Optical spectrum of HR 4049 (Bakker+, 1996)

Details Optical spectrum of HR 4049 (Bakker+, 1996) Optical spectrum of HR 4049 (Bakker+, 1996)

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ycat..33060924b&link_type=abstract

VizieR On-line Data Catalog: J/A+A/306/924. Originally published in: 1996A&A...306..924B

Computer Science

Line Profiles, Spectra: Infrared

Scientific paper

High-resolution optical spectra (UES/WHT) of the extreme metal-poor post-AGB star HR 4049 were obtained at four different orbital phases. The spectra cover the wavelength region from 3650A to 10850A at a resolution of R=5.2x104. These observations are supplemented with four high-resolution spectra of the NaI D1 & D2 and CaII K lines at R=~105 (CAT/CES). The optical spectrum shows 217 spectral lines: the Balmer series (Hα - H35), the Paschen series (P9 - P23), NI, OI and numerous CI lines. We show that the lines of Hα, Hβ, Hγ and NaI D show significant changes in profile between different observation dates. Nine components were identified in the profile of the NaI D lines of which three are circumstellar and six interstellar. The stronger CI lines are asymmetric and we derive a post-AGB mass-loss of ˙(M)=6+/-4x10-7M&sun;/yr from the asymmetry. The [OI]6300A line has been detected in emission at the system velocity and we argue that the emission is from an almost edge-on disk with a radius of about 20R*. HR 4049 is at J2000 position: 00 42 45.8 - 20 21 36 (1 data file).

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