Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986apj...311..882g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 311, Dec. 15, 1986, p. 882-894.
Astronomy and Astrophysics
Astrophysics
51
Astronomical Spectroscopy, Pre-Main Sequence Stars, Reflection Nebulae, Visible Spectrum, Charge Coupled Devices, Emission Spectra, Polarimetry, Radial Velocity
Scientific paper
A variety of optical observation techniques was used to study the IR source V645 Cyg. Kinematically, the nebula lies in the Cassiopeia-Perseus spiral arm, which exhibits a peculiar, noncircular velocity in this direction. Hence the nebula is at a distance of 3.5 kpc. The reddening of the nebula is 0.83, determined from the diffuse interstellar feature at 6614 A and confirmed by broad-band colors. Almost all of this reddening is interstellar. The spectral type of the observed shell spectrum is between A0 and A5. In addition, a long, linear 'beak' associated with the reflection nebula was found with deep CCD imaging. Spectrophotometry indicates that this feature is unusual in many respects, shining predominantly by reflection. Finally, an HH object was discovered in the southern part of the nebula, and evidence for a system of forbidden S II emission with a relative radial velocity of -244 km/sec is presented.
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