SIMBAD references

2001A&A...380..198M - Astronomy and Astrophysics, volume 380, 198-211 (2001/12-2)

Stellar and circumstellar evolution of long period variable stars.

MENNESSIER M.O. and LURI X.

Abstract (from CDS):

In a first paper, HIPPARCOS astrometric and kinematic data were used to calibrate both infrared K and IRAS luminosities at the same time as kinematic parameters of Long Period Variable stars (LPVs). Individual estimated absolute magnitudes and a probabilistic assignation to galactic populations were deduced from these calibrations for each LPV of our sample. Here we propose a scenario of simultaneous stellar and circumstellar evolution according to the galactic populations. The transitory states of S and Tc stars allow us to confirm the location of the first dredge-up at Mbol=-3.5. There is also evidence suggesting that a previous enrichment in s-elements from a more evolved companion may accelerate the evolution along the AGB. The possible evolution to OH LPVs is included in this scenario, and any of these stars may have a mass at the limit of the capability for a C enrichment up to C/O>1. A list of bright massive LPVs with peculiar envelope and luminosity properties is proposed as Hot Bottom Burning candidates. The He-shell flash star, R Cen, is found to be exceptionally bright and could become, before leaving the AGB, a C-rich LPV brighter than the usual luminosity limit of carbon stars.

Abstract Copyright:

Journal keyword(s): stars: variable: general - stars: evolution - stars: AGB and post-AGB

Status at CDS:  

Simbad objects: 64

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2020.04.09-16:16:16

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