HST Imaging of Central Stars of High Excitation Planetary Nebulae with WFC and WFPC2

Details HST Imaging of Central Stars of High Excitation Planetary Nebulae with WFC and WFPC2 HST Imaging of Central Stars of High Excitation Planetary Nebulae with WFC and WFPC2

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19511014w&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #110.14; Bulletin of the American Astronomical Society, Vol. 31, p.1538

Astronomy and Astrophysics

Astronomy

Scientific paper

We present observations of the central stars of four high excitation planetary nebulae (IC 2165, Me 2-1, NGC 2440, NGC 7027) taken with the Wide Field Camera and the Wide Field Planetary Camera 2 on board the Hubble Space Telescope. For each of these stars, most of the flux is in the ultraviolet resulting in low visual brightness against a background of high nebular surface brightness. As a result even the detection of these objects is difficult and determinations of the visual magnitude of the central stars have been very divergent. The high angular resolution of the HST instruments and the choice of filters, including several ultraviolet bandpasses, has provided reliable magnitudes and, for the first time, direct determination of the amount of dust extinction present along the respective lines of sight. We find EB-V values of 0.40 (IC 2165), 0.15 (Me 2-1), 0.15 (NGC 2440), and 1.10 (NGC 7027). We also determine V (and B, not listed here) magnitudes for the four central stars of 17.47+/-0.06 (IC 2165), 18.40+/-0.05 (Me 2-1), 17.63+/-0.16 (NGC 2440), and 16.04+/-0.04 (NGC 7027). The advantage of using narrow band or medium bandwidth filters in the V region as well as the gain from higher spatial resolution is illustrated by comparison with ground-based and HST measurements made with V (or very similar) filter bandpasses (e.g., Ciardullo et al. 1999, AJ, 118, 488). This research was supported by NASA Grant NAG5-1611 ``Extension of Wide Field Planetary Camera: Post-Launch Science and Engineering Activities.''

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