0004-6361/202038633

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Aims. Classical Cepheids provide the foundation for the empirical extragalactic distance ladder. Milky Way Cepheids are the only stars in this class accessible to trigonometric parallax measurements. However, the parallaxes of Cepheids from the second Gaia data release (GDR2) are affected by systematics because of the absence of chromaticity correction, and occasionally by saturation.Methods. As a proxy for the parallaxes of 36 Galactic Cepheids, we adopt either the GDR2 parallaxes of their spatially resolved companions or the GDR2 parallax of their host open cluster. This novel approach allows us to bypass the systematics on the GDR2 Cepheids parallaxes that is induced by saturation and variability. We adopt a GDR2 parallax zero-point (ZP) of -0.046 mas with an uncertainty of 0.015 mas that covers most of the recent estimates.Results. We present new Galactic calibrations of the Leavitt law in the V, J, H, K-S, and Wesenheit W-H bands. We compare our results with previous calibrations based on non-Gaia measurements and compute a revised value for the Hubble constant anchored to Milky Way Cepheids.Conclusions. From an initial Hubble constant of 76.18 +/- 2.37 km s(-1) Mpc(-1) based on parallax measurements without Gaia, we derive a revised value by adopting companion and average cluster parallaxes in place of direct Cepheid parallaxes, and we find H-0=72.8 +/- 1.9 (statistical + systematics) +/- 1.9 (ZP) km s(-1) Mpc(-1) when all Cepheids are considered and H-0=73.0 +/- 1.9 (statistical + systematics) +/- 1.9 (ZP) km s(-1) Mpc(-1) for fundamental mode pulsators only.

引用

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