J/A+A/483/903 Mount Wilson index for main sequence F-K stars (Buccino+, 2008)
Mg II lines as stellar activity indicators of main sequence F-K stars.
Buccino A.P., Mauas P.J.D.
<Astron. Astrophys. 483, 903 (2008)>
=2008A&A...483..903B 2008A&A...483..903B
ADC_Keywords: Stars, dwarfs ; Stars, late-type ; Spectra, ultraviolet
Keywords: standards - line: profiles - astronomical data bases: miscellaneous -
instrumentation: spectrographs - stars: activity - ultraviolet: stars
Abstract:
The largest dataset of stellar activity measurements available at
present is the one obtained at the Mount Wilson Observatory, where
high-precision CaII H+K fluxes have been measured from 1966 for about
2200 stars. Since the MgII H and K lines at λ2800Å are
formed in a similar way to the CaII H+K emission lines, they are also
good indicators of chromospheric structure. The International
Ultraviolet Explorer (IUE) provides a large database of UV spectra in
the band 1150-3350Å from 1978 to 1995, which can also be used to
study stellar activity.
The main purpose of this study is to use the IUE spectra in the
analysis of magnetic activity of main sequence F-K stars. Combining
IUE observations of MgII and optical spectroscopy of CaII, the
registry of activity of stars can be extended in time.
Description:
The Mount Wilson index derived from all the high resolution spectra of
F, G and K main sequence stars observed by the IUE satellite.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 67 1624 Mount Wilson chromospheric activity indices
(on 260 different stars)
--------------------------------------------------------------------------------
See also:
VI/110 : Final Merged Log of IUE Observations (NASA-ESA, 2000)
I/239 : The Hipparcos and Tycho Catalogues (ESA 1997)
J/A+A/469/309 : Chromospheric activity in late-type stars (Cincunegui+, 2007)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- HD HD star number
8- 12 F5.2 mag Vmag Visual magnitude (1)
14- 18 F5.3 mag B-V B-V color index (1)
20- 25 F6.2 mas Plx Parallax (1)
27- 37 F11.3 d JD Julian date of observation
39- 45 F7.2 yr Obs Year of observation
47- 51 F5.3 --- S Mount Wilson activity index
53- 58 F6.4 --- e_S Mount Wilson activity index standard deviation
60- 67 A8 --- IUEsp IUE spectrum
--------------------------------------------------------------------------------
Note (1): Quantities obtained from Hipparcos and Tycho catalogue (Cat. I/239)
--------------------------------------------------------------------------------
Acknowledgements:
Andrea Buccino, abuccino(at)iafe.uba.ar
(End) Patricia Vannier [CDS] 01-Apr-2008