2013A&A...555L...3G


Query : 2013A&A...555L...3G

2013A&A...555L...3G - Astronomy and Astrophysics, volume 555, L3-3 (2013/7-1)

Hot bottom burning and s-process nucleosynthesis in massive AGB stars at the beginning of the thermally-pulsing phase.

GARCIA-HERNANDEZ D.A., ZAMORA O., YAGUEE A., UTTENTHALER S., KARAKAS A.I., LUGARO M., VENTURA P. and LAMBERT D.L.

Abstract (from CDS):

We report the first spectroscopic identification of massive Galactic asymptotic giant branch (AGB) stars at the beginning of the thermal pulse (TP) phase. These stars are the most Li-rich massive AGBs found to date, super Li-rich AGBs with log ε (Li)∼3-4. The high Li overabundances are accompanied by weak or no s-process element (i.e. Rb and Zr) enhancements. A comparison of our observations with the most recent hot bottom burning (HBB) and s-process nucleosynthesis models confirms that HBB is strongly activated during the first TPs but the 22Ne neutron source needs many more TP and third dredge-up episodes to produce enough Rb at the stellar surface. We also show that the short-lived element Tc, usually used as an indicator of AGB genuineness, is not detected in massive AGBs, which is in agreement with the theoretical predictions when the 22Ne neutron source dominates the s-process nucleosynthesis.

Abstract Copyright:

Journal keyword(s): stars: AGB and post-AGB - stars: abundances - stars: evolution - nuclear reactions, nucleosynthesis, abundances - stars: atmospheres - stars: late-type

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* RU Ari OH* 02 44 45.4939002600 +12 19 03.001204056   16.01 14.39 12.75   M10 49 0
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6555 1
3 V* R Cen Mi* 14 16 34.3193427192 -59 54 49.294904112   9.65 7.55 4.45 1.37 M4-6e 133 0
4 V* R Nor Mi* 15 35 57.3532146231 -49 30 28.650984474   10.27 8.806 10.86   M3-7 74 0
5 V* S Her S* 16 51 53.9188877832 +14 56 30.763623732   9.69 6.40 7.03   M4-7.5Se 133 0
6 V* RU Cyg Mi* 21 40 39.0914354280 +54 19 28.954365060   9.14 7.29     M7II-III 106 0
7 V* SV Cas Mi* 23 39 01.4249385000 +52 15 44.861764932   9.79 8.54     M5 40 0
8 NAME Galactic Bulge reg ~ ~           ~ 4012 0

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2023.01.26-22:35:18

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