Suspected Starspots Found on the K Giants in Seven Ellipsoidal RS CVn-Type Binaries

Kaye, A. B.; Hall, D. S.; Henry, Gregory W.; Eaton, J. A.; Lines, R. D.; Lines, H. C.; Barksdale, W. S.; Beck, Sara J.; Chambliss, C. R.; Fried, Robert; Genet, R. M.; Hopkins, J. L.; Lovell, L. P.; Louth, H.; Montle, R. E.; Renner, T. R.; Stelzer, H. J.

doi:10.1086/117443

Cited by 12 publications

(21 citation statements)

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“…On the other hand, the trigonometric parallax obtained by the Hipparcos satellite, that falls in the 87−105 parsec range, corresponds to an absolute magnitude in the 2.16−2.57 range, that is characteristic of a class IV star. Kaye et al 1995) In fact, the colors are very well matched also by those of a single active K2 IV star, whose radius results, assuming a photospheric temperature of 4600 K, in the 5.2 − 6.3 R range.…”

Section: +016supporting

confidence: 56%

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Long-term monitoring of active stars

Cutispoto

1998

Astron. Astrophys. Suppl. Ser.

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Section: +016supporting

confidence: 56%

“…The data are shown in Fig. 26, where the 11.13448-day orbital period deduced by Kaye et al (1995) was used for phase computation. The light curve is double-peaked and clear color variations showing the star redder at minimum luminosity are present.…”

Section: +016mentioning

confidence: 99%

Long-term monitoring of active stars

Cutispoto

1998

Astron. Astrophys. Suppl. Ser.

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“…HD 136905 = GX Lib is an SB1 binary with an orbital period of 11.13448 days (Kaye et al 1995). It shows moderate Ca II H&K emission (Bidelman & MacConnell 1973;Strassmeier et al 1994b), strong Hα absorption (Eker et al 1995) and very low Li abundance .…”

Section: Resultsmentioning

confidence: 99%

“…The data are shown in Fig. 18, where the 11.13448-day spectroscopic period deduced by Kaye et al (1995) was used for phase computation. The light curve is double-peaked and clear color variations showing the star redder at minimum luminosity are present.…”

Section: Resultsmentioning

confidence: 99%

Long-term monitoring of active stars

Cutispoto

1998

Astron. Astrophys. Suppl. Ser.

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Abstract. In the framework of an extensive program focusing on the global properties and evolution of active stars, high-precision UBV (RI) c photometry of 19 selected stars, collected at the European Southern Observatory over the 15-31 March 1991 interval is presented. Significant evolution of the light curves, period variations and evidence for long-term variability of the global degree of spottedness are found. Most of the spectral classifications are discussed. A flare event was detected for the star HD 127535 = V 841 Cen. These observations contribute to the establishment of a time-extended photometric database which can give important clues on topics such as the stability of spotted areas, differential rotation, solar-like cycles and the correlation between inhomogeneities at different atmospheric levels 1 .

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“…The main contributor to the light curve variability is the ellipticity effect (Stebbins 1928). Kaye et al (1995) were able to subtract that effect from the photometry and recovered the spot wave with amplitudes between 0.…”

Section: Sao 91772 (Ln Peg) This Is Also Bd+13mentioning

confidence: 99%

Starspot photometry with robotic telescopes. $UBV(RI)_{\rm C}$ and by light curves of 47 active stars in 1996/97

Strassmeier

Serkowitsch

Granzer

1999

Astron. Astrophys. Suppl. Ser.

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Abstract. We present continuous multicolor photometry for 47 stars from October 1996 through June 1997. Altogether, 7073 V (RI) c , UBV , and by data points, each the average of three individual readings, were acquired with three automatic photoelectric telescopes (APTs) at Fairborn Observatory in southern Arizona. Most of our targets are chromospherically active single and binary stars of spectral type G to K but there are also four pre-main-sequence objects and three pulsating stars in our sample. The light variability is generally due to rotational modulation of an asymmetrically spotted stellar surface and therefore precise rotational periods and their seasonal variations are determined from Fourier analysis. We also report on photometric variations of γ CrB (A0V) with a period of 0.44534 days. All data are available in numerical form.

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Suspected Starspots Found on the K Giants in Seven Ellipsoidal RS CVn-Type Binaries

Cited by 12 publications

References 0 publications

Long-term monitoring of active stars

Long-term monitoring of active stars

Long-term monitoring of active stars

Starspot photometry with robotic telescopes. $UBV(RI)_{\rm C}$ and by light curves of 47 active stars in 1996/97

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