Astronomy & Astrophysics

All Tables

Table 1: Observing parameters for the molecular line data obtained with the SEST. $t_{\rm int}$ refers to the integration time, HPBW is the half-power beam-width, $\eta _{\rm mb}$ is the main beam efficiency, $T_{\rm sys}$ is the average system temperature, and $\sigma$ is the average rms noise per spectral channel for the observations.
Table 2: Properties of the spatially integrated profiles seen toward the condensations. These were obtained from Gaussian fits to the profiles shown in Fig. 4. The parameters include; the central velocity (V, km s^-1), peak temperature (T, K) and line-width ( $\Delta V$ , km s^-1).
Table 3: Physical parameters for the condensations derived from the properties given in Table 2. Listed are: the excitation temperature ( $^{12}T_{\rm ex}$ ) measured from the ¹²CO(2-1) peak temperature; the ratio of ¹²CO(2-1) and (1-0) integrated intensities (¹²R); the ratio of ¹³CO(2-1) and ¹²CO(2-1) integrated intensities (^12,13R); the ratio of CS(3-2) and CS(2-1) integrated intensities (^CSR); ¹³CO(2-1) optical depth ( $^{13}\tau$ ); ¹³CO(2-1) column density (N(¹³CO)); ${\rm H_{2}}$ column density (N( ${\rm H_{2}}$ )); mass estimated under LTE conditions ( $M_{\rm LTE}$ ); Virial mass estimate ( $M_{\rm virial}$ ) and the average ${\rm H_{2}}$ density (n( ${\rm H_{2}}$ )).
Table 4: The derived parameters of the two-component grey-body fits to the SEDs for G287.52-0.41, G287.84-0.82 G287.88-0.93 and G287.87-1.36 as shown in Fig. 7. The parameters correspond to the temperatures of the outer ( $T_{\rm {outer}}$ ) and inner ( $T_{\rm {inner}}$ ) dust components, the inner ( $R_{\rm {inner}}$ ) and outer ( $R_{\rm {outer}}$ ) radii of the dust shell and estimates of the gas mass ( $M_{\rm gas}$ ), Luminosity derived from these and the corresponding spectral types of the exciting star. The numbers in brackets next to the source names refer to the source label from Fig. 6.
Table 5: Coordinates for all sources discussed (taken from MSX data). Comment descriptions include: massive young stellar object candidate (MYSO); compact ${\rm H~{\scriptstyle {II}}}$ regions ( ${\rm H~{\scriptstyle {II}}}$ ); bright stellar object (S); tip of a filamentary feature (T); molecular condensation (MC); cluster (C); diffuse $K_{\rm s}$ -band emission (DE); red object in 2MASS images (R) and any additional nomenclature. The divisions in the table separate the MYSO, the compact ${\rm H~{\scriptstyle {II}}}$ regions, the sources that most likely correspond to evolved stars, the source displaying an extremely red colour in 2MASS images, and the molecular condensations. Fluxes for these sources are given in Rathborne (2003).