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Fig. 5


Latitude distribution of the HIP2 OB stars. The red curve is a non-parametric fit to the selected HIP2 sample, the red dashed curve shows the additional contribution of the Orion OB1 association, while the red dotted curve shows the added contributions of the Trumpler 10, Vela OB2, Collinder 121, and Lacerta OB1 associations. The blue curve and light-blue shaded area shows the average and 2σ confidence band of the simulated longitude distribution, based on 30 simulated instances of the sample. The black dotted and dash-dot curves show the relative contributions of the major spiral arms (Sagittarius-Carina and Perseus) and the local arm, respectively, while the additional black solid curve is for a model without a warp.

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