J/A+A/430/303 MgII-K line fluxes in cool active and quiet stars (Cardini+, 2005)
Mg II chromospheric radiative loss rates in cool active and quiet stars.
Cardini D.
<Astron. Astrophys., 430, 303-311 (2005)>
=2005A&A...430..303C 2005A&A...430..303C
ADC_Keywords: Stars, late-type ; Ultraviolet ; Line Profiles
Keywords: stars: late-type - stars: chromospheres - stars: activity -
ultraviolet: general - line: profiles
Abstract:
The MgIIk emission line is a good indicator of the level of
chromospheric activity in late-type stars. We investigate the
dependence of this activity indicator on fundamental stellar
parameters. To this purpose we use IUE observations of the MgIIk
line in 225 late-type stars of luminosity classes I-V, with different
levels of chromospheric activity. We first re-analyse the relation
between MgIIk line luminosity and stellar absolute magnitude,
performing linear fits to the points. The ratio of MgII surface flux
to total surface flux is found to be independent of stellar luminosity
for evolved stars and to increase with decreasing luminosity for
dwarfs. We also analyse the MgIIk line surface flux-metallicity
connection.
Description:
The data base used in the present paper was generated starting from
the original sample of 230 normal stars used in a study of the
Wilson-Bappu effect by Cassatella et al. (2001, Cat. J/A+A/374/1085,
Paper I). It was a sample of stars with good quality MgII
observations from IUE (see Sect. 3) and known parallaxes from
HIPPARCOS with luminosity classes ranging from I to V. The resulting
sample (225 stars) consists of an accurately selected, uniformly
reduced and homogeneously calibrated data set.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 64 23 MgII-K line fluxes for BY Dra stars
table2.dat 71 29 MgII-K line fluxes for RS CVn stars
table3.dat 38 100 MgII-K line fluxes for normal stars
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See also:
J/A+A/374/1085 : MgII K line Wilson-Bappu relationship (Cassatella+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1 A1 --- --- [*]
2- 7 I6 --- HIP HIP number
9- 21 A13 --- Name Name
24- 34 A11 --- SpType MK spectral type
36 I1 --- r_SpType Reference for spectral type (1)
38- 41 F4.2 mag B-V B-V colour index
43- 46 F4.2 mag VMAG Absolute V magnitude
48- 51 F4.2 [mW/m2] logSF log of the surface MgIIk flux
53- 57 F5.2 [Sun] [Fe/H] ?=- Metallicity
59 A1 --- bin [*] indication of binarity (2)
61- 64 A4 --- Note Note for double-lined spectra objects (2)(3)
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Note (1): References as follows:
1 = Cutispoto et al., 1998, Cat. J/A+AS/131/321
2 = Cutispoto et al., 2003, Cat. J/A+A/400/649
3 = Gray et al., 2003, Cat. J/AJ/126/2048
4 = Strasbourg Data Center (SIMBAD)
5 = Catalog of Active Binary Stars (CABS) by Strassmeier et al.,
1993, Cat. V/76
Note (2): According to CABS (Cat. V/76) except for V838 Cen (see
Cutispoto 1998, Cat. J/A+AS/131/321)
Note (3): For objects with double-lined spectra, the last column indicates
which one of the stellar components is the active star.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8- 21 A14 --- Name Name
23- 39 A17 --- SpType MK spectral type (1)
40- 44 F5.1 d Per Orbital period (1)
46- 49 F4.2 mag B-V B-V colour index
51- 55 F5.2 mag VMAG Absolute V magnitude
57- 60 F4.2 [mW/m2] logSF log of the surface MgII-K flux
62- 66 F5.2 [Sun] [Fe/H] ?=- Metallicity
68- 71 A4 --- Note Note for double-lined spectra objects (2)
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Note (1): Spectral types and orbital periods are from the Catalog of
Active Binary Stars (CABS, V/76) except for IL Hya (see
Weber and Strassmeier, 1998A&A...330.1029W 1998A&A...330.1029W)
Note (2): According to CABS (Cat. V/76) except for TZ Tri and IL Hya
(see Montes et al., 1995A&AS..114..287M 1995A&AS..114..287M and Fekel et al., 1999,
Cat. J/A+AS/137/369 respectively).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP HIP number
8- 15 A8 --- SpType MK spectral type
18- 21 F4.2 mag B-V B-V colour index
23- 27 F5.2 mag VMAG Absolute V magnitude
29- 32 F4.2 [mW/m2] logSF log of the surface MgII-K flux
34- 38 F5.2 [Sun] [Fe/H] ?=- Metallicity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 30-Jun-2006