On the Infrared Properties of S-Stars with and Without Technetium

Details On the Infrared Properties of S-Stars with and Without Technetium On the Infrared Properties of S-Stars with and Without Technetium

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...271..180g&link_type=abstract

Astronomy and Astrophysics, Vol.271, NO. 1/APRI, P. 180, 1993

Astronomy and Astrophysics

Astrophysics

29

Circumstellar Matter, Stars-Evolution, Stars, Late Type

Scientific paper

There exist S-stars with and without technetium in their spectra. The S-stars with technetium are considered to be thermal pulsing AGB stars, while the S-stars without technetium are usually thought to be giants which acquired their s-process material from a (presently unseen white dwarf) companion. I investigate the possibility of discriminating between S-stars with ("intrinsic" S-stars) and without ("extrinsic" S-stars) technetium solely on the basis of their infrared properties. I find that intrinsic S-stars have a circumstellar envelope, while the infrared properties of extrinsic S-stars are consistent with (warm) stellar blackbodies with no or very little circumstellar material. This is reflected in the IRAS PSC fluxes, the LRS spectra and V-[12] colour of the intrinsic and extrinsic S-stars. I find that S-stars with S25>0.30S12 are intrinsic S-stars, stars with 0.255127.0 are intrinsic and all S-stars with V-[12]≤5.0 are extrinsic. S-stars with intermediate V-[12] colour can belong to both groups. The infrared properties of the intrinsic and extrinsic S-stars are consistent with the evolutionary phase envisioned for both groups. I estimate that between 50% and 70% of S-stars in an optically complete sample are extrinsic S-stars.

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