SIMBAD references

2016ApJ...826..201D - Astrophys. J., 826, 201-201 (2016/August-1)

VLBA determination of the distance to nearby star-forming regions. VII. Monoceros R2.

DZIB S.A., ORTIZ-LEON G.N., LOINARD L., MIODUSZEWSKI A.J., RODRIGUEZ L.F., TORRES R.M. and DELLER A.

Abstract (from CDS):

We present a series of 16 Very Long Baseline Array high angular resolution observations of a cluster of suspected low-mass young stars in the Monoceros R2 region. Four compact and highly variable radio sources are detected; three of them in only one epoch, the fourth one a total of seven times. This latter source is seen in the direction of the previously known UC H ii region VLA 1, and has radio properties that resemble those of magnetically active stars; we shall call it VLA 1*. We model its displacement on the celestial sphere as a combination of proper motion and trigonometric parallax. The fit obtained using a uniform proper motion yields a parallax p=1.10±0.18 mas, but with a fairly high post-fit dispersion. If acceleration terms (probably due to an undetected companion) are included, the quality of the fit improves dramatically, and the best estimate of the parallax becomes p=1.12±0.05 mas. The magnitude of the fitted acceleration suggests an orbital period of the order of a decade. The measured parallax corresponds to a distance d= {893}_{-40}^{+44} pc , in very good agreement with previous, indirect determinations.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrometry - radiation mechanisms: non-thermal - radio continuum: stars - techniques: interferometric

Simbad objects: 22

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2019.12.12-09:01:24

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