J/AJ/159/292 Chromospheric activity of SZ Piscium (Cao+, 2020)
Further investigation on chromospheric and prominence activity of the RS Canum
Venaticorum Star SZ Piscium.
Cao D., Gu S., Wolter U., Mittag M., Schmitt J.H.M.M.
<Astron. J., 159, 292 (2020)>
=2020AJ....159..292C 2020AJ....159..292C
ADC_Keywords: Stars, variable; Stars, double and multiple; Spectra, optical
Keywords: Stellar activity ; Close binary stars ; High resolution spectroscopy ;
Stellar chromospheres ; Stellar flares
Abstract:
To continue our study on chromospheric activity and detection for
possible prominence events of the very active RS Canum Venaticorum
star SZ Piscium (SZ Psc), long-term high-resolution spectroscopic
observations were obtained during several observing runs from 2014 to
2018. Based on the spectral subtraction technique, the chromospheric
emission of the CaII IRT (λ8662, λ8542, and
λ8498), Hα, NaI D1, D2 doublet, Hβ, and CaII
H & K lines is mainly associated with the K1 IV primary star of the SZ
Psc system, in good agreement with the previous studies, and the F8 V
secondary star also shows some chromospheric emission, implying its
active chromosphere. Moreover, an optical flare characterized by the
HeI D3 line emission together with stronger emission in the other
indicators was detected. Furthermore, two chromospheric active
longitudes around the two quadratures of the system were identified
for most of the time, and the chromospheric activity shows significant
changes during a few orbital cycles. The chromospheric activity level
seems to show a long-term variation during our observations. There
were some excess absorption features in the subtracted Hα line
and the other activity indicators, which would be caused by
prominence-like materials associated with the K1 IV primary star of
the system. Prominence materials could absorb the chromospheric
emission and continuum from the K1 IV primary star and even the F8 V
secondary one.
Description:
High-resolution spectroscopic observations of the SZ Psc system were
performed during several observing runs from 2014 to 2018. Most of the
spectroscopic observations were carried out with the 2.16m telescope
at the Xinglong station of National Astronomical Observatories and the
2.4m telescope at the Lijiang station of Yunnan observatories, Chinese
Academy of Sciences, respectively. The same fiber-fed High-Resolution
Echelle Spectrograph (HiRES), which has a resolving power of
R=λ/Δλ∼48000 over the wavelength range from 3900
to 9500Å, was equipped to both telescopes and the 4096x4096pixel
CCD detectors were respectively used to record the echelle spectra
during our observations.
Objects:
-----------------------------------------------
RA (2000) DE Designation(s)
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23 13 23.78 +02 40 31.6 V* SZ Psc = HD 219113
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 47 218 Log of the SZ Psc observations
table2.dat 95 218 Measurements for the subtraction profiles
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See also:
V/128 : Chromospherically Active Binaries. Third version (Eker+, 2008)
J/PASP/108/313 : Empirical stellar flux scales (Hall 1996)
J/A+AS/146/103 : CaII H&K to CaII IRT echelle spectra (Montes+, 2000)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/MNRAS/349/1069 : Chromospherically active binaries (Karatas+, 2004)
J/A+A/480/495 : Patterns of color variat. in close binaries (Messina, 2008)
J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011)
J/MNRAS/449/1380 : Optical chromospheric activity of V711 Tau (Cao+, 2015)
J/MNRAS/456/314 : Obs. log of the eclipsing binary SZ Piscium (Xiang+, 2016)
J/ApJ/835/61 : Chromospherically active stars in RAVE. II. (Zerjal+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Year [2014/2018] Observation year
6- 12 A7 "month" Month Observation month
14- 14 A1 --- Tel Telescope code (1)
16- 19 I4 yr Obs.Y [2014/2018] Year of the observation
21- 22 I2 "month" Obs.M [8/12] Month of the observation
24- 25 I2 d Obs.D [1/31] Day of the observation
27- 35 F9.4 d HJD [6937/8450] Heliocentric Julian Date JD-2450000
37- 42 F6.4 --- Phase [0.04/0.95] Phase
44- 47 I4 s Texp [810/3000] Exposure time
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Note (1): Telescopes as follows:
A = Xinglong 2.16m telescope;
B = Lijiang 2.4m telescope;
C = TIGRE 1.2m telescope.
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 yr Year [2014/2018] Observation year
6- 12 A7 "month" Month Observation month
14- 22 F9.4 d HJD [6937/8450] Heliocentric Julian Date, JD-2450000
24- 29 F6.4 --- Phase [0.04/0.95] Phase
31- 35 F5.3 0.1nm Ca2-8662 [0.73/1.19] Ca II 8662A equivalent width
37- 41 F5.3 0.1nm e_Ca2-8662 [0/0.04] Uncertainty in Ca2-8662
43- 47 F5.3 0.1nm Ca2-8542 [0.87/1.58] Ca II 8542A equivalent width
49- 53 F5.3 0.1nm e_Ca2-8542 [0/0.04] Uncertainty in Ca2-8542
55- 59 F5.3 0.1nm Ca2-8498 [0.54/0.87] Ca II 8498A equivalent width
61- 65 F5.3 0.1nm e_Ca2-8498 [0/0.1] Uncertainty in Ca2-8498
67- 71 F5.3 0.1nm Ha [0.39/2.37] Hα equivalent width
73- 77 F5.3 0.1nm e_Ha [0.007/0.06] Uncertainty in Ha
79- 84 F6.3 0.1nm Hb [-0.2/0.48]? Hβ equivalent width
86- 90 F5.3 0.1nm e_Hb [0.01/0.04]? Uncertainty in Hb
92- 95 F4.2 --- Ratio [1.32/2.04] Ratio of Ca II 8542/8498 equivalent
width lines
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History:
From electronic version of the journal
References:
Cao et al 2019MNRAS.482..988C 2019MNRAS.482..988C
(End) Prepared by [AAS], Coralie Fix [CDS], 14-Sep-2020