Pulsation of the K 2.5 giant star GSC 09137-03505?

Kallinger, T.; Zwintz, K.; Pamyatnykh, A. A.; Guenther, D. B.; Weiß, W. W.

doi:10.1051/0004-6361:20040519

Cited by 20 publications

(17 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Fourier spectrum shows the highest amplitude at 6.51 d −1 , whereas maximum significance is obtained at 6.485 d −1 . Recent measurements (Kallinger & Zwintz, 2004) confirm the SigSpec result.…”

Section: Which Alias?supporting

confidence: 58%

“…On the other hand, measurements of the HST-FGS on GSC 09137-03505 (Kallinger et al 2004) provide complementary results. Fourier analysis, S/N estimation, and consecutive prewhitening return three significant components, whereas SigSpec provides 37 frequencies.…”

Section: Underestimation Of Significance By S/nmentioning

confidence: 99%

“…The amplitude spectrum (top) of HST-FGS data on GSC 09137-03505 shows a single peak reaching a S/N of 4. After consecutive prewhitening, three significant components are identified (Kallinger et al 2004). SigSpec yields 37 frequencies with a significance > 5.5 (bottom).…”

Section: Conclusion and Outreachmentioning

confidence: 99%

See 2 more Smart Citations

SigSpec – reliable computation of significance in Fourier space

Reegen

2004

Proc. IAU

View full text Add to dashboard Cite

Abstract. SigSpec is a new method to compute the significance of the amplitude levels in the frequency domain, based on the false-alarm probability associated with a peak in the amplitude spectrum. The underlying probability density function (PDF) of the amplitude spectrum generated by pure noise may explicitly be derived if treated as frequency and phase-dependent. A comparison of the analytical solution with the results of extensive numerical calculatgions provides excellent agreement. In addition, the SigSpec software has already demonstrated clear advantages compared with the commonly used Fourier methods in various respects. A few examples for ground-based as well as space photometry are presented.

show abstract

Section: Which Alias?supporting

confidence: 58%

Section: Underestimation Of Significance By S/nmentioning

confidence: 99%

See 1 more Smart Citation

SigSpec – reliable computation of significance in Fourier space

Reegen

2004

Proc. IAU

View full text Add to dashboard Cite

show abstract

“…Kallinger et al (2008a) found 16 and 20 pulsation frequencies for V 588 Mon and V 589 Mon, respectively, based on observations obtained during a ground based multi-site campaign. The two PMS pulsators were also observed repeatedly using the MOST satellite (Kallinger et al 2009), where many more pulsation frequencies were identified and studied asteroseismologically.…”

Section: The Young Open Cluster Ngc 2264mentioning

confidence: 99%

MOST observations of the young open cluster NGC 2264

Zwintz¹,

Hareter²,

Kuschnig

et al. 2009

A&A

Self Cite

View full text Add to dashboard Cite

Context. Photometric time series obtained from space are one of the best ways to study pulsations in pre-main sequence (PMS) stars, especially as the corresponding amplitudes are at the millimagnitude level or below. We present high-precision time-series photometry of stars in the field of NGC 2264 obtained with the MOST (Microvariability & Oscillations of STars) satellite. Aims. A search for pulsating A and F type members of NGC 2264 with ultra-precise MOST photometry was conducted. Methods. 68 stars in the field of NGC 2264 were observed simultaneously with the MOST satellite, 34 of which were previously identified as potential targets to search for PMS pulsation. The routines SigSpec and Period04 were used for the frequency analysis. Results. We discovered pulsation in 4 potential A and F type PMS members of NGC 2264 with frequencies between 2.7 h and 23 min. For one of the PMS pulsators identified with MOST after the first days of observation, simultaneous ground-based Strömgren photometry was obtained with the OSN 0.9 m telescope and confirms the highest frequency identified in the MOST photometry. 26 stars with other (i.e., hotter and cooler) spectral types show clear variability: SPB and γ Doradus pulsation, red giant oscillations, eclipsing binaries and variability caused by rotational modulation.

show abstract

“…Examples include the G9.5 giant Oph, based on radial velocities from the CORALIE and ELODIE spectrographs and Fabry Imaging photometry from the MOST satellite (Barban et al 2007), and the G7 giant ξ Hya, based on radial velocity measurements with the CORALIE spectrograph (Frandsen et al 2002), or the K2.5 giant star GSC 09137-03505 where Kallinger et al (2005) found oscillations, based on Fine Guidance Sensor photometry by the Hubble Space Telescope.…”

Section: Introductionmentioning

confidence: 99%

MOST found evidence for solar-type oscillations in the K2 giant star HD20884

Kallinger¹

2008

cia

View full text Add to dashboard Cite

Comments by the editor:The main message of the following paper is to report the detection of nonradial pulsation in a K giant. This is an important and controversial topic.A key issue for this investigation is the reliability of the extracted frequencies. Your editor has spent his life with Fourier amplitude spectra of high-precision ground-based photometry. From that experience, Figure 3 of the paper represents the natural result of instrumental instabilities and atmospheric transparency changes and does not deserve a second look. However, these are satellite observations without the typical ground-based difficulties -but there may be different problems.The statistical analyses can only help us in a limited way. It does not matter much whether one applies my favorite criterion of amplitude signal/noise ratio ≥ 4, the SigSpec values, or another method. All these statistical analyses rely on assumptions of the nature of noise present in the data. Again, in ground-based photometry, we have found that the statistics are not reliable for low-frequency peaks. The obvious method to verify that certain peaks are not noise is to look at a comparison sample: the authors provide the results for another star with a simpler light curve. In my opinion, the issue is not yet solved.T. Kallinger, D. B. Guenther, W. W. Weiss, et al. 85 AbstractWe found evidence for radial p-modes and nonradial mixed modes in the oscillation spectrum of the K giant HD 20884 based on 20.6 days of nearly continuous high-precision photometry obtained by the Canadian microsatellite MOST 1 . Oscillation frequencies range from 5-31 µHz (periods of about 2.3 d -9 hr) with luminosity amplitudes between about 300 and 950 ppm and mode lifetimes exceeding 10 days are indicated. The mode identifications are based on searches of a large grid of models for a best fit to the frequencies and temperature of HD 20884. The latter is better constrained now by spectroscopy obtained at the David Dunlap Observatory as part of this work.

show abstract

Pulsation of the K 2.5 giant star GSC 09137-03505?

Cited by 20 publications

References 17 publications

SigSpec – reliable computation of significance in Fourier space

SigSpec – reliable computation of significance in Fourier space

MOST observations of the young open cluster NGC 2264

MOST found evidence for solar-type oscillations in the K2 giant star HD20884

Contact Info

Product

Resources

About