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HST-STIS spectroscopy of the Bubble Nebula, NGC 7635

Published online by Cambridge University Press:  25 May 2016

Brent Buckalew ,
Reginald J. Dufour ,
Parviz Ghavamian ,
Patrick Hartigan ,
Don K. Walter ,
Jeff J. Hester  and
Paul A. Scowen
Brent Buckalew
Affiliation:
Rice University, Houston, TX 77005, USA
Reginald J. Dufour
Affiliation:
Rice University, Houston, TX 77005, USA
Parviz Ghavamian
Affiliation:
Rice University, Houston, TX 77005, USA
Patrick Hartigan
Affiliation:
Rice University, Houston, TX 77005, USA
Don K. Walter
Affiliation:
South Carolina State University, Orangeburg, SC 29117, USA
Jeff J. Hester
Affiliation:
Arizona State University, Tempe, AZ 85287-1504, USA
Paul A. Scowen
Affiliation:
Arizona State University, Tempe, AZ 85287-1504, USA

Abstract

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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.

Type
Part 3. Interaction of Wolf-Rayet stars and other hot massive stars with their environment: colliding winds and ring nebulae
Information
Symposium - International Astronomical Union , Volume 193: Wolf-Rayet Phenomena in Massive Stars and Starburst Galaxies , 1999 , pp. 336 - 337
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

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