The Distance to Rho-Ophiuchus

Details The Distance to Rho-Ophiuchus The Distance to Rho-Ophiuchus

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21114701t&link_type=abstract

American Astronomical Society, AAS Meeting #211, #147.01; Bulletin of the American Astronomical Society, Vol. 39, p.999

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Scientific paper

Using multi-epoch VLBA 3.6 cm observations, we have recently determined the trigonometric parallax of several young stars in Rho-Ophiuchus, and found that two sources associated with the sub-cloud Oph-A are at 120 +/- 5 pc, whereas two sources in the sub-cloud Oph-B are at 160 +/- 5 pc. The difference is significant, and our results suggest that Oph-A and Oph-B do not belong to the same star-forming complex; instead, they appear to be two distinct regions of star-formation, unrelated to one another, but projected in the same direction of the celestial sphere. This "resolves" a long-standing debate, as to whether Rho-Ophiuchus is at 120 or 160 pc: it is at both.

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