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Investigating the Humphreys-Davidson limit for Galactic, LMC and SMC metallicities

Gautham Narayana Sabhahit (Armagh Observatory and Planetarium)

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Dec 17, 2020
from 04:00 PM to 04:15 PM

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The theoretical HD limit in metal-poor galaxies is generally expected to shift to higher luminosities owing to the physics of metallicity dependent line-driven winds. However, the observations in the Large and Small Magellanic Clouds suggest no such evidence of these winds as the primary factor in setting the HD limit. Recent studies show a downward revision of luminosities in the Galaxy as well, hinting towards a metallicity independent HD limit at about log(L) of 5.5. For this reason, we investigate the HD limit at three different metallicities using the MLT++ routine in MESA and study the impact of overshooting efficiency on our results.

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