Astronomy & Astrophysics

Table 1: Chandra X-ray sources with 2MASS counterpart in the vicinity of LkH $\alpha$ 312 and their X-ray count rates on October 18, 2000.
Table 2: ROSAT/HRI observation of LkH $\alpha$ 312 from September 5 to October 5, 1997.
Table 3: Optical and available near-infrared data for the emission line stars discussed in this article. See corresponding J-H, $H-K_{\rm S}$ diagram in Fig. 5, spectral energy distributions in Fig. 4, and H.-R. diagram in Fig. 3.
Table 4: Best fit parameters of the time-dependent spectroscopy with their errors at the 90% confidence levels ( $\Delta \chi ^2$ =2.71; corresponding to $\sigma =1.64$ for Gaussian statistics). $\eta \equiv \log{(L_{\rm X,intr}/L_{\rm bol})}$ .