Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...327l..23t&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 327, April 1, 1988, p. L23-L26.
Astronomy and Astrophysics
Astrophysics
46
Carbon Monoxide, Carbon Stars, Nebulae, Stellar Evolution, Stellar Spectra, Asymmetry, Hydrocyanic Acid, Stellar Mass Ejection, Temporal Distribution
Scientific paper
It is found that the profiles of CO J = 1-0 at 2.6 mm observed in the cool carbon star V Hydrae show marked asymmetry and noticeable spatial variations, while the profiles of HCN J = 1-0 observed at the same time show no marked asymmetry. The two strong-velocity components in CO profile could be spatially resolved, indicating that the strong CO emission in V Hya originates in a region of bipolar geometry. The CO profiles also show temporal variation with time scale less than 1 yr, both in intensity and in shape, and such a time variation may indicate the importance of radiative excitation which can be time-dependent due to variability of the central star. Also, optical observations of V Hya can consistently be understood by a bipolar-disk model. Thus, V Hya may represent an early stage of the development of a bipolar nebula.
Cho Sungtae
Izumiura Hideyuki
Kaifu Norio
Koyama Katsuji
Tsuji Takashi
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