Bibcode
Badenes, C.; Mazzola, Christine; Thompson, Todd A.; Covey, Kevin; Freeman, Peter E.; Walker, Matthew G.; Moe, Maxwell; Troup, Nicholas; Nidever, David; Allende Prieto, C.; Andrews, Brett; Barbá, Rodolfo H.; Beers, Timothy C.; Bovy, Jo; Carlberg, Joleen K.; De Lee, Nathan; Johnson, Jennifer; Lewis, Hannah; Majewski, Steven R.; Pinsonneault, Marc; Sobeck, Jennifer; Stassun, Keivan G.; Stringfellow, Guy S.; Zasowski, Gail
Bibliographical reference
The Astrophysical Journal, Volume 854, Issue 2, article id. 147, 12 pp. (2018).
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2
2018
Journal
Citations
126
Refereed citations
112
Description
We use the multi-epoch radial velocities acquired by the Apache Point
Observatory Galactic Evolution Experiment (APOGEE) survey to perform a
large-scale statistical study of stellar multiplicity for field stars in
the Milky Way, spanning the evolutionary phases between the main
sequence (MS) and the red clump. We show that the distribution of
maximum radial velocity shifts (ΔRVmax) for APOGEE
targets is a strong function of log g, with MS stars showing
ΔRVmax as high as ∼300 {km} {{{s}}}-1,
and steadily dropping down to ∼30 {km} {{{s}}}-1 for log
g ∼ 0, as stars climb up the red giant branch (RGB). Red clump stars
show a distribution of ΔRVmax values comparable to that
of stars at the tip of the RGB, implying they have similar multiplicity
characteristics. The observed attrition of high ΔRVmax
systems in the RGB is consistent with a lognormal period distribution in
the MS and a multiplicity fraction of 0.35, which is truncated at an
increasing period as stars become physically larger and undergo mass
transfer after Roche Lobe overflow during H-shell burning. The
ΔRVmax distributions also show that the multiplicity
characteristics of field stars are metallicity-dependent, with
metal-poor ([Fe/H] ≲ ‑0.5) stars having a multiplicity
fraction a factor of 2–3 higher than metal-rich ([Fe/H] ≳
0.0) stars. This has profound implications for the formation rates of
interacting binaries observed by astronomical transient surveys and
gravitational wave detectors, as well as the habitability of
circumbinary planets.
Related projects
Chemical Abundances in Stars
Stellar spectroscopy allows us to determine the properties and chemical compositions of stars. From this information for stars of different ages in the Milky Way, it is possible to reconstruct the chemical evolution of the Galaxy, as well as the origin of the elements heavier than boron, created mainly in stellar interiors. It is also possible to
Carlos
Allende Prieto