Photoelectric observations of cepheids in 1997–98

Ignatova, Valentina; Vozyakova, O. V.

doi:10.1080/10556790008241357

Cited by 20 publications

(7 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It has a mean V brightness of ∼9.1 mag and a pulsation period of ∼4.925 d. Its brightness variation was discovered by Strohmeier, Knigge & Ott (1963). Further multicolor photoelectric and CCD photometric observations were published by Wachmann (1976); Szabados (1977); Arellano Ferro et al (1998); Ignatova & Vozyakova (2000); Berdnikov (2008); Pigulski et al (2009), while radial velocity data were published by Gorynya et al (1998); Imbert (1999). Detailed spectroscopic analysis was performed by Luck, Kovtyukh & Andrievsky (2006) and Molenda-Żakowicz, Frasca & Latham (2008) who determined the basic atmospheric parameters.…”

Section: Introductionmentioning

confidence: 92%

TheKeplerCepheid V1154 Cyg revisited: light curve modulation and detection of granulation

Derekas

Plachy

Molnár

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

We present a detailed analysis of the bright Cepheid-type variable star V1154 Cygni using 4 years of continuous observations by the Kepler space telescope. We detected 28 frequencies using standard Fourier transform method. We identified modulation of the main pulsation frequency and its harmonics with a period of ∼159 d. This modulation is also present in the Fourier parameters of the light curve and the O-C diagram. We detected another modulation with a period of about 1160 d. The star also shows significant power in the low-frequency region that we identified as granulation noise. The effective timescale of the granulation agrees with the extrapolated scalings of red giant stars. Non-detection of solar-like oscillations indicates that the pulsation inhibits other oscillations. We obtained new radial velocity observations which are in a perfect agreement with previous years data, suggesting that there is no high mass star companion of V1154 Cygni. Finally, we discuss the possible origin of the detected frequency modulations.

show abstract

Section: Introductionmentioning

confidence: 92%

TheKeplerCepheid V1154 Cyg revisited: light curve modulation and detection of granulation

Derekas

Plachy

Molnár

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

show abstract

“…The resulting radial velocities are presented in Table 1 and represented graphically in Figure 1, taking into account seasonal shifts. We also made use of all published photographic and photovisual observations of the star (Dragomiretskaya & Zessewitsch 1971), photoelectric observations (Forbes 1982;Berdnikov 1986Berdnikov , 1987Berdnikov , 1992aBerdnikov , 1992bBerdnikov , 1992cBerdnikov , 1992dBerdnikov , 1992e, 1993Berdnikov & Vozyakova 1995;Berdnikov et al 1997bBerdnikov et al , 1998Ignatova & Vozyakova 2000), and radial velocity measurements.…”

Section: Observational Data and Methods Of Analysismentioning

confidence: 99%

A Search for Evolutionary Changes in the Periods of Cepheids Using Archival Data from the Harvard Observatory Plate Collection. III. GY Sagittae

Бердников¹,

Pastukhova²,

Gorynya³

et al. 2007

PUBL ASTRON SOC PAC

View full text Add to dashboard Cite

ABSTRACT.A total of 1095 magnitude estimates for the long-period classical Cepheid GY Sge ( days), P p 51 derived from the photographic plate collections of Harvard College Observatory, Sonneberg Observatory, and Sternberg Astronomical Institute, were combined with 48 new radial velocity measures obtained using the correlation spectrometer on the 1 m reflector of the Crimean Astrophysical Observatory. The data, in combination with published photometry (including observations from the All Sky Automated Survey 3) and radial velocity measurements, cover a time baseline spanning 116 years. The resulting data display evolutionary changes O Ϫ C in the period of GY Sge amounting to ϩ s yr Ϫ1 , a value in good agreement with theoretical predictions 203 ‫ע‬ 27 for a star in the third crossing of the instability strip. Large cyclical drifts with durations of ∼23,000 days superposed on the parabolic evolutionary trend in the data exhibit the positive signature of random O Ϫ C fluctuations in pulsation period, of magnitude similar to what is found in other pulsating stars of similar period.

show abstract

“…The first reliable light curve based on photoelectric U BV observations was published by Wachmann (1976). Further multicolour photoelectric and CCD photometric data were published by Szabados (1977), Arellano Ferro et al (1998), Ignatova & Vozyakova (2000), Berdnikov (2008) and Pigulski et al (2009). This latter paper contains the data of a dedicated photometric survey of the whole Kepler field.…”

Section: Observational Data Prior Keplermentioning

confidence: 96%

Cepheid investigations using the Kepler space telescope

Szabo¹,

Szabados²,

Ngeow³

et al. 2011

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

We report results of initial work done on selected candidate Cepheids to be observed with the Kepler space telescope. Prior to the launch 40 candidates were selected from previous surveys and databases. The analysis of the first 322 days of Kepler photometry, and recent ground-based follow-up multicolour photometry and spectroscopy allowed us to confirm that one of these stars, V1154 Cyg (KIC 7548061), is indeed a 4.9-d Cepheid. Using the phase lag method we show that this star pulsates in the fundamental mode. New radial velocity data are consistent with previous measurements, suggesting that a long-period binary component is unlikely. No evidence is seen in the ultra-precise, nearly uninterrupted Kepler photometry for nonradial or stochastically excited modes at the micromagnitude level. The other candidates are not Cepheids but an interesting mix of possible spotted stars, eclipsing systems and flare stars.Comment: 13 pages, 15 figures, accepted for publication in MNRAS, electronic-only tables are available upon request from the first autho

show abstract

Photoelectric observations of cepheids in 1997–98

Cited by 20 publications

References 2 publications

TheKeplerCepheid V1154 Cyg revisited: light curve modulation and detection of granulation

TheKeplerCepheid V1154 Cyg revisited: light curve modulation and detection of granulation

A Search for Evolutionary Changes in the Periods of Cepheids Using Archival Data from the Harvard Observatory Plate Collection. III. GY Sagittae

Cepheid investigations using the Kepler space telescope

Contact Info

Product

Resources

About