Optical Spectrum of the Infrared Source IRAS 23304+6147

Details Optical Spectrum of the Infrared Source IRAS 23304+6147 Optical Spectrum of the Infrared Source IRAS 23304+6147

Feb 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000astl...26...88k&link_type=abstract

Astronomy Letters, vol. 26, p. 88-103 (2000)

Astronomy and Astrophysics

Astronomy

14

Scientific paper

Based on CCD spectra obtained with the PFES echelle spectrometer of the 6-m telescope, we have determined for the first time the effective temperature T_eff = 5900 K, surface gravity log g = 0.0, and detailed chemical composition of the faint star identified with the infrared source IRAS 23304+6147 by the model-atmosphere method. Its metallicity indicates that the object belongs to the old Galactic disk (the mean abundance of the iron-group elements V, Cr, and Fe for IRAS 23304+6147 is [X/H] = -0.61 dex). The stellar atmosphere exhibits an enhancement of carbon and nitrogen, [C/Fe] = +0.98, [N/Fe] = +1.36, and [C/O] > 1. Significant overabundances of lanthanides were detected: the mean [X/Fe] = +1.04 for La, Ce, Pr, Nd, and Eu. The elemental abundances suggest that the atmospheric chemical composition of IRAS 23304+6147 was modified mainly by nucleosynthesis followed by mixing. By modeling the object's spectrum, we revealed absorption features at the positions of well-known absorption diffuse interstellar bands (DIBs). An analysis of radial-velocity and intensity measurements for these DIBs leads us to conclude that, for IRAS 23304+6147, the DIBs originate mostly in its circumstellar dust envelope expanding at a velocity of about 20 km/s. Molecular C_2 Swan emission bands were detected in the object's spectrum, which also originate in the circumstellar envelope. There is a close match between the object's atmospheric effective temperatures determined independently by the model-atmosphere method and by modeling its optical and infrared energy distribution, within the accuracy of the methods.

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