Seminars
 
ICCUB SEMINAR – Finding the double sunsets: close binary stars, large spectroscopic surveys
 
Location
DAM seminar room (724), 7th floor
Date
01/03/2018 - 01/03/2018
 
I will discuss our present knowledge of the statistics of stellar multiplicity (the multiplicity fraction and the distribution of periods, mass ratios, and eccentricities), and the implications for stellar evolution, in particular for Type Ia Supernovae (SN Ia).

I will describe how multi-epoch radial velocity measurements from large spectroscopic surveys can open a new observational window on stellar multiplicity, and present two case studies: white dwarfs in SDSS/SEGUE and the ESO SPY survey, and red giants in SDSS/APOGEE.

For the white dwarfs, we can measure their merger rate and evaluate their viability as Type Ia SN progenitors. For the red giants, we can explore the interplay between stellar evolution and stellar multiplicity, evaluate the rate of stellar mergers, and uncover a strong dependence of the multiplicity fraction with metallicity.

Contact email: secretariacientifica(a)icc.ub.edu
 
Attached Documents
Generalitat de CatalunyaUniversitat de BarcelonaUniversitat Autònoma de BarcelonaUniversitat Politècnica de CatalunyaConsejo Superior de Investigaciones CientíficasCentres de Recerca de Catalunya