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The Wind of the B[e] Supergiant Hen S22 Viewed through a Reflection Nebula in DEM L 106
Y. -H. Chu, C. -H. R. Chen, C. Danforth +5
Narrow-band HST WFPC2 images reveal a bow-shock-like halo around the HII region N30B toward the B[e] supergiant Hen S22 located within the larger DEM L 106 nebula in the Large Mage…
Far-Ultraviolet & Halpha Spectroscopy of SNR0057-7226 in the SMC HII Region N66
Charles Danforth, Ravi Sankrit, William Blair +2
N66/NGC346 is the largest and brightest HII region in the Small Magellanic Cloud and contains at least one known supernova remnant SNR0057-7226. Optical emission from the remnant i…
Structure and Dynamics of Candidate O Star Bubbles in N44
Yael Naze, You-Hua Chu, Martin A. Guerrero +3
Dynamical studies of superbubbles and Wolf-Rayet ring nebulae show discrepancies from the standard, adiabatic model for wind-blown bubbles. We therefore study the physical properti…
Ring Nebulae around Massive Stars throughout the HR Diagram
You-Hua Chu
Massive stars evolve across the HR diagram, losing mass along the way and forming a variety of ring nebulae. During the main sequence stage, the fast stellar wind sweeps up the amb…
Diffuse X-ray emission from the planetary nebula NGC 7009
Martin A. Guerrero, Robert A. Gruendl, You-Hua Chu
XMM-Newton EPIC observations of the planetary nebula (PN) NGC 7009, the Saturn Nebula, have detected extended X-ray emission in its central cavity. The diffuse X-ray emission must…
A Critical Examination of Hypernova Remnant Candidates in M101. II. NGC 5471B
C. -H. Rosie Chen, You-Hua Chu, Robert Gruendl +2
NGC 5471B has been suggested to contain a hypernova remnant because of its extraordinarily bright X-ray emission. To assess its true nature, we have obtained high-resolution images…
Narrow Lines in Type II Supernovae -- Probing the Circumstellar Nebulae of the Progenitors
Robert A. Gruendl, You-Hua Chu, Schuyler D. Van Dyk +1
We have carried out a high-dispersion (R~30,000) echelle spectroscopic survey of 16 Type II supernovae (SNe) to search for narrow emission lines from circumstellar nebulae ejected…