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Constraining the star formation rate in the solar neighbourhood with star clusters

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Constraining the star formation rate in the solar neighbourhood with star clusters

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Título Constraining the star formation rate in the solar neighbourhood with star clusters
Autor Bonatto, Charles Jose
Bica, Eduardo Luiz Damiani
Abstract This paper investigates the star formation rate (SFR) in the solar neighbourhood. First, we build the local age distribution function (ADF) with an updated sample of 442 star clusters located at less than 1 kpc from the Sun. Next, we define the SFR, compute the individual mass evolution of a population of artificial clusters covering the broad range of parameters observed in actual clusters, and assume 100M as the low-mass limit for effective cluster observation. This leads to a simulated ADF, which is compared to the low-noise solar neighbourhood ADF. The best match corresponds to a non-constant SFR presenting two conspicuous excesses for ages ≤9Myr and between 220–600 Myr (the local starburst). The average SFR is SFR ≈ (2500 ± 500)M Myr−1, corresponding to the average surface SFR SFR ≈ (790 ± 160)M Myr−1 kpc−2. These values are consistent with the SFR inferred from embedded clusters (ECs), but much lower ( 16 per cent) than that implied by field stars. Both the local starburst and the recent star formation period require SFR ∼ 2 × SFR to be described. The simulations show that 91.2 ± 2.7 per cent of the clusters created in the solar neighbourhood do not survive the first 10 Myr, which is consistent with the rate of EC dissolution.
Contido em Monthly notices of the royal astronomical society. Oxford. Vol. 415, no. 3 (Aug 2011), p. 2827–2831
Assunto Aglomerados abertos e associações
Aglomerados estelares
Formacao de estrelas
[en] Open clusters and associations: general
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/93354
Arquivos Descrição Formato
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