High resolution spectroscopy of the post-red supergiant IRC+10420. I. The data

Details High resolution spectroscopy of the post-red supergiant IRC+10420. I. The data High resolution spectroscopy of the post-red supergiant IRC+10420. I. The data

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26as..129..541o&link_type=abstract

Astronomy and Astrophysics Supplement, v.129, p.541-552

Astronomy and Astrophysics

Astrophysics

34

Stars: Circumstellar Matter, Stars: Emission-Line, Be, Stars: Individual: Irc+10420, Stars: Agb And Post-Agb, Stars: Supergiants

Scientific paper

A high resolution optical spectrum of the post-red supergiant candidate IRC+10420 is presented. The Utrecht Echelle Spectrograph observations, with a total integration time of more than 9 hours, provide a spectral coverage from 3850 Angstroms to 1 mu m, and a spectral resolution of 9 km s(-1) . The spectrum is shown, and an identification list of lines in the spectrum is provided. From a preliminary analysis of the spectrum we find that the spectral type of IRC+10420 has changed from F8I{(+}) in 1973 to mid- to early A type now, confirming the results of \cite[Oudmaijer et al. (1996)]{ou96}, who claimed a change in temperature based on photometric changes. It is shown that most of the emission lines in the spectrum of IRC+10420 are blue-shifted with respect to the systemic velocity traced by circumstellar rotational CO emission, while the (few) absorption lines - with the exception of some high excitation lines - are red-shifted by 25 km s(-1) , which may suggest infall of material onto the star. Finally, it is found that the interstellar extinction towards IRC+10420 , as traced by the Diffuse Interstellar Bands is very large, with an inferred E(B-V) of 1.4 +/- 0.5 compared to a total E(B-V) of 2.4. Table B1 is only available at the CDS via anonymous ftp 130.79.128.5 or at http://cdsweb.u-strasbg.fr/Abstract.html

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