S. Mazuk, C. C. Venturini, R. J. Rudy, D. K. Lynch, The Aerospace Corporation; R. C. Puetter, Center for Astrophysics and Space Sciences, University of California at San Diego; and R. B. Perry, NASA Langley Research Center, report 0.8-2.5 micron spectroscopy of the nova V4741 Sgr using the Lick Observatory 3-meter telescope and Aerospace Corporation Near-Infrared Imaging Spectrograph on July 19.29 UT (about 95 days after discovery): "He I at 1.0830 micron is the strongest emission line in the spectrum and the H I Paschen and Brackett series are prominent. O I lines excited by Lyman-beta fluorescence are still present although He II lines are starting to appear. The emission lines are broad (FWHM ranging from 2600-3600 km/s) and have peculiar, flat topped profiles. No coronal lines are detected. The relative strengths of the He I and H I lines suggest that helium abundance is enhanced relative to the solar value."
International Astronomical Union Circular
- Pub Date:
- August 2002