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The Gould's Belt Distances Survey (GOBELINS) III. The distance to the Serpens/Aquila Molecular Complex

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arxiv 1610.03128 v1 pith:MQVBSCZ6 submitted 2016-10-10 astro-ph.SR astro-ph.GA

Gisela N. Ortiz-León , Sergio A. Dzib , Marina A. Kounkel , Laurent Loinard , Amy J. Mioduszewski , Luis F. Rodríguez , Rosa M. Torres , Gerardo Pech
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Juana L. Rivera Lee Hartmann Andrew F. Boden Neal J. Evans II Cesar Briceño John J. Tobin Phillip A. B. Galli
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keywords serpenscomplexdistancesdistancegobelinsaquilabeltgould
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abstract

We report on new distances and proper motions to seven stars across the Serpens/Aquila complex. The observations were obtained as part of the Gould's Belt Distances Survey (GOBELINS) project between September 2013 and April 2016 with the Very Long Baseline Array (VLBA). One of our targets is the proto-Herbig AeBe object EC 95, which is a binary system embedded in the Serpens Core. For this system, we combined the GOBELINS observations with previous VLBA data to cover a total period of ~8 years, and derive the orbital elements and an updated source distance. The individual distances to sources in the complex are fully consistent with each other, and the mean value corresponds to a distance of $436.0\pm9.2$~pc for the Serpens/W40 complex. Given this new evidence, we argue that Serpens Main, W40 and Serpens South are physically associated and form a single cloud structure.

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Cited by 1 Pith paper

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    The CH₃OH/CH₃CN ratio in the S68N outflow is constant at ~100-200 and matches gas-phase astrochemical models only when cosmic-ray ionization rates are raised to ~10^{-14} s^{-1}.

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