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

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Anatoly S. Miroshnichenko, Associate Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: 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 (λ 4481 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 = 60000. 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 ~ 21500 K), the metallicity [Fe/H]⨀ = - 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/L⨀) = 3.6 at a distance about 3 kpc.

Additional Information

Publication
V. G. Klochkova, M. V. Yushkin, A. S. Miroshnichenko, V. E. Panchuk, and K. S. Bjorkman (2002) A & AS. 392, 143-150. Discovery of spectral variation in the optical counterpart of IRAS 01005+7910.
Language: English
Date: 2002
Keywords
Stars: evolution, Stars: AGB and post-AGB, Stars: emission-line, Stars: individual: IRAS 01005+7910, Techniques: spectroscopic