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- W2056576241 abstract "view Abstract Citations (6) References (47) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS 1420 and 408 MHz Observations of the Planetary Nebula BD+30(degree)3639 and AFGL 618 Likkel, Lauren ; Taylor, A. R. ; Gussie, G. T. ; Dewdney, P. E. Abstract 1420 MHz spectral line and continuum observations as well as 408 MHz continuum observations have been made toward the compact planetary nebulae BD + 30 deg 3639 and AFGL 618 with the Synthesis Telescope of the Dominion Radio Astrophysical Observatory. These observations were intended to detect possible circumnebular H I in AFGL 618 and to detect an anticipated extended component of the previously detected circumstellar H I of BD + 30 deg 3639. Neither the planetary nebula AFGL 618 nor the bipolar nebula M1-92 were detected by 1420 or 408 MHz continuum observations, or by 1420 MHz spectroscopic observations. The anticipated extended H I of BD + 30 deg 3639 was not detected, indicating that the H I distribution of this nebula is significantly more compact than that of the planetary nebula IC 418. Compact, dense planetary nebulae such as BD + 30 deg 3639 may have circumnebular envelopes that are primarily molecular rather than atomic. Publication: The Astronomical Journal Pub Date: February 1992 DOI: 10.1086/116080 Bibcode: 1992AJ....103..538L Keywords: H I Regions; Planetary Nebulae; Radio Astronomy; Astronomical Spectroscopy; Circular Polarization; Interstellar Chemistry; Stellar Envelopes; Ultrahigh Frequencies; Astrophysics; PLANETARY NEBULA: INDIVIDUAL: BD; 30(DEGREE)3639 AND AFGL 618; RADIO LINES: MOLECULAR: CIRCUMSTELLAR full text sources ADS | data products SIMBAD (3)" @default.
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- W2056576241 date "1992-02-01" @default.
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- W2056576241 title "1420 and 408 MHz observations of the planetary nebulae BD + 30 deg 3639 and AFGL 618" @default.
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