2004A&A...421..273C


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST18:24:33

2004A&A...421..273C - Astronomy and Astrophysics, volume 421, 273-280 (2004/7-1)

On the photometric behaviour of the Pleiades K dwarf HII1883.

CLARKE D.

Abstract (from CDS):

Photometric data from a variety of sources have been analysed to check if effects of differential rotation or evolutionary spin-down can be detected in HII1883. Although the same light-curve form may be maintained for several years, shape changes and phase shifts do not allow sufficiently long time-bases for the required accuracy of period determination. One form of light-curve may have a tendency to recur with phase coherence. Using this observation allows determination of three potentially more accurate periods relative to the one previously established, but the choice of any revised value is subject to imprecise knowledge of the integer number of cycles over the time-base. The phase-locked tendency, if confirmed, requires some mechanism for spots to recur at a given longitude. A suggestion of the star being a magnetic oblique rotator is mooted but other observational and theoretical support would be required to promote this notion further. Evidence of small short-term changes occurring over just a few periods is explored. Comparison of the contemporaneous light-curve with the Hα line emission RV variations reveals a phase difference of 90°, so making a connection that the disturbances producing the photometric signals have the same location as those generating at least some part of the Hα emission. Finally a multi-spot model is presented to mimic the observed light-curves.

Abstract Copyright:

Journal keyword(s): stars: solar-type - stars: rotation

Simbad objects: 6

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Number of rows : 6

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 V* OU Tau Er* 03 45 32.9382648825 +24 18 11.647131333   14.63 13.36   12.02 K4V 82 0
2 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 3024 0
3 V* V660 Tau Er* 03 48 28.0287247729 +23 18 02.730679014   13.66 12.60   11.43 K2V 78 0
4 V* V816 Tau BY* 03 51 53.3859483764 +24 23 13.077396311   13.67 12.69   11.54 K0V 65 0
5 V* LQ Hya BY* 09 32 25.5684079124 -11 11 04.687410738 9.316 8.761 7.891 7.288 6.815 K1Vp 404 0
6 V* HK Aqr BY* 23 08 19.5510988144 -15 24 35.768241707 13.4 12.282 10.872 9.964 9.019 M0Ve 185 0

    Equat.    Gal    SGal    Ecl

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2020.10.24-18:24:33

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