2004A&A...426..213P


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET07:02:43

2004A&A...426..213P - Astronomy and Astrophysics, volume 426, 213-217 (2004/10-4)

Amplitude variations in the sdBV star PG 1605+072: Another beating time scale?

PEREIRA T.M.D. and LOPES I.P.

Abstract (from CDS):

object{PG 1605+072} has an unique and complex oscillation spectrum amongst the pulsating members of the EC 14026 stars. It has the longest periods and the richest, most puzzling frequency spectrum. We present a quantitative analysis of the photometric time-series obtained at 1-m telescope of the South African Astronomical Observatory. Thirteen oscillation parameters, frequencies, amplitudes and initial phases were determined from a 45h time-series. Our work confirm previous observational results. The observed frequencies are within a difference smaller than 2.7% of the theoretical values, and less than 0.1% of other previous studies. We also infer the existence of variation of a periodicity of 4-5 days on the amplitude of the observed modes, similar to the yearly time-scale variation found by previous studies. Furthermore, we found a new frequency of 2133µHz which has not been previously reported, its origin being yet unclear.

Abstract Copyright:

Journal keyword(s): stars: subdwarfs - stars: oscillations - stars: individual: PG 1605+072 - stars: horizontal branch

Simbad objects: 2

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Number of rows : 2

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 V* NY Vir HS* 13 38 48.1466489725 -02 01 49.209465866   13.43 13.66 13.75   sdB1VIIHe1 192 1
2 PG 1605+072 HS* 16 08 03.6872880396 +07 04 28.747599362   12.53 12.83 13.18   sdB0.2VIHe3 121 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-07:02:43

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