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  1. No Access

    Chapter

    The Lyα Forest Toward PKS 0405-123

    We present results from ∼ 7 km s-1 resolution STIS spectra for the bright, low-z QSO PKS 0405-123 (z = 0.574, V = 14.9), as part of a STIS Investigation Definition Team (IDT) key project to determine the physical...

    G. M. Williger, S. R. Heap, R. J. Weymann, R. Davé… in The IGM/Galaxy Connection (2003)

  2. No Access

    Chapter and Conference Paper

    Imaging and Spectroscopy of Hot (Young) “Ultracool” Companions

    We report the initial results from a program of HST/STIS spectroscopy of “hot” low-mass (brown dwarf) companions to nearby young stars identified in our HST/NICMOS coronagraphic imaging survey. We present spec...

    G. Schneider, P.J. Lowrance, E.E. Becklin, J.D. Kirkpatrick, P. Plait… in Ultracool Dwarfs (2001)

  3. No Access

    Chapter and Conference Paper

    Observations of Cspn

    It’s a good thing that we’re starting to meet every four years rather than every five. There has been tremendous progress in understanding the properties and evolution of central stars of planetary nebulae (CS...

    S. R. Heap in Planetary Nebulae (1997)

  4. No Access

    Chapter and Conference Paper

    High-Resolution CCD Imagery of NGC 6537 and NGC 7027

    Using Hα and Hβ images obtained at the CFHT, we derived the spatially varying reddening within NGC 6537 and NGC 7027. We then corrected the observed Hβ picture for dust extinction to obtain pictures more in ac...

    S. R. Heap in Planetary Nebulae (1993)

  5. No Access

    Chapter and Conference Paper

    A Search for Optical-Uv Fading of Central Stars

    We derive estimates of the masses of planetary nebulae central stars (CSPN), based on their rate of optical-UV fading.

    B. Altner, S. R. Heap in Planetary Nebulae (1993)

  6. No Access

    Chapter and Conference Paper

    Spectroscopic Properties of the Nucleus of NGC 6826

    We continue the trend of finding discrepancies in the values of central star masses derived from photospheric line profile fitting and other methods in our analyses of ground-based and UV spectra of the nucleu...

    B. Altner, S. R. Heap, I. Hubeny in Planetary Nebulae (1993)

  7. No Access

    Chapter and Conference Paper

    NGC 7027: New 7.8 – 20.0 μm Array Camera and Hα/Hβ CCD Image Analysis of Dust, PAH and Ionized GAS Distribution

    Infrared array camera images of the planetary nebula NGC7027 at seven wavelenghts between 7.8 and 20µm taken at the IRTF telescope are compared to Hα and Hβ images obtained at the CFHT, and published 2-, 6-, and ...

    D. Y. Gezari, M. D. Thornley, S. R. Heap, S. N. Shore, F. Varosi… in Planetary Nebulae (1993)

  8. No Access

    Article

    Ultraviolet detection of the nucleus of NGC2440

    In a recent letter, Atherton et al.1 announced the detection of the central, exciting star of the planetary nebula, NGC2440, on a narrow-band charge-coupled device (CCD) image obtained under excellent seeing cond...

    S. R. Heap in Nature (1987)

  9. No Access

    Article

    IUE observations of hot stars: HZ43, BD + 75°325, NGC6826, SS Cygni, η Carinae

    During the commissioning phase of IUE observations were made of a selection of hot stars: the white dwarf HZ43, the hot subdwarf BD + 75°325, the nucleus of the planetary nebula NGC6826, the dwarf nova SS Cygn...

    S. R. Heap, A. Boggess, A. Holm, D. A. Klinglesmith, W. Sparks, D. West, C. C. Wu… in Nature (1978)

  10. No Access

    Article

    In-flight performance of the IUE

    After the IUE's successful launch into an eccentric geosynchronous orbit, and following initial spacecraft checkout, observations were made of a set of high priority targets as an insurance against premature f...

    A. Boggess, R. C. Bohlin, D. C. Evans, H. R. Freeman, T. R. Gull, S. R. Heap… in Nature (1978)