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Fig. 2

image

Hertzsprung-Russell diagram for the ρ-Oph Class II YSOs analyzed here. The continuous lines show the isochrones, while the dashed lines show the low-mass pre-main sequence evolutionary tracks. The upper panel is obtained using the tracks by Baraffe et al. (1998), while the bottom panel with tracks by D’Antona & Mazzitelli (1994). ISO numbers are reported for all the objects. Red lines represent the 1σ error on the parameters, while cyan lines the 3σ one. The objects ISOOph094 and ISOOph165 are classified as being subluminous probably due to an edge-on disk for the former and to a still partly optically thick envelope in the latter, which is a Class I target. The stellar parameters and the position on the HRD of ISOOph123 is very uncertain due to the very strong veiling due to accretion, which makes the spectral classification extremely difficult.

This figure is made of several images, please see below:

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