Discovery of spectral variation in the optical counterpart of IRAS 01005+7910

Details Discovery of spectral variation in the optical counterpart of IRAS 01005+7910 Discovery of spectral variation in the optical counterpart of IRAS 01005+7910

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002a%26a...392..143k&link_type=abstract

Astronomy and Astrophysics, v.392, p.143-150 (2002)

Astronomy and Astrophysics

Astrophysics

15

Stars: Evolution, Stars: Agb And Post-Agb, Stars: Emission-Line, Stars: Individual: Iras 01005+7910 -, Lstrok, Inebreak Techniques: Spectroscopic

Scientific paper

We present a study of the high-resolution spectroscopic data for the proto-planetary nebula candidate IRAS 01005+7910. For the first time a careful spectral line identification is carried out, and a significant variability of the optical spectrum is detected. We found absorption lines of C II/III, N II, O II, Al III, Si III, and Mg II (lambda4481 Å), as well as emission lines of Si II and [Fe II]. Both absorption and emission components are present in the Balmer lines, Na I resonance D1,2 lines, He I, and Fe III lines. The He I line profiles vary from straight to inverse P Cyg-type on a timescale of days to months. The resonance Na I lines show 5 absorption components at a resolution of R=60 000. Additionally, the Na I D2 line exhibits a variable emission component with a width comparable to that of the Balmer line emission components. Using the model atmospheres method within the LTE-approximation, the effective temperature (Teff ~21 500 K), the metallicity [Fe/H]sun=-0.31, and the ratio C/O>1 is reported. Finally, we suggest that IRAS 01005+7910 is a carbon-rich post-AGB star with a luminosity log (L/Lsun)=3.6 at a distance about 3 kpc.

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