Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...139..296s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 139, no. 2, Oct. 1984, p. 296-304.
Astronomy and Astrophysics
Astrophysics
52
Stellar Mass Ejection, Stellar Spectra, Symbiotic Stars, Distance, Stellar Envelopes, Stellar Evolution, Stellar Luminosity, Stellar Mass
Scientific paper
Coudé observations of high spectral and high spatial resolution of the [N II] and [O III] emission lines from HM Sge obtained at various position angles of the spectrograph entrance slit are presented. They reveal bipolar mass flow (≈200 km s-1) collimated into two narrow lobes separated by 1arcsec.5, two low-velocity features of 0arcsec.2 separation within the equatorial plane compatible with slowly expanding (≈25 km s-1) blobs or a rotating (≈10 km s-1) ring, and a shell of about 0arcsec.5 diameter expanding at an intermediate velocity (≈60 km s-1). A distance of ≈400 pc is inferred from the expansion rate of the nebula. The geometric and kinematical structure of HM Sge seems less compatible with a single-star model for symbiotic stars, but is found in excellent agreement with the model of a binary consisting of a mass-losing M-type giant and a compact companion accreting part of the mass from the giant through an accretion disk.
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