Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..265h&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 265-276. Research supported by NASA and NSERC.
Astronomy and Astrophysics
Astronomy
178
F Stars, G Stars, Infrared Radiation, Planetary Nebulae, Supergiant Stars, Asymptotic Giant Branch Stars, Emission Spectra, Infrared Astronomy Satellite, Spectral Energy Distribution, Stellar Envelopes, Stellar Evolution
Scientific paper
Ground-based observations have been obtained for eight F and G supergiant-like stars showing large IR excesses. The combination of ground-based and IRAS data shows that these objects have dual-peak energy distributions, with comparable amounts of energy emitted in the visible and the IR. The IR-emitting cool dust shells are likely to represent the remnants of ejecta from an earlier phase of evolution. It is suggested that these eight objects are similar to IRAS 18095 + 2704 and are intermediate-mass stars in a post-AGB phase of evolution. Model fittings to the 0.4-100 micron energy distribution of these objects suggest that they left the AGB within the last 1000 yr.
Hrivnak Bruce J.
Kwok Sun
Volk Kevin M.
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