Hubble space telescope snapshot survey for resolved companions of galactic cepheids: final results
Author
dc.contributor.author
Evans, Nancy Remage
Author
dc.contributor.author
Günter, H. Moritz
Author
dc.contributor.author
Bond, Howard E.
Author
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Schaefer, Gail H.
Author
dc.contributor.author
Mason, Brian D.
Author
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Karovska, Margarita
Author
dc.contributor.author
Tingle, Evan
Author
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Wolk, Scott
Author
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Engle, Scott
Author
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Guinan, Edward
Author
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Pillitteri, Ignazio
Author
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Proffitt, Charles
Author
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Kervella, Pierre
Author
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Gallenne, Alexandre
Author
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Anderson, Richard I.
Author
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Moe, Maxwell
Admission date
dc.date.accessioned
2021-06-11T20:13:41Z
Available date
dc.date.available
2021-06-11T20:13:41Z
Publication date
dc.date.issued
2020
Cita de ítem
dc.identifier.citation
Astrophysical Journal 905:81 (34pp), 2020 December 10
es_ES
Identifier
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10.3847/1538-4357/abc1f1
Identifier
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https://repositorio.uchile.cl/handle/2250/180102
Abstract
dc.description.abstract
Cepheids in multiple systems provide information on the outcome of the formation of massive stars. They can also
lead to exotic end-stage objects. This study concludes our survey of 70 galactic Cepheids using the Hubble Space
Telescope (HST) Wide Field Camera3 (WFC3) with images at two wavelengths to identify companions closer
than 5″. In the entire WFC3 survey we identify 16 probable companions for 13 Cepheids. The 7 Cepheids having
resolved candidate companions within 2″ all have the surprising property of themselves being spectroscopic
binaries (as compared with a 29% incidence of spectroscopic binaries in the general Cepheid population). This is a
strong suggestion that an inner binary is linked to the scenario of a third companion within a few
hundredastronomical units. This characteristic is continued for more widely separated companions. Under a
model where the outer companion is formed first, it is unlikely that it can anticipate a subsequent inner binary.
Rather, it is more likely that a triple system has undergone dynamical interaction, resulting in one star moving
outward to its current location. Chandra and Gaia data as well as radial velocities and HST/STIS and IUE spectra
are used to derive properties of the components of the Cepheid systems. The colors of the companion candidates
show a change in distribution at approximately 2000au separations, from a range including both hot and cool
colors for closer companions, to only low-mass companions for wider separations.
es_ES
Patrocinador
dc.description.sponsorship
National Aeronautics & Space Administration (NASA)
NAS 5-26555
17200363
Space Telescope Science Institute
GO-12215.01-A
GO-13368.01-A
National Aeronautics & Space Administration (NASA)
NAS8-03060
National Aeronautics and Space Administration through the Smithsonian Astrophysical Observatory
SV3-73016
National Aeronautics & Space Administration (NASA)
NAS803060
French National Research Agency (ANR)
ANR-15-CE31-0012-01
European Research Council (ERC)
695099