J/A+A/450/1149 Radial velocity curve of Balloon 090100001 (Telting+, 2006)
Time-resolved spectroscopy of the bright sdBV Balloon 090100001.
Telting J.H., Ostensen R.H.
<Astron. Astrophys. 450, 1149 (2006)>
=2006A&A...450.1149T 2006A&A...450.1149T
ADC_Keywords: Stars, subdwarf ; Stars, B-type ; Radial velocities
Keywords: stars: subdwarfs - line: profiles - stars: early-type, oscillations -
stars: individual: Balloon 090100001
Abstract:
We have obtained 2552 useful low-resolution spectra of the bright sdBV
Balloon 090100001, which form the first large time-resolved
spectroscopic dataset of this brightest known pulsating subdwarf B
star. The data were obtained at the Nordic Optical Telescope during 7
nights in August/September 2004 over a total time base of 38 nights,
aiming to derive pulsational characteristics of this star. In this
paper we present the observations and the results obtained from
frequency analyses. In our data we find clear evidence for 8
independent frequencies, that were all previously reported in
photometric monitoring studies, allowing future asteroseismological
studies of this star to be constrained by combined photometric and
spectroscopic observations of as much as 8 pulsation modes. We do not
find conclusive evidence for new frequencies. We present the first
determination of the pulsational radial-velocity amplitudes of this
star, and find that the radial-velocity amplitude of the main
pulsation mode (f1=2.80749mHz) in Balloon 090100001 is 18.9km/s,
which is the largest radial-velocity amplitude found in sdB-star
pulsations so far.
Description:
Table 8: Radial velocities (undetrended) in km/s of all 2552 spectra
with respect to that of the mean spectrum, as obtained from
cross-correlation. See the article text for the radial velocity of the
mean spectrum. HJD is given in seconds with respect to HJD=2453241.0
Objects:
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RA (2000) DE Designation(s)
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23 15 21.5 +29 05 01 Balloon 90100001 = TYC 2248-1751-1
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table8.dat 24 2552 Radial velocities
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Spectrum number
6- 15 F10.2 s HJDs HJD in seconds with respect to HJD=2453241.0
17- 24 F8.4 km/s RV Radial velocity
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Acknowledgements: John Telting, jht(at)not.iac.es
(End) John Telting [Nordic Optical Telescope], P. Vannier [CDS] 26-Jan-2006