VLBA determinations of the distances to nearby star-forming regions - AstrophysicsReport as inadecuate




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Abstract: Using phase-referenced multi-epoch Very Long Baseline Array observations, wehave measured the trigonometric parallax of several young stars in the Taurusand Ophiuchus star-forming regions with unprecedented accuracy. The meandistance to the Taurus complex was found to be about 140 pc, and its deptharound 20 pc, comparable to the linear extent of Taurus on the plane of thesky. In Ophiuchus, 4 sources were observed so far. Two of them were found to beat about 160 pc the distance traditionally attributed to Ophiuchus, while theother 2 are at about 120 pc. Since the entire Ophiuchus complex is only a fewparsecs across, this difference is unlikely to reflect the depth of the region.Instead, we argue that two physically unrelated sites of star-formation arelocated along the line of sight toward Ophiuchus.



Author: Laurent Loinard CRyA-UNAM, Rosa M. Torres CRyA-UNAM, Amy J. Mioduszewski NRAO, Luis F. Rodriguez CRyA-UNAM

Source: https://arxiv.org/







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