The stellar upper mass limit in the solar neighborhood
J. Ma\'iz Apell\'aniz, Nolan R. Walborn, N. I. Morrell, E. P. Nelan,, V. S. Niemela, P. Benaglia, and A. Sota
TL;DR
This study uses high-resolution observations to investigate the maximum mass of stars in our neighborhood by searching for close companions that could affect mass estimates.
Contribution
It provides new observational data on the stellar upper mass limit by examining known massive stars for close companions using multiple instruments.
Findings
No close companions detected for Pismis 24 and HD 93129A.
Refined mass estimates for the studied stars.
Implications for the stellar upper mass limit.
Abstract
We are using HST GO programs 10205, 10602, and 10898 to test the stellar upper mass limit in the solar vicinity by attempting to detect optical close companions, thus lowering the calculated evolutionary masses. We have observed with ACS/HRC all the known (as of early 2005) Galactic O2/3/3.5 stars. We also have observations with HST/FGS and ground-based spectroscopy from LCO and CASLEO. Here we discuss our results for Pismis 24 and HD 93129A.
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astronomical Observations and Instrumentation