2014A&A...563A..79R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:51:32

2014A&A...563A..79R - Astronomy and Astrophysics, volume 563A, 79-79 (2014/3-1)

Mode identification based on time-series spectrophotometry for the bright rapid sdB pulsator EC 01541-1409.

RANDALL S.K., FONTAINE G., GEIER S., VAN GROOTEL V. and BRASSARD P.

Abstract (from CDS):

We present an analysis of time-resolved spectrophotometry gathered with FORS/VLT for the rapidly pulsating hot B subdwarf EC 01541-1409 with the aim of identifying the degree index l of the larger amplitude modes. This mode identification can be extremely useful in detailed searches for viable asteroseismic models in parameter space, and can be crucial for testing the validity of a solution a posteriori. To achieve it, we exploit the l-dependence of the monochromatic amplitude, phase, and velocity-to-amplitude ratio of a mode as a function of wavelength. We use the l-sensitive phase lag between the flux perturbation and the radial velocity as an additional diagnostic tool. On this basis, we are able to unambiguously identify the dominant 140.5s pulsation of our target as a radial mode, and the second-highest amplitude periodicity at 145.8s as an l=2 mode. We further exploit the exceptionally high-sensitivity data that we gathered for the dominant mode to infer modal properties that are usually quite difficult to estimate in sdB pulsators, namely the physical values of the dimensionless radius, temperature, and surface gravity perturbations.

Abstract Copyright:

Journal keyword(s): asteroseismology - techniques: imaging spectroscopy - stars: oscillations - stars: individual: EC 01541-1409 - stars: variables: general - stars: atmospheres

Simbad objects: 7

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Number of rows : 7

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 GD 1053 HS* 01 56 31.9005661793 -13 54 26.450104966   12.2   12.63 12.40 sdOB 13 0
2 BD-14 362 * 01 56 34.2729829573 -13 52 51.563733238   11.472 10.991     ~ 2 0
3 PG 1325+102 HS* 13 27 48.5602550889 +09 54 51.048576366   13.73 13.98 14.29   sdBO 52 1
4 BPS CS 22880-0018 HS* 20 36 41.3094027770 -19 15 00.323581868 14.26 15.34 15.60     sdB 15 0
5 KPD 2109+4401 HS* 21 11 47.6446188582 +44 13 50.621291301 12.14 13.11 13.30 13.64   sdB 62 0
6 V* V391 Peg HS* 22 04 12.1044101613 +26 25 07.820507559   14.41 14.61 15.00   sdB 99 2
7 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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2020.07.04-14:51:32

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