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Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau. / Alekseev, I. Yu.; Kozhevnikova, A. v.
In: Astrophysics, Vol. 47, No. 4, 01.10.2004, p. 443-453.

Research output: Contribution to journal › Article › peer-review

Harvard

Alekseev, IY & Kozhevnikova, AV 2004, 'Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau', Astrophysics, vol. 47, no. 4, pp. 443-453. https://doi.org/10.1023/B:ASYS.0000049781.42096.c6

APA

Alekseev, I. Y., & Kozhevnikova, A. V. (2004). Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau. Astrophysics, 47(4), 443-453. https://doi.org/10.1023/B:ASYS.0000049781.42096.c6

Vancouver

Alekseev IY, Kozhevnikova AV. Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau. Astrophysics. 2004 Oct 1;47(4):443-453. doi: 10.1023/B:ASYS.0000049781.42096.c6

Author

Alekseev, I. Yu. ; Kozhevnikova, A. v. / Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau. In: Astrophysics. 2004 ; Vol. 47, No. 4. pp. 443-453.

BibTeX

@article{6d74e865ba024b0fb755347326a6010a,
title = "Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau",
abstract = "UBVRI photometric observations and models of spotting are presented for four noneclipsing RS CVn systems: IN Com (G5III/IV), IL Com (F8V+F8V), UX Ari (K01V+G5V), and V711 Tau (K1IV+G5V). A low amplitude variability caused by cold (ΔT=1700K)spots which can occupy up to 19% of the star's surface is confirmed for the little-studied star IL Com. Long-term light curves are constructed and the stellar magnitudes and color indices of the unspotted photospheres are estimated for IN com, UX Ari, and V711 Tau. It is shown that UX Ari becomes bluer with decreasing brightness, so its variability cannot be fully explained in terms of cold spots. Models of spotting on In Com and V711 Tau are constructed from the full set of available photometric observations. The spots on both of these variables lie at middle latitudes and occupy up to 22% (In Com) and 33% (V711 Tau) of the stars' surfaces. Both stars manifest a tendency for the width of the spots to decrease as their area increases. This is a crude analog of the Maunder butterflies. These stars experience cyclical spot activity and have a differential rotation of the type found on the sun.",
author = "Alekseev, {I. Yu.} and Kozhevnikova, {A. v.}",
year = "2004",
month = oct,
day = "1",
doi = "10.1023/B:ASYS.0000049781.42096.c6",
language = "English",
volume = "47",
pages = "443--453",
journal = "Astrophysics",
issn = "0571-7256",
publisher = "Springer",
number = "4",

}

RIS

TY - JOUR

T1 - Rotational Brightness Modulation and Starspots on the RS CVn-type Stars IN Com, IL Com, UX Ari, and V711 Tau

AU - Alekseev, I. Yu.

AU - Kozhevnikova, A. v.

PY - 2004/10/1

Y1 - 2004/10/1

N2 - UBVRI photometric observations and models of spotting are presented for four noneclipsing RS CVn systems: IN Com (G5III/IV), IL Com (F8V+F8V), UX Ari (K01V+G5V), and V711 Tau (K1IV+G5V). A low amplitude variability caused by cold (ΔT=1700K)spots which can occupy up to 19% of the star's surface is confirmed for the little-studied star IL Com. Long-term light curves are constructed and the stellar magnitudes and color indices of the unspotted photospheres are estimated for IN com, UX Ari, and V711 Tau. It is shown that UX Ari becomes bluer with decreasing brightness, so its variability cannot be fully explained in terms of cold spots. Models of spotting on In Com and V711 Tau are constructed from the full set of available photometric observations. The spots on both of these variables lie at middle latitudes and occupy up to 22% (In Com) and 33% (V711 Tau) of the stars' surfaces. Both stars manifest a tendency for the width of the spots to decrease as their area increases. This is a crude analog of the Maunder butterflies. These stars experience cyclical spot activity and have a differential rotation of the type found on the sun.

AB - UBVRI photometric observations and models of spotting are presented for four noneclipsing RS CVn systems: IN Com (G5III/IV), IL Com (F8V+F8V), UX Ari (K01V+G5V), and V711 Tau (K1IV+G5V). A low amplitude variability caused by cold (ΔT=1700K)spots which can occupy up to 19% of the star's surface is confirmed for the little-studied star IL Com. Long-term light curves are constructed and the stellar magnitudes and color indices of the unspotted photospheres are estimated for IN com, UX Ari, and V711 Tau. It is shown that UX Ari becomes bluer with decreasing brightness, so its variability cannot be fully explained in terms of cold spots. Models of spotting on In Com and V711 Tau are constructed from the full set of available photometric observations. The spots on both of these variables lie at middle latitudes and occupy up to 22% (In Com) and 33% (V711 Tau) of the stars' surfaces. Both stars manifest a tendency for the width of the spots to decrease as their area increases. This is a crude analog of the Maunder butterflies. These stars experience cyclical spot activity and have a differential rotation of the type found on the sun.

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U2 - 10.1023/B:ASYS.0000049781.42096.c6

DO - 10.1023/B:ASYS.0000049781.42096.c6

M3 - Article

VL - 47

SP - 443

EP - 453

JO - Astrophysics

JF - Astrophysics

SN - 0571-7256

IS - 4

ER -

ID: 44058286