Query : 2004A&A...419..685T

2004A&A...419..685T - Astronomy and Astrophysics, volume 419, 685-693 (2004/5-4)

Radial-velocity and line-profile variations in the sdBV star PG 1325+101.


Abstract (from CDS):

In this paper we present time-series low-resolution spectroscopy of the pulsating sdB star PG1325+101, obtained with the Nordic Optical Telescope. We have cross-correlated the spectra and Fourier analysed the variations in radial velocity and the width of the cross-correlation function. From both resulting periodograms we easily recover the known main pulsation period. Further analysis of the spectra, after binning them in phase according to the pulsation period, clearly shows evidence for line-profile variations consistent with a radial pulsation mode. The variations show up in all Balmer and several helium lines sampled by the spectra, and can be understood in terms of temperature, gravity and radial-velocity variations. To the best of our knowledge PG 1325+101 is the faintest object in which line-profile variations due to pulsational instability have been detected so far.

Abstract Copyright:

Journal keyword(s): stars: subdwarfs - line: profiles - stars: early-type - stars: oscillations - stars: variables: general - stars: individual: PG 1325+101

Simbad objects: 3

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Number of rows : 3
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 V* EO Cet HS* 01 23 43.2471248112 -05 05 45.831024564   12.21 12.65     sdOV+F4V 60 0
2 PG 1325+102 HS* 13 27 48.5600155368 +09 54 51.049107756   13.73 13.98 14.29   sdBO 54 1
3 PG 1605+072 HS* 16 08 03.6872637792 +07 04 28.748468964   12.53 12.83 13.18   sdB0.2VIHe3 125 0

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