Access to Astronomical Catalogues

← Click to display the menu
J/A+AS/120/127      UBVRI photometry of 7 dwarfs in Alpha Per (Bouvier 1996)

UBVRI photometric monitoring of 7 rapidly rotating late-type dwarfs in the Alpha Persei cluster Bouvier J. <Astron. Astrophys. Suppl. Ser. 120, 127 (1996)> =1996A&AS..120..127B
ADC_Keywords: Stars, dwarfs ; Photometry, UBVRI Keywords: stars: magnetic fields - stars: rotation - stars: activity - stars: late type - open clusters and associations: individual: Alpha Persei Description: The UBVRI light curves of 7 late-type dwarfs amongst the fastest rotators of the Alpha Per cluster (vsini≥140km/s) are presented. The shape of the light curves suggests that the photometric variations are most often dominated by a single group of cool spots located at intermediate or high latitude on the stellar surface. Assuming that starspots are good tracers of the stellar magnetic field, the smooth light curves indicate the existence of a large scale, slowly varying magnetic structure at the surface of these ultrafast rotators. For a description of the UBVRI photometric system, see e.g. GCPD/08 File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 44 7 List of stars table.dat 44 434 UBVRI photometry
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 5 A5 --- name Name of star in alpha Per (Mel 20), as in table 8- 9 I2 h RAh Right Ascension J2000 (hours) (1) 11- 12 I2 min RAm Right Ascension J2000 (minutes) (1) 14- 17 F4.1 s RAs Right Ascension J2000 (seconds) (1) 19 A1 --- DE- Declination J2000 (sign) (1) 20- 21 I2 deg DEd Declination J2000 (degrees) (1) 23- 24 I2 arcmin DEm Declination J2000 (minutes) (1) 26- 27 I2 arcsec DEs Declination J2000 (seconds) (1) 30- 34 F5.2 mag Vmag Mean visual magnitude (1) (1) 37- 44 A8 --- Vname Variable name (1)
Note (1): from Simbad data-base
Byte-by-byte Description of file: table.dat
Bytes Format Units Label Explanations
1- 5 A5 --- name Star name 7- 17 F11.3 d HJD Heliocentric Julian date 19- 30 E12.5 mag Mag Differential magnitude 32- 42 E11.5 mag e_Mag rms error on the magnitude 44 A1 --- Color [UBVRI] Filter
History: * 03-May-1996: first version * 24-Jan-2004: added the file "stars.dat" at CDS. Acknowledgements: Jerome Bouvier
(End) Patricia Bauer [CDS] 03-May-1996
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

catalogue service

© Unistra/CNRS