The optical spectrum of HR 4049 (includes a line identification from 3650 to 10850A).
Abstract
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=5.2x10^4^. These observations are supplemented with four high-resolution spectra of the NaI D1 & D2 and CaII K lines at R=~10^5^ (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^-7^Msun_/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_*_.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- February 1996
- DOI:
- 10.48550/arXiv.astro-ph/9509110
- arXiv:
- arXiv:astro-ph/9509110
- Bibcode:
- 1996A&A...306..924B
- Keywords:
-
- LINE IDENTIFICATION;
- LINE PROFILES;
- BINARIES: CLOSE;
- STARS: CHEMICALLY PECULIAR;
- STARS: HR 4049;
- STARS: AGB AND POST-AGB;
- Astrophysics
- E-Print:
- 21 pages plain latex file including 12 postscript figures, uses psfig.sty and rotate.sty