Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...334l..35b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 334, Nov. 1, 1988, p. L35-L40.
Astronomy and Astrophysics
Astronomy
10
Astronomical Spectroscopy, Pre-Main Sequence Stars, Radio Sources (Astronomy), Stellar Envelopes, Emission Spectra, Forbidden Transitions, H Alpha Line, Herbig-Haro Objects, Reflection Nebulae, Stellar Mass
Scientific paper
CCD optical spectra and interference filter images of the Galactic radio source G70.68 + 1.2 are presented. These data show it to consist of a bright, shock-excited emission shell surrounding an H-alpha emission star having properties like those observed in some pre-main-sequence stars. The emission shell's eastern rim closest to this star is dominated by a reflection nebula. The optical spectra of the shell, and of two faint emission knots located 20 arcsec to the southwest, show relative line intensities similar to those seen in Herbig-Haro objects. Based on these optical data along with published infrared and radio data, it is found that G70.68 + 1.2 is not a young SNR or compact H II region as has been proposed, but instead, it is suggested that it is a massive pre-main-sequence star having associated optical nebulosity and an exceptionally strong radio flux.
Becker Robert H.
Fesen Robert A.
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