HR 4049 - The hottest proto-planetary nebula star or a run-away hypergiant at high galactic latitude surrounded by a dust cloud?

Details HR 4049 - The hottest proto-planetary nebula star or a run-away hypergiant at high galactic latitude surrounded by a dust cloud? HR 4049 - The hottest proto-planetary nebula star or a run-away hypergiant at high galactic latitude surrounded by a dust cloud?

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154l..20l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. L20-L22. ZWO-supported research.

Astronomy and Astrophysics

Astrophysics

78

Cosmic Dust, Hot Stars, Planetary Nebulae, Spectral Energy Distribution, Stellar Evolution, Supergiant Stars, Emission Spectra, Infrared Spectra, Mira Variables, Spectrum Analysis, Stellar Envelopes, Stellar Mass, Ultraviolet Spectra, Variable Stars, Visible Spectrum

Scientific paper

The star HR 4049 has a visual spectrum which indicates that it is a B9.5 hypergiant at a surprisingly large distance above the galactic plane of Z = 1.3 kpc. It was discovered that the star is surrounded by a dust cloud of T = 1250 K, which produces a large IR excess and a severe UV deficiency. If the star is an extreme Pop. I hypergiant, it is the only known runaway hypergiant and the only one with such a large IR excess and UV deficiency. Alternatively, the star may be a less massive star of less than three solar masses, which is in transition between the Mira phase and a planetary nebula phase. The discovery of an emission feature at 11.3 microns, which is typical for planetary nebulae, supports this possibility.

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