2012MNRAS.421..181R

Query : 2012MNRAS.421..181R

2012MNRAS.421..181R - Mon. Not. R. Astron. Soc., 421, 181-189 (2012/March-3)

Multiyear and multisite photometric campaigns on the bright high-amplitude pulsating subdwarf B star EC 01541-1409.

REED M.D., KILKENNY D., O'TOOLE S., OSTENSEN R.H., HONER C., GILKER J.T., QUINT A.C., DOENNIG A.M., HICKS L.H., THOMPSON M.A., McCART II P.A., ZIETSMAN E., CHEN W.-P., CHEN C.-W., LIN C.-C., BECK P., DEGROOTE P., BARLOW B.N., REICHART D.E., NYSEWANDER M.C., LACLUYZE A.P., IVARSEN K.M., HAISLIP J.B., BARAN A., WINIARSKI M. and DROZDZ M.

Abstract (from CDS):

We present follow-up observations of the pulsating subdwarf B (sdB) star EC 01541-1409 as part of our efforts to resolve pulsation spectra for use in asteroseismological analyses. This paper reports on data obtained from a single-site campaign, during 2008, and a multisite campaign, during 2009. From limited 2008 data, we were able to clearly resolve and pre-whiten 24 periods. A subsequent multisite campaign spanning nearly 2 months found over 30 individual periodicities most of which were unstable in amplitude and/or phase. Pulsation amplitudes were found to the detection limit, meaning that further observations would likely reveal more periodicities.

EC 01541-1409 reveals itself to be one of two sdB pulsators with many pulsation frequencies covering a large frequency range. Unlike the other star of this type (PG 0048+091), it has one high-amplitude periodicity which appears phase stable, making EC 01541-1409 an excellent candidate for exoplanet studies via pulsation phases. No multiplets were detected leaving EC 01541-1409 as yet another rich p-mode sdB pulsator without these features, limiting observational constraints on pulsation modes.


Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS

Journal keyword(s): stars: individual: EC 01541-1409 - stars: oscillations - subdwarfs - stars: variables: general

VizieR on-line data: <Available at CDS (J/MNRAS/421/181): table2.dat>

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 PG 0048+091 HS* 00 51 26.9371074840 +09 21 32.879383380   14.454 14.261 14.505   sdOB+F5V 37 0
2 GD 1053 HS* 01 56 31.8993527208 -13 54 26.457259860   12.2   12.63 12.40 sdOB 25 0
3 PG 1219+534 HS* 12 21 29.0914917288 +53 04 36.796062144   12.41       sdB 90 1
4 V* NY Vir HS* 13 38 48.1466908176 -02 01 49.207286748   13.43 13.66 13.75   sdB1VIIHe1 237 1
5 KPD 1930+2752 HS* 19 32 14.8088063952 +27 58 35.445679608 12.80 13.75 13.82     sdB 167 0

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