Open AccessPeriod and chemical evolution of SC stars
Author(s) -
Zijlstra Albert A.,
Bedding Timothy R.,
Markwick Andrew J.,
LoidlGautschy Rita,
Tabur Vello,
Alexander Kristen D.,
Jacob Andrew P.,
Kiss László L.,
Price Aaron,
Matsuura Mikako,
Mattei Janet A.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07927.x
Subject(s) - physics , astrophysics , stars , radius , stellar evolution , amplitude , spectral line , astronomy , effective temperature , computer security , computer science , quantum mechanics
The SC and CS stars are thermal‐pulsing asymptotic giant branch stars with a C/O ratio close to unity. Within this small group, the Mira variable BH Cru recently evolved from spectral type SC (showing ZrO bands) to CS (showing weak C 2 ). Wavelet analysis shows that the spectral evolution was accompanied by a dramatic period increase, from 420 to 540 d, indicating an expanding radius. The pulsation amplitude also increased. Old photographic plates are used to establish that the period before 1940 was around 490 d. Chemical models indicate that the spectral changes were caused by a decrease in stellar temperature, related to the increasing radius. There is no evidence for a change in C/O ratio. The evolution in BH Cru is unlikely to be related to an ongoing thermal pulse. Periods of the other SC and CS stars, including nine new periods, are determined. A second SC star, LX Cyg, also shows evidence for a large increase in period, and one further star shows a period inconsistent with a previous determination. Mira periods may be intrinsically unstable for C/O ≈ 1; possibly because of a feedback between the molecular opacities, pulsation amplitude, and period. LRS spectra of 6 SC stars suggest a feature at λ > 15 μm , which resembles one recently attributed to the iron‐sulphide troilite. Chemical models predict a large abundance of FeS in SC stars, in agreement with the proposed association.