Physical parameters and ±0.2% parallax of the detached eclipsing binary V923 Scorpii

被引：6

作者：

Pribulla, T. ^{[1
]}

Merand, A. ^{[2
]}

Kervella, P. ^{[3
,4
]}

Cameron, C. ^{[5
,6
]}

Deen, C. ^{[7
,8
]}

Garcia, P. J. V. ^{[9
,10
]}

Horrobin, M. ^{[11
]}

Matthews, J. M. ^{[12
]}

Moffat, A. F. J. ^{[13
]}

Pfuhl, O. ^{[8
]}

Rucinski, S. M. ^{[14
]}

Straub, O. ^{[4
]}

Weiss, W. W. ^{[15
]}

机构：

[1] Slovak Acad Sci, Astron Inst, Tatranska Lomnica 05960, Slovakia

[2] European Southern Observ, Alonso De Cordova 3107,Casilla 19001, Santiago 19, Chile

[3] Univ Chile, Unidad Mixta Int Francochilena Astron, CNRS, Dept Astron,UMI 3386, Camino El Observ 1515, Santiago, Chile

[4] Univ Paris Diderot, PSL Res Univ, UPMC, CNRS,Observ Paris,LESIA,UMR 8109, 5 Pl Jules Janssen, F-92195 Meudon, France

[5] Cape Breton Univ, Dept Math Phys & Geol, 1250 Grand Lake Rd,B1P 6L2, Sydney, NS, Canada

[6] Canadian Coast Guard Coll, Dept Arts Sci & Languages, Sydney, NS B1R 2J6, Canada

[7] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[8] Max Planck Inst Extraterr Phys, Giessenbachstr, D-85748 Garching, Germany

[9] Univ Porto, Fac Engn, Rua Dr Roberto Frias, P-4200465 Porto, Portugal

[10] Univ Lisbon, IST, Ctr Astrofis & Gravitacao, CENTRA, P-1049001 Lisbon, Portugal

[11] Univ Cologne, Phys Inst, Zulpicher Str 77, D-50937 Cologne, Germany

[12] Univ British Columbia, Dept Phys & Astron, Vancouver, BC V6T 1Z1, Canada

[13] Univ Montreal, Dept Phys, CP 6128,Succursale Ctr Ville, Montreal, PQ H3C 3J7, Canada

[14] Univ Toronto, Dept Astron & Astrophys, 50 St George St, Toronto, ON M5S 3H4, Canada

[15] Univ Vienna, Inst Astron, Turkenschanzstr 17, A-1180 Vienna, Austria

来源：

ASTRONOMY & ASTROPHYSICS | 2018年 / 616卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

binaries: spectroscopic; binaries: eclipsing; stars: fundamental parameters; parallaxes; stars: distances; STARS; PHOTOMETRY; ISOCHRONES; SATELLITE; CATALOG; GAIA;

D O I：

10.1051/0004-6361/201730673

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. V923 Sco is a bright (V = 5.91), nearby (pi = 15.46 +/- 0.40 mas) southern eclipsing binary. Because both components are slow rotators, the minimum masses of the components are known with 0.2% precision from spectroscopy. The system seems ideal for very precise mass, radius, and luminosity determinations and, owing to its proximity and long orbital period (similar to 34.8 days), promises to be resolved with long-baseline interferometry. Aims. The principal aim is very accurate determinations of absolute stellar parameters for both components of the eclipsing binary and a model-independent determination of the distance. Methods. New high-precision photometry of both eclipses of V923 Sco with the MOST satellite was obtained. The system was spatially resolved with the VLTI AMBER, PIONIER, and GRAVITY instruments at nine epochs. Combining the projected size of the spectroscopic orbit (in km) and visual orbit (in mas) the distance to the system is derived. Simultaneous analysis of photometric, spectroscopic, and interferometric data was performed to obtain a robust determination of the absolute parameters. Results. Very precise absolute parameters of the components were derived in spite of the parameter correlations. The primary component is found to be overluminous for its mass. Combining spectroscopic and interferometric observations enabled us to determine the distance to V923 Sco with better than 0.2% precision, which provides a stringent test of Gaia parallaxes. Conclusions. It is shown that combining spectroscopic and interferometric observations of nearby eclipsing binaries can lead to extremely accurate parallaxes and stellar parameters.

引用

页数：9

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