Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072

Falter, S.; Heber, U.; Schuh, S.; Cordes, O.; Edelmann, H.

doi:10.1051/0004-6361:20030122

Cited by 20 publications

(35 citation statements)

References 28 publications

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“…As is the case for PG 1605-072 (see O'Toole et al 2000O'Toole et al , 2002O'Toole et al , 2005Woolf et al 2002;Falter et al 2003), it is possible that also in Balloon 090100001 some of the observed amplitudes may change over time.…”

Section: Radial-velocity Amplitudes From Sine Fitsmentioning

confidence: 90%

Time-resolved spectroscopy of the bright sdBV Balloon 090100001

Telting

Østensen

2006

A&A

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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 ( f 1 = 2.80749 mHz) in Balloon 090100001 is 18.9 km s −1 , which is the largest radial-velocity amplitude found in sdB-star pulsations so far. For all spectra, the radial velocities are published electronically.

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Section: Radial-velocity Amplitudes From Sine Fitsmentioning

confidence: 90%

Time-resolved spectroscopy of the bright sdBV Balloon 090100001

Telting

Østensen

2006

A&A

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“…In the spectroscopic studies, O'Toole et al (2002) has one of the longest time series and a very good frequency resolution, making it a good reference for frequency comparison. We have also compared our results with the latest photometric results, Falter et al (2003).…”

Section: Comparison With Previous Studiesmentioning

confidence: 97%

“…Since its discovery by Koen et al (1998), there have been several studies, photometric (Kilkenny et al 1999;Falter et al 2003) and spectroscopic (O'Toole et al 2000(O'Toole et al , 2002Woolf et al 2002;Falter et al 2003). So far, the reference study and the major photometric campaign has been Kilkenny et al (1999).…”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…Despite having a relatively large amplitude (around 11 mmag), the 2133 µHz mode was not found in any of the other studies, implying that this is a new observed frequency, or possibly a result from some kind of artefact. (Koen et al 1998;Kilkenny et al 1999;Falter et al 2003). The mmi units of Kilkenny et al (1999) …”

Section: Comparison With Previous Studiesmentioning

confidence: 99%

“…In the past, PG 1605+072 has been observed many times (Koen et al 1998;Kilkenny et al 1999;O'Toole et al 2000O'Toole et al , 2002Woolf et al 2002;Falter et al 2003), using either photometry (pulsations produce luminosity variations) or spectroscopy (shifts in line indices). Our work is another photometric monitoring of the variation of frequencies and amplitudes for PG 1605+072.…”

Section: Introductionmentioning

confidence: 99%

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

Pereira¹,

Lopes

2004

A&A

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Abstract. 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 45 h 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 2133 µHz which has not been previously reported, its origin being yet unclear.

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High-Speed Optical Spectroscopy

Marsh¹

High Time Resolution Astrophysics

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The large surveys and sensitive instruments of modern astronomy are turning ever more examples of variable objects, many of which are extending the parameter space to testing theories of stellar evolution and accretion. Future projects such as the Laser Interferometer Space Antenna (LISA) and the Large Synoptic Survey Telescope (LSST) will only add more challenging candidates to this list. Understanding such objects often requires fast spectroscopy, but the trend for ever larger detectors makes this difficult. In this contribution I outline the science made possible by high-speed spectroscopy, and consider how a combination of the well-known progress in computer technology combined with recent advances in CCD detectors may finally enable it to become a standard tool of astrophysics.Comment: To appear in the proceedings of the meeting on High Time Resolution Astrophysics, Galway, June 200

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Simultaneous time-series spectroscopy and multi-band photometry of the sdBV PG 1605+072

Cited by 20 publications

References 28 publications

Time-resolved spectroscopy of the bright sdBV Balloon 090100001

Time-resolved spectroscopy of the bright sdBV Balloon 090100001

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

High-Speed Optical Spectroscopy

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