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The new Be-type star HD 147196 in the Rho Ophiuchi dark cloud regionThe newly discovered hot-emission line star, HD 147196 in the Rho Oph dark cloud region was observed spectroscopically and photometrically and high and low resolution IUE spectra were obtained. The finding of Irvine (1990) that this relatively bright star show its H-alpha-line in emission is confirmed. Previous H-alpha-surveys of the Rho Oph star-forming region did not detect HD 147196 as an H-alpha-emission star, meaning that it must recently be very active and has perhaps transformed itself from a B-type star at shell phase to a Be-phase. The Mg II h + k resonance lines are in absorption and they appear to be interstellar in nature, which means that either the abundance of Mg in the extended atmosphere of the star is low or that the shell is not extended enough to produce emission lines of Mg II. Photometric observations of this B8 V type star do not show any variations during at least the years covered by our monitoring or any excess of NIR radiation in its spectral energy distribution up to the M-passband at 4.8 microns.
Document ID
19940036369
Document Type
Reprint (Version printed in journal)
Authors
The, P. S. (Amsterdam Univ. Netherlands)
Perez, M. R. (IUE Observatory; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
De Winter, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Van Den Ancker, M. E. (Amsterdam Univ. Netherlands)
Date Acquired
August 16, 2013
Publication Date
March 1, 1993
Publication Information
Publication: Astronomy and Astrophysics
Volume: 269
Issue: 1-2
ISSN: 0004-6361
Subject Category
ASTROPHYSICS
Distribution Limits
Public
Copyright
Other