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HD 149934


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The nucleosynthesis of heavy elements in low-mass AGB stars
We take 13C(α,n)16O as neutron source, allowfor variation of the mass of the nucleus with thermal pulse number andadopt the unbranched s process path from 56Fe to210Bi in an attempt to explain the overabundance of heavyelements in MS and S stars. We found stars with larger masses havelarger dilution factors because of a stronger convection and that thesestars fall in four different regions in the abundance diagram, thusenabling a rough estimate of the mass to be made. We show that, for a2.5 Msolar star, the third dredge-up stops after a certain number ofpulses because of the formation of a hollow shell structure, so the starwill show no Tc and this can account for the existence of binary systemsconsisting of a ``Tc-no'' AGB star with a main-sequence star companion.

The heavy elements nucleosynthesis in the low mass AGB stars.
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Photoelectric observations of lunar occultations. X
Photoelectric occulation results for 461 events observed during 15months are reported. They include 77 reappearances, 4 determinations ofangular diameter, 38 analyses of double or multiple stars including twopreviously unknown bright stars, and 8 previously known bright double ormultiple stars.

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观测天体数据

星座:蛇夫座
右阿森松:16h38m34.74s
赤纬:-18°49'32.5"
视星:6.992
距离:213.22 天文距离
右阿森松适当运动:-10.6
赤纬适当运动:-12.9
B-T magnitude:8.892
V-T magnitude:7.149

目录:
适当名称   (Edit)
HD 1989HD 149934
TYCHO-2 2000TYC 6224-136-1
USNO-A2.0USNO-A2 0675-16164115
HIPHIP 81486

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