J/A+A/551/A2 Light curves of DP CVn and DI Psc (Kovari+, 2013)
Doppler imaging of stellar surface structure.
XXIV. The lithium-rich single K-giants DP Canum Venaticorum and DI Piscium.
Kovari Zs., Korhonen H., Strassmeier K.G, Weber M., Kriskovics L.,
Savanov I.
<Astron. Astrophys. 551, A2 (2013)>
=2013A&A...551A...2K 2013A&A...551A...2K
ADC_Keywords: Stars, late-type ; Photometry ; Spectroscopy ; Line Profiles
Keywords: stars: activity - stars: imaging - stars: late-type -
stars: starspots - stars: individual: DP CVn -
stars: individual: DI Psc
Abstract:
We present the first Doppler imaging study of the two rapidly
rotating, single K-giants DP CVn and DI Psc in order to study the
surface spot configuration and to pinpoint their stellar evolutionary
status. Optical spectroscopy and photometry are used to determine the
fundamental astrophysical properties. Doppler imaging is applied to
recover the surface temperature distribution for both stars, while
photometric light-curve inversions are carried out for studying the
long-term changes of the surface activity of DP CVn. Surface
differential rotation of DP CVn is estimated from cross-correlating
the available subsequent Doppler reconstructions separated by roughly
one rotation period.
Both stars appear to have higher than normal lithium abundance, LTE
logn of 2.28 (DP CVn) and 2.20 (DI Psc), and are supposed to be
located at the end of the first Li dredge-up on the RGB. Photometric
observations reveal rotational modulation with a period of 14.010d
(DP CVn) and 18.066d (DI Psc).
Doppler reconstructions from the available mapping lines well agree in
the revealed spot patterns, recovering rather low latitude spots for
both stars with temperature contrasts of {DELTA}T∼600-800K below the
unspotted photospheric background. Spots at higher latitudes are also
found but either with less contrast (DP CVn) or with smaller extent
(DI Psc). A preliminary antisolar-type differential rotation with
α=-0.035 is found for DP CVn from cross-correlating the
subsequent Doppler images. Long-term photometric analysis supports the
existence of active longitudes, as well as the differential rotation.
Description:
Differential photometric magnitudes of DP CVn and DI Psc obtained with
'Wolfgang' (in Stroemgren b, y) and 'Amadeus' (in Johnson-Cousins
V, Ic), the two automated photoelectric telescopes owned by the
Leibniz-Institute for Astrophysics Potsdam (formerly of University of
Vienna), located at Fairborn Observatory in Arizona, USA. Comparison
stars were HD1095129 (for DP CVn) and HD217019 (for DI Psc).
Objects:
----------------------------------------------------------
RA (2000) DE Designation(s) (Per)
----------------------------------------------------------
12 36 16.97 +51 30 52.3 DP CVn = HD 109703 (14.010)
22 59 59.39 +05 09 34.5 DI Psc = HD 217352 (18.066)
----------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
dpcvn_dv.dat 32 617 Differential magnitudes of DP CVn in Johnson V
dpcvn_di.dat 32 589 Differential magnitudes of DP CVn in Cousins Ic
dpcvn_db.dat 32 179 Differential magnitudes of DP CVn in Stroemgren b
dpcvn_dy.dat 32 242 Differential magnitudes of DP CVn in Stroemgren y
dipsc_dv.dat 32 91 Differential magnitudes of DI Psc in Johnson V
dipsc_di.dat 32 81 Differential magnitudes of DI Psc in Cousins Ic
dipsc_db.dat 32 38 Differential magnitudes of DI Psc in Stroemgren b
dipsc_dy.dat 32 121 Differential magnitudes of DI Psc in Stroemgren y
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Byte-by-byte Description of file: dpcvn_*.dat dipsc_*.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Day
15- 22 F8.5 mag Dmag Differential magnitude in Filter
24- 30 F7.5 mag e_Dmag Error in Dmag
32 A1 --- Filt [bivy] Filter (1)
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Note (1): Filters as follows:
v = Johnson V
i = Cousins Ic
b = Stoemgren b
y = Stoemgren y
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Acknowledgements:
Zs Kovari, kovari(at)konkoly.hu
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(End) Zs Kovari [Konkoly Obs, Hungary], Patricia Vannier [CDS] 09-Jan-2013