SIMBAD references

2018ApJ...859..140C - Astrophys. J., 859, 140-140 (2018/June-1)

Optical-mid-infrared period-luminosity relations for W UMa)-type contact binaries based on Gaia DR 1: 8% distance accuracy.


Abstract (from CDS):

W Ursa Majoris (W UMa)-type contact binary systems (CBs) are useful statistical distance indicators because of their large numbers. Here, we establish (orbital) period-luminosity relations (PLRs) in 12 optical to mid-infrared bands (GBVRIJHKsW1W2W3W4) based on 183 nearby W UMa-type CBs with accurate Tycho-Gaia parallaxes. The 1σ dispersion of the PLRs decreases from optical to near- and mid-infrared wavelengths. The minimum scatter, 0.16 mag, implies that W UMa-type CBs can be used to recover distances to 7% precision. Applying our newly determined PLRs to 19 open clusters containing W UMa-type CBs demonstrates that the PLR and open cluster CB distance scales are mutually consistent to within 1%. Adopting our PLRs as secondary distance indicators, we compiled a catalog of 55,603 CB candidates, of which 80% have distance estimates based on a combination of optical, near-infrared, and mid-infrared photometry. Using Fourier decomposition, 27,318 high-probability W UMa-type CBs were selected. The resulting 8% distance accuracy implies that our sample encompasses the largest number of objects with accurate distances within a local volume with a radius of 3 kpc available to date. The distribution of W UMa-type CBs in the Galaxy suggests that in different environments, the CB luminosity function may be different: larger numbers of brighter (longer-period) W UMa-type CBs are found in younger environments.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): binaries: eclipsing - distance scale - stars: distances

VizieR on-line data: <Available at CDS (J/ApJ/859/140): table1.dat table4.dat>

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 19

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