J/A+A/397/147 Activity-rotation relationship in stars (Pizzolato+ 2003)
The stellar activity-rotation relationship revisited: Dependence of saturated
and non-saturated X-ray emission regimes on stellar mass for late-type dwarfs.
Pizzolato N., Maggio A., Micela G., Sciortino S., Ventura P.
<Astron. Astrophys. 397, 147 (2003)>
=2003A&A...397..147P 2003A&A...397..147P
ADC_Keywords: Stars, late-type ; X-ray sources ; Photometry, UBV
Keywords: stars: activity - stars: late-type - X-rays: stars
Abstract:
We present the results of a new study on the relationship between
coronal X-ray emission and stellar rotation in late-type main-sequence
stars. We have selected a sample of 259 dwarfs in the B-V range
0.5-2.0, including 110 field stars and 149 members of the Pleiades,
Hyades, α Persei, IC 2602 and IC 2391 open clusters. All the
stars have been observed with ROSAT, and most of them have
photometrically-measured rotation periods available. Our results
confirm that two emission regimes exist, one in which the rotation
period is a good predictor of the total X-ray luminosity, and the
other in which a constant saturated X-ray to bolometric luminosity
ratio is attained; we present a quantitative estimate of the critical
rotation periods below which stars of different masses (or spectral
types) enter the saturated regime.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
stars.dat 61 258 Star positions (from Simbad)
table1.dat 61 110 Field dwarf sample
table2.dat 68 149 Cluster stars: Pleiades, IC 2602, IC 2391,
α Persei and Hyades
refs.dat 85 28 References
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See also:
J/A+A/341/751 : ROSAT HRI observations of the Pleiades (Micela+ 1999)
Byte-by-byte Description of file: stars.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Star name
18- 19 I2 h RAh Right ascension (J2000.0)
21- 22 I2 min RAm Right ascension (J2000.0)
24- 27 F4.1 s RAs Right ascension (J2000.0)
29 A1 --- DE- Declination sign (J2000.0)
30- 31 I2 deg DEd Declination (J2000.0)
33- 34 I2 arcmin DEm Declination (J2000.0)
36- 37 I2 arcsec DEs Declination (J2000.0)
41- 61 A21 --- SName Simbad designation
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Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Name
12- 16 F5.2 pc Dist ? Distance
18- 21 F4.2 mag B-V B-V colour index
23- 28 F6.2 mag Vmag V magnitude
31 A1 --- l_Per Limit flag on Per
32- 36 F5.2 d Per Period
38- 39 A2 --- r_Per Reference for the period, in refs.dat file
42- 46 F5.2 [10-7W] logLX X-ray luminosity
48- 49 A2 --- r_logLX Reference for X-ray luminosity,
in refs.dat file
52- 56 F5.2 [---] logLX/Lbol Bolometric-to-X-ray luminosity ratio
58- 61 F4.2 solMass Mass Mass
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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- 12 A12 --- Cluster Cluster name
14- 23 A10 --- Name Name
25- 27 I3 pc Dist ? Distance
29- 32 F4.2 mag B-V B-V colour index
35- 39 F5.2 mag Vmag V magnitude
41- 45 F5.2 d Per Period
47- 48 I2 --- r_Per Reference for the period, in refs.dat file
50- 54 F5.2 [10-7W] logLX X-ray luminosity
56- 57 I2 --- r_logLX Reference for X-ray luminosity,
in refs.dat file
59- 63 F5.2 [---] logLX/Lbol Bolometric-to-X-ray luminosity ratio
65- 68 F4.2 solMass Mass Mass
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- Ref Reference code
4- 22 A19 --- BibCode BibCode
24- 43 A20 --- Aut author's name
47- 86 A40 --- Com Comments
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History:
From electronic version of the journal
(End) Patricia Bauer [CDS] 25-Mar-2003