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J/A+A/325/1115 Near-simultaneous ROSAT and Mt Wilson data (Piters+ 1997)
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Coronal and chromospheric emission from cool stars in near-simultaneous
ROSAT All-Sky Survey and Mount Wilson data
Piters A.J.M., Schrijver C.J., Schmitt J.H.M.M., Rosso C.,
Baliunas S.L., Van Paradijs J., Zwaan C.
<Astron. Astrophys. 325, 1115 (1997)>
=1997A&A...325.1115P
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ADC_Keywords: Stars, late-type ; X-ray sources
Keywords: stars: activity - stars: chromospheres - stars: coronae -
stars: late-type - X-rays: stars
Description:
Table 1 lists near-simultaneous X-ray data and Ca II H&K line-core
emission data from the ROSAT All-Sky Survey and from the
Mt. Wilson H&K spectrometer, respectively. The stars in this sample
are 215 bright F-, G-, and K-type stars.
Table 2 lists the derived excess Ca II H&K line-core and the X-ray
flux densities for the same stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1 115 215 X-ray and Ca II data
table2 52 215 Flux densities
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Byte-by-byte Description of file: table1
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number
8- 11 F4.2 --- B-V B-V (from [1])
13- 15 A3 --- Bin Information on binarity, See Note (1)
17- 27 A11 --- Type Spectral Type (from [1])
29- 34 F6.1 d JDCa Obs. Time Ca II (JD-2444000)
36- 41 F6.1 d JDX Obs. Time X-ray (JD-2444000)
43- 48 F6.1 d T(Ca-X) Obs. Time Difference (Ca II - X-ray)
50- 55 F6.4 --- Sval S-value
57- 62 F6.4 --- e_Sval Uncertainty in S-value
64 A1 --- n_Sval Note on Sval. See Note (2)
66 A1 --- l_Xrate [U] Upper limit for Xrate. See Note (3)
68- 73 F6.3 ct/s Xrate X-ray Count Rate
75- 79 F5.3 ct/s E_Xrate ? Pos. Uncertainty in Count Rate
81- 85 F5.3 ct/s e_Xrate ? Neg. Uncertainty in Count Rate
87- 91 F5.3 --- HR ? Hardness Ratio
93- 97 F5.3 --- E_HR ? Pos. Uncertainty in Hardness Ratio
99-103 F5.3 --- e_HR ? Neg. Uncertainty in Hardness Ratio
105 A1 --- n_Xrate Note on Xrate and HR. See Note (4)
107-110 F4.1 [cm-2] LogNH Hydrogen Column Density
112-114 F3.1 [cm-2] e_LogNH Uncertainty in LogNH
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Note (1): Information on binarity:
S: single
SB1: single-lined spectroscopic binary
SB2: double-lined spectroscopic binary
VB: visual binary
Note (2): Information on the S-value:
A: only one measurement, the uncertainty is 2%
B: S_val is the S2-value
C: S_val is the S1-value
blank (and A): S_val is the S1-value if the luminosity class is between IV and
V and S_val is the S2-value if the luminosity class is
between II to III-IV
Note (3): U: the X-ray Count Rate given is a 3 sigma upper limit value (no
hardness ratio and uncertainties are given)
blank: otherwise
Note (4): Information on Count Rate and Hardness Ratio:
D: Total Count Rate and mean Hardness Ratio of HD26913 + HD26923
or HD201091 + HD201092
E: Count Rate and Hardness Ratio derived from the ROSAT Standard
Analysis Software System
blank: no additional information
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number (Cat. <III/135>)
8- 12 F5.2 --- DFCa ? Excess CaII surface flux density (1)
14- 17 F4.2 --- E_DFCa ? Positive uncertainty in DFCa (1)
19- 22 F4.2 --- e_DFCa ? Negative uncertainty in DFCa (1)
24- 27 F4.2 [mW/m2] FX Log. X-ray surface flux density (2)
29- 32 F4.2 [mW/m2] E_FX ? Positive uncertainty in FX (2)
34- 37 F4.2 [mW/m2] e_FX ? Negative uncertainty in FX (2)
39- 44 F6.2 --- DRCaII ? Exc. CaII normalized flux dens. (1)
46- 50 F5.2 --- RX X-ray normalized flux density (2)
52 A1 --- Note See Note (3)
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Note (1): DFCa is the logarithmic Ca II H&K line-core emission surface flux
density in excess of the minimum flux density derived by
Rutten (1987A&A...177..131R) DFCa is expressed in
Rutten's arbitrary units (1982A&A...130..353R)
(Logarithmic) uncertainties are given in the same units.
If the negative uncertainty is missing (left blank), the uncertainty
is infinity, meaning that the negative uncertainty in the
non-logarithmic value is of the order of the value itself; this
occurs when the Ca II flux density is close to the minimum flux
density.
If no value is given for the excess Ca II surface flux density and
the normalized flux density (DRCaII) the calculated Ca II flux
density is smaller than the minimum flux density.
Note (2): FX is the logarithmic X-ray surface flux density in erg/(s*cm^2).
if the uncertainties E_FX and e_F_X is missing (left blank), the
surface flux density and the normalized flux density, RX, are upper
limit values.
Note (3): A: Total FX and RX of HD 26913 + HD 26923
B: Total FX and RX of HD 201091 + HD 201092
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Acknowledgements: Ankie Piters <piters@knmi.nl>
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(End) Patricia Bauer [CDS] 09-Jun-1997