2017A&A...597A..95B


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.26CEST21:52:33

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.

BARAN A.S., REED M.D., OSTENSEN R.H., TELTING J.H. and JEFFERY C.S.

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

Status at CDS:  

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 GALEX J085649.3+170115 HS* 08 56 49.2700931456 +17 01 14.711622759     13.17     sdB 8 0
2 KIC 3527751 HS* 19 03 37.0267709781 +38 36 12.603014123           sdB 16 0
3 KIC 10139564 HS* 19 24 58.1495860117 +47 07 53.671623446           sdB 26 0
4 Balloon 90100001 HS* 23 15 21.4810383697 +29 05 01.429272894   11.90 12.30     sdB 74 0

    Equat.    Gal    SGal    Ecl

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2020.05.26-21:52:33

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