VLBA Determination of the Distance to Nearby Star-forming Regions. VIII. The LkH$\alpha$ 101 cluster
| Autor: | Dzib, S. A., Ortiz-León, G. N., Loinard, Laurent, Mioduszewski, A. J., Rodríguez, L. F., Medina, S. -N. X., Torres, R. M. |
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| Rok vydání: | 2018 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/1538-4357/aaa431 |
| Popis: | The LkH$\alpha$ 101 cluster takes its name from its more massive member, the LkH$\alpha$ 101star, which is an $\sim15$ M$_\odot$ star whose true nature is still unknown. The distance to the LkH$\alpha$ 101 cluster has been controversial for the last few decades, with estimated values ranging from 160 to 800 pc. We have observed members and candidate members of the LkH$\alpha$ 101 cluster with signs of magnetic activity, using the Very Long Baseline Array, in order to measure their trigonometric parallax and, thus, obtain a direct measurement of their distances. A young star member, LkH$\alpha$ 101 VLA J043001.15+351724.6, was detected at four epochs as a single radio source. The best fit to its displacement on the plane of the sky yields a distance of 535$\pm$29 pc. We argue that this is the distance to the LkH$\alpha$ 101 cluster. Comment: 6 pages, 3 figures and 2 tables. Accepted for publication in ApJ |
| Databáze: | arXiv |
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