RUNAWAY DWARF CARBON STARS AS CANDIDATE SUPERNOVA EJECTA

ABSTRACT The dwarf carbon (dC) star SDSS J112801.67+004034.6 has an unusually high radial velocity, 531 4 km s−1. We present proper motion and new spectroscopic observations which imply a large Galactic rest frame velocity, 425 9 km s−1. Several other SDSS dC stars are also inferred to have very hig...

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Bibliographic Details
Published in:The Astrophysical journal 2016-12, Vol.833 (2), p.232
Main Authors: Plant, Kathryn A., Margon, Bruce, Guhathakurta, Puragra, Cunningham, Emily C., Toloba, Elisa, Munn, Jeffrey A.
Format: Article
Language:English
Subjects:
Angular momentum
Angular velocity
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Binary stars
CARBON
CARBON STARS
Companion stars
Disruption
DWARF STARS
Ejecta
MASS TRANSFER
MILKY WAY
ORBITAL ANGULAR MOMENTUM
PHOTOSPHERE
PROPER MOTION
RADIAL VELOCITY
STAR EVOLUTION
stars: carbon
stars: kinematics and dynamics
Supernova
SUPERNOVAE
supernovae: general
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Summary:ABSTRACT The dwarf carbon (dC) star SDSS J112801.67+004034.6 has an unusually high radial velocity, 531 4 km s−1. We present proper motion and new spectroscopic observations which imply a large Galactic rest frame velocity, 425 9 km s−1. Several other SDSS dC stars are also inferred to have very high galactocentric velocities, again each based on both high heliocentric radial velocity and also confidently detected proper motions. Extreme velocities and the presence of C2 bands in the spectra of dwarf stars are both rare. Passage near the Galactic center can accelerate stars to such extreme velocities, but the large orbital angular momentum of SDSS J1128 precludes this explanation. Ejection from a supernova in a binary system or disruption of a binary by other stars are possibilities, particularly as dC stars are thought to obtain their photospheric C2 via mass transfer from an evolved companion.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/833/2/232