VLBA determinations of the distances to nearby star-forming regions

Details VLBA determinations of the distances to nearby star-forming regions VLBA determinations of the distances to nearby star-forming regions

2008-04-07

arxiv.org/abs/0804.1069v1

Astronomy and Astrophysics

Astrophysics

4 pages, IAU248 meeting proceedings. The results on the Ophiuchus core were published in ApJ 675, L29, 2008

Scientific paper

10.1017/S1743921308018991

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

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