Query : 2017A&A...597A..95B

2017A&A...597A..95B - Astronomy and Astrophysics, volume 597A, 95-95 (2017/1-1)

EPIC 211779126: a rare hybrid pulsating subdwarf B star richly pulsating in both pressure and gravity modes.


Abstract (from CDS):

We present our analysis of EPIC 211779126, a pulsating subdwarf B star discovered with the Kepler spacecraft during K2 Campaign 5. We found 154 frequencies in the g-mode region as well as 29 frequencies in the p-mode region. This makes EPIC 211779126 a rare hybrid pulsator with a rich pulsation spectrum in both regions. We successfully identified modal degrees and relative radial orders of most of the g-modes using asymptotic period spacing, and modal degrees of some of the p-modes using rotational splitting. We detected trapped modes, which are a very important feature for constraining theoretical models. Our ground-based spectroscopic observations revealed no companion, therefore EPIC 211779126 is likely a single sdB star. Using p-mode multiplets, we derived a rotation period of approximately 16 days, making EPIC 211779126 the fastest rotating non-binary subdwarf B pulsator observed with Kepler. However, we do not find any resolved multiplets among the high-amplitude g-mode pulsations that correspond to the rotation rate inferred from the p-mode splittings. This may indicate that the star's core is rotating more slowly than its envelope.

Abstract Copyright: © ESO, 2017

Journal keyword(s): subdwarfs - stars: oscillations

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 GALEX J085649.3+170115 HS* 08 56 49.2697884816 +17 01 14.711098224     13.17     sdBHe2 14 0
2 2MASS J19033701+3836126 HS* 19 03 37.0267191120 +38 36 12.604186980           sdB 24 0
3 2MASS J19245816+4707536 HS* 19 24 58.1497315488 +47 07 53.672050236           sdB 35 0
4 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 85 0

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