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The pulsating hot subdwarf Balloon 090100001: results of the 2005 multisite campaign | | A. Baran
; R. Oreiro
; A. Pigulski
; F. Perez Hernandez
; A. Ulla
; M. D. Reed
; C. Rodriguez-Lopez
; P. Moskalik
; S. L. Kim
; W. P. Chen
; R. Crowe
; M. Siwak
; L. Armendarez
; P. M. Binder
; K. J.Choo
; A. Dye
; J. R. Eggen
; R. Garrido
; J. M. Gonzalez Perez
; S. L. Harms
; F. Y. Huang
; D. Koziel
; H. T. Lee
; J. MacDonald
; L. Fox Machado
; T. Monserrat
; J. Stevick
; S. Stewart
; D. Terry
; A. Y. Zhou
; S. Zola
; | | Date: |
22 Oct 2008 | | Abstract: | We present the results of a multisite photometric campaign on the pulsating
sdB star Balloon 090100001. The star is one of the two known hybrid hot
subdwarfs with both long- and short-period oscillations. The campaign involved
eight telescopes with three obtaining UBVR data, four B-band data, and one
Stromgren uvby photometry. The campaign covered 48 nights, providing a temporal
resolution of 0.36microHz with a detection threshold of about 0.2mmag in
B-filter data.
Balloon 090100001 has the richest pulsation spectrum of any known pulsating
subdwarf B star and our analysis detected 114 frequencies including 97
independent and 17 combination ones. The strongest mode (f_1) in the 2.8mHz
region is most likely radial while the remaining ones in this region form two
nearly symmetric multiplets: a triplet and quintuplet, attributed to
rotationally split ell=1 and 2 modes, respectively. We find clear increases of
splitting in both multiplets between the 2004 and 2005 observing campaigns,
amounting to 15% on average. The observed splittings imply that the rotational
rate in Bal09 depends on stellar latitude and is the fastest on the equator. We
use a small grid of models to constrain the main mode (f_1), which most likely
represents the radial fundamental pulsation. The groups of p-mode frequencies
appear to lie in the vicinity of consecutive radial overtones, up to the third
one. Despite the large number of g-mode frequencies observed, we failed to
identify them, most likely because of the disruption of asymptotic behaviour by
mode trapping. The observed frequencies were not, however, fully exploited in
terms of seismic analysis which should be done in the future with a larger grid
of reliable evolutionary models of hot subdwarfs. | | Source: | arXiv, 0810.4010 | | Services: | Forum | Review | PDF | Favorites | |
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