2001A&A...372..119O


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET04:57:50

2001A&A...372..119O - Astronomy and Astrophysics, volume 372, 119-129 (2001/6-2)

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

OLAH K., STRASSMEIER K.G., KOVARI Z. and GUINAN E.F.

Abstract (from CDS):

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 1230K±270K relative to the photosphere is found. This value agrees with previous results from TiO modeling (1330K±110K). 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 10000K 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.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: atmospheres - stars: late-type - stars: individual: V833 Tau - stars: binaries: close

Simbad objects: 4

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Number of rows : 4

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 HD 283749 * 04 36 44.5555303221 +27 15 19.308792811   9.99 9.5     F8 17 0
2 HD 283750 BY* 04 36 48.2413370074 +27 07 55.898311812   9.354   7.4   K2.5Ve 256 2
3 HD 283776 * 04 41 02.7674700457 +27 50 38.759163808   11.13 9.69     K2 5 0
4 V* BY Dra BY* 18 33 55.7719224141 +51 43 08.903033617 10.22 9.23   8.733   K4Ve+K7.5Ve 595 0

    Equat.    Gal    SGal    Ecl

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2020.10.26-04:57:50

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