68,813 research outputs found

    Produção de mudas de pupunheira (Bactris gasipaes H.B.K.).

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    Procedimentos para producao de mudas de pupunha de melhor qualidade, em menor tempo e com custo reduzido. Sao descritos os principais passos: selecao das matrizes, colheita dos frutos e preparo das sementes, pre-germinacao, plantio em sementeiras, preparo do substrato, repicagem, adubacao e tratos culturais.bitstream/CPAA-2009-09/2317/1/Com_Tec_11.pd

    The Snapshot Hubble U-Band Cluster Survey (SHUCS) II. Star Cluster Population of NGC 2997

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    We study the star cluster population of NGC 2997, a giant spiral galaxy located at 9.5 Mpc and targeted by the Snapshot Hubble U-band Cluster Survey (SHUCS). Combining our U-band imaging from SHUCS with archival BVI imaging from HST, we select a high confidence sample of clusters in the circumnuclear ring and disk through a combination of automatic detection procedures and visual inspection. The cluster luminosity functions in all four filters can be approximated by power-laws with indices of −1.7-1.7 to −2.3-2.3. Some deviations from pure power-law shape are observed, hinting at the presence of a high-mass truncation in the cluster mass function. However, upon inspection of the cluster mass function, we find it is consistent with a pure power-law of index −2.2±0.2-2.2\pm0.2 despite a slight bend at ∼\sim2.5×1042.5\times10^{4} M⊙_{\odot}. No statistically significant truncation is observed. From the cluster age distributions, we find a low rate of disruption (ζ∼−0.1\zeta\sim-0.1) in both the disk and circumnuclear ring. Finally, we estimate the cluster formation efficiency (Γ\Gamma) over the last 100 Myr in each region, finding 7±27\pm2% for the disk, 12±412\pm4% for the circumnuclear ring, and 10±310\pm3% for the entire UBVI footprint. This study highlights the need for wide-field UBVI coverage of galaxies to study cluster populations in detail, though a small sample of clusters can provide significant insight into the characteristics of the population.Comment: 31 pages, 9 figures, accepted to the A
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