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A survey for variable young stars with small telescopes: III -- Warm spots on the active star V1598Cyg | | Dirk Froebrich
; Aleks Scholz
; Jochen Eislöffel
; Bringfried Stecklum
; | | Date: |
29 Jul 2020 | | Abstract: | Magnetic spots on low-mass stars can be traced and characterised using
multi-band photometric light curves. Here we analyse an extensive data set for
one active star, V1598Cyg, a known variable K dwarf which is either pre-main
sequence and/or in a close binary system. Our light curve contains 2854
photometric data points, mostly in $V$, $R_c$, $I_c$, but also in $U$, $B$ and
$Halpha$, with a total baseline of about 4yr, obtained with small telescopes
as part of the HOYS project. We find that V1598Cyg is a very fast rotator with
a period of 0.8246 days and varying amplitudes in all filters, best explained
as a signature of strong magnetic activity and spots. We fit the photometric
amplitudes in $V$, $R_c$, $I_c$ and use them to estimate spot properties, using
a grid-based method that is also propagating uncertainties. We verify the
method on a partial data set with high cadence and all five broad-band filters.
The method yields spot temperatures and fractional spot coverage with typical
uncertainties of 100K and 3-4%, respectively. V1598Cyg consistently exhibits
spots that are a few hundred degrees warmer than the photosphere, most likely
indicating that the light curve is dominated by chromospheric plage. The spot
activity varies over our observing baseline, with a typical time scale of
0.5-1yr, which we interpret as the typical spot lifetime. Combining our light
curve with archival data, we find a six year cycle in the average brightness,
that is probably a sign of a magnetic activity cycle. | | Source: | arXiv, 2007.14969 | | Services: | Forum | Review | PDF | Favorites | |
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