Time-series photometric spot modeling. IV. The multi-periodic K5Ve binary V833 Tauri

K. Oláh, K. G. Strassmeier, Z. Kővári, E. F. Guinan

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

We analysed all the existing photometric observations of V833 Tau and found long-term variability on time scales of ≈70 years, 6.5 years and 2.4 years. Using V and IC-band data from 1990-2000, we obtained starspot surface distributions from 20 suitable light curves. We found that the spot-area changes generally follow the long-term light variations. Spot temperatures are determined for each of the datasets and an average value of 1230 K ± 270 K relative to the photosphere is found. This value agrees with previous results from TiO modeling (1330 K ± 110 K). Small scale spot temperature and area changes are recovered during 1997-1999, that we explain with a variable spot/faculae ratio. A powerful flare in UBV(RI)C was observed in 1993 November. A 10 000 K fit yielded a total emitted flare energy of more than 1034 ergs from an area of about 1.3% of the stellar surface, 60% of it in the V(RI)C bands. The flare characteristics are compared to another, 100-times smaller flare observed earlier in 1983.

Original languageEnglish
Pages (from-to)119-129
Number of pages11
JournalAstronomy and Astrophysics
Volume372
Issue number1
Publication statusPublished - Jun 2001

Fingerprint

flares
time series
erg
modeling
temperature
starspots
timescale
faculae
C band
photosphere
light curve
energy
distribution

Keywords

  • Stars: activity
  • Stars: atmospheres
  • Stars: binaries: close
  • Stars: individual: V833 Tau
  • Stars: late-type

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Time-series photometric spot modeling. IV. The multi-periodic K5Ve binary V833 Tauri. / Oláh, K.; Strassmeier, K. G.; Kővári, Z.; Guinan, E. F.

In: Astronomy and Astrophysics, Vol. 372, No. 1, 06.2001, p. 119-129.

Research output: Contribution to journalArticle

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AU - Guinan, E. F.

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AB - We analysed all the existing photometric observations of V833 Tau and found long-term variability on time scales of ≈70 years, 6.5 years and 2.4 years. Using V and IC-band data from 1990-2000, we obtained starspot surface distributions from 20 suitable light curves. We found that the spot-area changes generally follow the long-term light variations. Spot temperatures are determined for each of the datasets and an average value of 1230 K ± 270 K relative to the photosphere is found. This value agrees with previous results from TiO modeling (1330 K ± 110 K). Small scale spot temperature and area changes are recovered during 1997-1999, that we explain with a variable spot/faculae ratio. A powerful flare in UBV(RI)C was observed in 1993 November. A 10 000 K fit yielded a total emitted flare energy of more than 1034 ergs from an area of about 1.3% of the stellar surface, 60% of it in the V(RI)C bands. The flare characteristics are compared to another, 100-times smaller flare observed earlier in 1983.

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