Unusual features of the 1-4 micron spectrum of HR 4049

Journal Article · Mon May 01 04:00:00 EDT 1989 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/185431· OSTI ID:5629579

Geballe, T R; Noll, K S; Whittet, D C.B.; Waters, L B.F.M.

Moderate resolution spectra from 1.05 to 3.65 microns of the post-AGN star HR 4049 show a number of features indicative of intense mass loss and unusual circumstellar chemistry. These are deep Brackett series absorption lines to rather high n states, emission in the 3.29 and 3.40 microns 'dust' features, and the rarely occurring emission features near 3.5 microns. HR 4049 is only the third star in which the 3.5micron features have been reported; the other two stars are premain-sequence objects. The physical and chemical conditions for the production of the (unknown) molecule responsible for this emission appear to be highly constrained. 25 refs.

• Research Organization: Joint Astronomy Center, Hilo, HI (USA); Arizona Univ., Tucson (USA); York Univ., Downsview (USA); Toronto Univ. (Canada); Amsterdam Universiteit (Netherlands)
• OSTI ID: 5629579
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 340; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHEMISTRY
COSMIC DUST
COSMOCHEMISTRY
DUSTS
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
GALAXY NUCLEI
INFRARED SPECTRA
MASS TRANSFER
MOLECULES
RADIATIONS
SPECTRA
SPECTROSCOPY
STARS
ULTRAVIOLET RADIATION