Query : 2009A&A...494.1053R

2009A&A...494.1053R - Astronomy and Astrophysics, volume 494, 1053-1057 (2009/2-2)

Discovery of a rapidly pulsating subdwarf B star candidate in ω Centauri.


Abstract (from CDS):

We report the discovery of the first variable extreme horizontal branch star in a globular cluster (ω Cen). The oscillation uncovered has a period of 114s and an amplitude of 32mmag. A comparison between horizontal branch models and observed optical colours indicates an effective temperature of 31500±6300K for this star, placing it within the instability strip for rapidly oscillating B subdwarfs. The time scale and amplitude of the pulsation detected are also in line with what is expected for this type of variable, thus strengthening the case for the discovery of a new subdwarf B pulsator.

Abstract Copyright:

Journal keyword(s): stars: horizontal-branch - stars: subdwarfs - stars: oscillations - Galaxy: globular clusters: general

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3265 0
2 Balloon 90100001 HS* 23 15 21.4810390968 +29 05 01.433373360   11.90 12.30     sdB 83 0

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