A Method for Quantitative Detection of Hot Horizontal Branches in Early-Type Galaxies

Details A Method for Quantitative Detection of Hot Horizontal Branches in Early-Type Galaxies A Method for Quantitative Detection of Hot Horizontal Branches in Early-Type Galaxies

Oct 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...415l..91w&link_type=abstract

Astrophysical Journal Letters v.415, p.L91

Astronomy and Astrophysics

Astronomy

18

Galaxies: Elliptical And Lenticular, Cd, Galaxies: Stellar Content, Stars: Horizontal-Branch, Stars: Evolution

Scientific paper

Surface brightness fluctuation magnitudes in the 2800-4000 A region are calculated. They show that a hot main sequence can be easily distinguished from a hot horizontal branch due to the relative sensitivity of fluctuation magnitudes to the presence of giants. Superluminous post-asymptotic giant branch (PAGB) stars will need to be subtracted before applying this method, and other hypothesized late- stage, hot stars may also contribute to the surface brightness fluctuation magnitudes, complicating the analysis. Application of this method further in the UV will provide an estimate of the luminosity of the next most luminous subpopulation of stars after the PAGB stars, which will constrain the possible populations responsible for the UV flux in ellipticals.

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