Atomic jet from SMM1 (FIRS1) in Serpens uncovers non-coeval binary companion

We report on the detection of an atomic jet associated with the protostellar source SMM1 (FIRS1) in Serpens. The jet is revealed in [FeII] and [NeII] line maps observed with Spitzer/IRS, and further confirmed in HiRes IRAC and MIPS images. It is traced very close to SMM1 and peaks at ~5 arcsec" from the source at a position angle of $\sim 125 degrees. In contrast, molecular hydrogen emission becomes prominent at distances > 5" from the protostar and extends at a position angle of 160 degrees. The morphological differences suggest that the atomic emission arises from a companion source, lying in the foreground of the envelope surrounding the embedded protostar SMM1. In addition the molecular and atomic Spitzer maps disentangle the large scale CO (3-2) emission observed in the region into two distinct bipolar outflows, giving further support to a proto-binary source setup. Analysis at the peaks of the [FeII] jet show that emission arises from warm and dense gas (T ~1000 K, n(electron) 10^5 - 10^6 cm^-3). The mass flux of the jet derived independently for the [FeII] and [NeII] lines is 10^7 M(sun)/yr, pointing to a more evolved Class~I/II protostar as the driving source. All existing evidence converge to the conclusion that SMM1 is a non-coeval proto-binary source.Comment: 10 pages, 7 figures, 1 table. Accepted for publication in Astronomy \& Astrophysic

BRS 206.

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BRS 182.

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Efeito da adubação nitrogenada, arranjo de plantas e redutor de crescimento no acamamento e em características de cevada.

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BRS 181.

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Efeito da disposição da orientação de cultivo, do pareamento, de doses de nitrogênio e do uso de regulador de crescimento em características de cevada.

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Efeito da densidade de plantas e espaçamento entre linhas no desempenho de cultivares de milho da Embrapa.

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Desempenho de híbridos simples e triplos de milho cultivados em diferentes espaçamentos entre linhas e densidades de plantas.

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Caracterização de cinco linhagens de soja em Aral Moreira, MS, safra 1998/99.

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