SIMBAD references

2017ApJ...841L...2H - Astrophys. J., 841, L2-L2 (2017/May-3)

Evidence from K2 for rapid rotation in the descendant of an intermediate-mass star.

HERMES J.J., KAWALER S.D., ROMERO A.D., KEPLER S.O., TREMBLAY P.-E., BELL K.J., DUNLAP B.H., MONTGOMERY M.H., GANSICKE B.T., CLEMENS J.C., DENNIHY E. and REDFIELD S.

Abstract (from CDS):

Using patterns in the oscillation frequencies of a white dwarf observed by K2, we have measured the fastest rotation rate (1.13 ± 0.02 hr) of any isolated pulsating white dwarf known to date. Balmer-line fits to follow-up spectroscopy from the SOAR telescope show that the star (SDSSJ0837+1856, EPIC 211914185) is a 13,590±340 K, 0.87 ± 0.03 M white dwarf. This is the highest mass measured for any pulsating white dwarf with known rotation, suggesting a possible link between high mass and fast rotation. If it is the product of single-star evolution, its progenitor was a roughly 4.0 M main-sequence B star; we know very little about the angular momentum evolution of such intermediate-mass stars. We explore the possibility that this rapidly rotating white dwarf is the byproduct of a binary merger, which we conclude is unlikely given the pulsation periods observed.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): stars: individual: EPIC 211914185 - stars: oscillations - stars: rotation - white dwarfs - white dwarfs

Simbad objects: 30

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2020.09.23-19:01:39

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