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HST-STIS spectroscopy of the Bubble Nebula, NGC 7635

  • Brent Buckalew (a1), Reginald J. Dufour (a1), Parviz Ghavamian (a1), Patrick Hartigan (a1), Don K. Walter (a2), Jeff J. Hester (a3) and Paul A. Scowen (a3)...

Abstract

We report the results of long-slit spectroscopy of the wind-blown bubble and photo-evaporating knots around the O6.5IIIf star BD+60°2522 made with the HST-Space Telescope Imaging Spectrograph. The Of star is the primary ionizing source for the H II region NGC 7635, located in the Perseus Arm. The spectra were taken through a 0″.2 x 52″ slit with low and medium resolution gratings covering the wavelength range 2900-6870 Å. Observations with two slit orientations were made; one across the line of embedded knots to the west of the Of star and the second running from the Of star across the bubble to the NE.

The 2D-STIS spectra permit us to subtract the surrounding H II region's diffuse emission from that of the knots and the bubble, and to study the spatial variations in various emission lines in these features to a resolution of ∼ 0″.2, an order of magnitude improvement over the best ground-based spectra of this object in the literature. We present high spatial-resolution emission-line and line-ratio profiles across the bubble and knots, and compare them with the predicted variations from photo-ionization, photo-evaporation, and wind-shock models. We also present an analysis of temperatures, densities, and abundances in the features from higher S/N spectra extracted over selected lengths of the slit.

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Copyright

References

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Talent, D.L., Dufour, R.J. 1979, ApJ 233, 888
Shaver, P.A., McGee, R.X., Newton, L.M., Danks, A.C., Pottasch, S.R. 1983, MNRAS 204, 53
Christopoulou, P.E., Goudis, C.D., Meaburn, J., Dyson, J.E., Clayton, C.A. 1995, A&A 295, 509.

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