Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

TA Lister; Andrew Collier Cameron; Ronald William Hilditch

Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

TA Lister, Andrew Collier Cameron, Ronald William Hilditch

School of Physics and Astronomy

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

10 Citations (Scopus)

Abstract

We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998-2000. We also find marginal evidence from the O-C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.

Original language	English
Pages (from-to)	pp.1489-1498.
Number of pages	10
Journal	Monthly Notices of the Royal Astronomical Society
Volume	326
Issue number	4
Publication status	Published - 1 Oct 2001

Keywords

stars : activity
binaries : eclipsing
stars : imaging
stars : individual : XY UMa
stars : late-type
stars : magnetic fields
ORBITAL PERIOD MODULATION
DIFFERENTIAL ROTATION
CLOSE BINARIES
URSAE-MAJORIS
AB DORADUS
SYSTEM
TEMPERATURE
PHOTOMETRY
EVOLUTION
AREA

Cite this

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title = "Starspot distributions on XY UMa during 1997-2000 from eclipse mapping",

abstract = "We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998-2000. We also find marginal evidence from the O-C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.",

keywords = "stars : activity, binaries : eclipsing, stars : imaging, stars : individual : XY UMa, stars : late-type, stars : magnetic fields, ORBITAL PERIOD MODULATION, DIFFERENTIAL ROTATION, CLOSE BINARIES, URSAE-MAJORIS, AB DORADUS, SYSTEM, TEMPERATURE, PHOTOMETRY, EVOLUTION, AREA",

author = "TA Lister and Cameron, {Andrew Collier} and Hilditch, {Ronald William}",

year = "2001",

month = oct,

day = "1",

language = "English",

volume = "326",

pages = "pp.1489--1498.",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press",

number = "4",

}

TY - JOUR

T1 - Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

AU - Lister, TA

AU - Cameron, Andrew Collier

AU - Hilditch, Ronald William

PY - 2001/10/1

Y1 - 2001/10/1

N2 - We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998-2000. We also find marginal evidence from the O-C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.

AB - We present narrow-band red light curves and surface maps of the short-period RS CVn binary system XY UMa, obtained between 1997 January and 2000 March. The light-curve morphology of this system is known to vary on time-scales of a few days. We have used eclipse-mapping techniques to map the distribution of cool starspots on the surface of the primary star. The resulting maps show the continued evolution of spot features on time-scales of a few days to a week. By comparison with the images of Collier Cameron & Hilditch, we also find evidence for longer term trends, including a decline to an activity minimum during 1997 and a rise in activity during 1998-2000. We also find marginal evidence from the O-C ephemeris curves for a periodicity and a peak corresponding to the time of activity minimum.

KW - stars : activity

KW - binaries : eclipsing

KW - stars : imaging

KW - stars : individual : XY UMa

KW - stars : late-type

KW - stars : magnetic fields

KW - ORBITAL PERIOD MODULATION

KW - DIFFERENTIAL ROTATION

KW - CLOSE BINARIES

KW - URSAE-MAJORIS

KW - AB DORADUS

KW - SYSTEM

KW - TEMPERATURE

KW - PHOTOMETRY

KW - EVOLUTION

KW - AREA

UR - http://www.scopus.com/inward/record.url?scp=0042593461&partnerID=8YFLogxK

M3 - Article

SN - 0035-8711

VL - 326

SP - pp.1489-1498.

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

Starspot distributions on XY UMa during 1997-2000 from eclipse mapping

Abstract

Keywords

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