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J/A+A/410/671       X-ray emission in cool main sequence stars (Messina+, 2003)

Dependence of coronal X-ray emission on spot-induced brightness variations in cool main sequence stars. Messina S., Pizzolato N., Guinan E.F., Rodon M. <Astron. Astrophys. 410, 671 (2003)> =2003A&A...410..671M
ADC_Keywords: Stars, late-type ; X-ray sources ; Magnetic fields Keywords: stars: activity - stars: late-type - stars: magnetic fields - stars: starspots - X-rays: stars Abstract: The maximum amplitude Amax of spot-induced brightness variations from long-term V-band photometry and the ratio LX/Lbol between X-ray and bolometric luminosities are suitable indicators of the level of magnetic activity in the photosphere and in the corona of late-type stars, respectively. By using these activity indicators we investigate the dependence of coronal X-ray emission on the level of photospheric starspot activity in a homogeneous sample of low mass main-sequence field and cluster stars of different ages (IC 2602, IC 4665, IC 2391, α Per, Pleiades and Hyades). Objects: ----------------------------------------- RA (2000) DE Designation(s) ----------------------------------------- 10 44.3 -64 20 IC 2602 17 46.3 +05 43 IC 4665 08 40.2 -53 04 IC 2391 03 22.0 +48 37 alpha Per 03 47.0 +24 07 Pleiades 04 26.9 +15 52 Hyades ----------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 79 264 Photometry table2.dat 50 228 X-ray data refs.dat 161 93 References
See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999) V/80 : Low-Mass Stars Membership in Alpha Per Cluster (Prosser 1992) J/ApJS/91/625 : ROSAT survey of the Pleaides (Stauffer+ 1994) J/A+A/341/751 : ROSAT HRI observations of the Pleiades (Micela+ 1999) J/AJ/105/1441 : IC 4665 (Prosser 1993) J/ApJS/85/315 : F, G and K dwarf stars of the Pleiades (Soderblom+ 1993) J/ApJS/91/625 : ROSAT survey of the Pleaides (Stauffer+ 1994) J/A+AS/115/41 : UBV(RI) photometry of cool stars (Cutispoto+, 1996) J/A+AS/120/127 : UBVRI photometry of 7 dwarfs in Alpha Per (Bouvier 1996) J/A+A/335/183 : Pleiades low-mass stars rotational velocities (Queloz+ 1998) J/A+AS/127/207 : UBV(RI)c photometry of active stars. VII. (Cutispoto 1998) J/A+A/350/513 : V368 Cep UBVRI time series (Kahanpaa+, 1999) J/A+AS/138/87 : UBVRI photometry of EUV stellar sources (Cutispoto+ 1999) J/A+AS/140/29 : Photometric monitoring of late-type stars (Strassmeier+ 1999) J/A+A/364/205 : UBVy photometry of cool stars (Cutispoto+, 2000) J/A+AS/142/275 : Stellar-activity of late-type stars (Strassmeier+ 2000) J/A+A/367/910 : UBV(RI)c photometry of active stars. IX (Cutispoto+, 2001) J/A+A/393/225 : Starspot cycles of six young solar analogues (Messina+, 2002) J/A+A/394/505 : UBV photometry of LQ Hya (Berdyugina+, 2002) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Cluster Cluster to which the star belongs 10 A1 --- n_Name [*] *: Stars for which the unpublished Villanova photometry was used 12- 21 A10 --- Name Name in the catalogue 23- 31 A9 --- Oname Other name as variable star 33- 37 F5.2 mag Vmax Brightest V-band magnitude 40- 44 F5.2 mag B-V ?=99.00 B-V colour 46- 51 F6.3 d Per Rotational period 53- 57 F5.3 mag Amax Maximum V-band light curve amplitude 60- 62 A3 --- r_Per Reference for rotational period, in refs.dat file 65- 67 A3 --- r_Amax Reference for light curve amplitude, in refs.dat file 70- 71 I2 --- LC Number of light curve 74- 79 A6 --- Flag Star used to define the upper envelope (1)
Note (1): Flags: FS_fit means F-type star in the slow rotational regime GS_fit means G-type star in the slow rotational regime KS_fit means K-type star in the slow rotational regime GF_fit means G-type star in the fast rotational regime KF_fit means K-type star in the fast rotational regime M0_fit means M-type stars in upper envelope 2 M1_fit means M-type stars in upper envelope 1
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 A9 --- Cluster Cluster to which the star belongs 12- 21 A10 --- Name Name in the catalogue 24- 29 F6.3 [10-7W] logLX X-ray luminosity 33- 38 F6.3 --- logLX/Lbol X-to-bolometric luminosities ratio 42- 46 F5.3 --- e_logLX/Lbol Uncertainty on logLX/Lbol 48- 50 A3 --- r_logLX [a-h ] References for logLX, in refs.dat file
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 3 A3 --- Ref Reference number 5- 13 A9 --- Cluster Cluster to which the star belongs 15- 33 A19 --- BibCode BibCode 35- 61 A27 --- Aut Author's name 62-161 A100 --- Com Comments
Acknowledgements: Sergio Messina
(End) Patricia Bauer [CDS] 16-Oct-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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