J/A+A/374/1085 Mg II K line Wilson-Bappu relationship (Cassatella+, 2001)
On the Wilson-Bappu relationship in the Mg II K line
Cassatella A., Altamore A., Badiali M., Cardini D.
<Astron. Astrophys. 374, 1085 (2001)>
=2001A&A...374.1085C 2001A&A...374.1085C
ADC_Keywords: Stars, distances ; Line Profiles ; Ultraviolet
Keywords: stars: distances - stars: late-type - ultraviolet general -
line: profiles - catalogue
Abstract:
An investigation is carried out on the Wilson-Bappu effect in the
MgII K line at 2796.34Å. The work is based on a selection of 230
stars observed by both the IUE and HIPPARCOS satellites, covering a
wide range of spectral types (F to M) and absolute visual magnitudes
(-5.4≤MV≤9.0). A semi-automatic procedure is used to measure the
line widths, which applies also in the presence of strong central
absorption reversal. The Wilson-Bappu relationship here provided is
considered to represent an improvement over previous recent results
for the considerably larger data sample used, as well as for a proper
consideration of the measurement errors. No evidence has been found
for a possible dependence of the WB effect on stellar metallicity and
effective temperature.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea.dat 75 303 On the Wilson-Bappu relationship in the Mg II K
line: the final data base
tablea.tex 127 389 LaTeX version of tablea.dat
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See also:
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
Byte-by-byte Description of file: tablea.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HIP Hipparcos (Cat. I/239) number
8 A1 --- n_B-V [*] B-V flag (blank if B-V value from
Hipparcos, '*' else)
10- 18 A9 --- Name HD or other identifier
20- 31 A12 --- SpType Spectral type and luminosity class
33- 38 F6.3 mag VMAG Absolute V magnitude (1)
40- 44 F5.3 mag e_VMAG rms uncertainty on VMAG (1)
46- 50 F5.3 mag B-V B-V colour index
52- 55 F4.3 mag e_B-V rms uncertainty on B-V
57- 64 A8 --- IUE IUE Image
66- 70 F5.3 [km/s] logW0 logarithm of width half-maximum of the
Mg II K line (2)
72- 75 F4.3 [km/s] e_logW0 rms uncertainty on logW0
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Note (1): The absolute magnitudes were computed without any allowance for
interstellar reddening. The errors have been derived from the errors
in trigonometric parallaxes assuming a typical error of 0.01mag in the
observed visual magnitudes.
Note (2): Full width half maximum after quadratic subtraction of instrumental
width b: W02 = W2 - b2
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Acknowledgements: Daniela Cardini
History : 3 names corrected on 30-Aug-2001
(End) Patricia Bauer [CDS] 19-Jun-2001