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J/A+A/533/A70       New β Cep stars in NGC 637            (Handler+, 2011)

New beta Cephei stars in the young open cluster NGC 637. Handler G., Meingast S. <Astron. Astrophys. 533, A70 (2011)> =2011A&A...533A..70H
ADC_Keywords: Clusters, open ; Stars, early-type ; Photometry, CCD Keywords: stars: early-type - open clusters and associations: general - techniques: photometric - stars: oscillations - asteroseismology Abstract: Studying stellar pulsations in open clusters offers the possibility of performing ensemble asteroseismology. The reasonable assumption that the cluster members have the same age, distance, and overall metallicity aids in the seismic modelling process and tightly constrains it. Therefore it is important to identify open clusters with many pulsators. New pulsating stars of the beta Cephei type were searched for among the members of the open cluster NGC 637. Thirty-one hours of time-resolved V filter CCD photometry were obtained. The measurements confirmed two previously known variables, and revealed three new beta Cephei stars and one more candidate. All four pulsators have sufficiently large amplitudes for easy mode identification and are multiperiodic. With four certain pulsating members, NGC 637 is now among the open clusters that are richest in beta Cephei stars. It is thus an excellent target for ensemble asteroseismology, and to examine the differences between pulsating and apparently constant stars in the beta Cephei domain. Description: The time series photometry for all variable cluster members is presented. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 76 9 Stars list v001.dat 18 597 Light curves of NGC 637 WEBDA 1 v003.dat 18 599 Light curves of NGC 637 WEBDA 3 v004.dat 18 602 Light curves of NGC 637 WEBDA 4 v006.dat 18 599 Light curves of NGC 637 WEBDA 6 v007.dat 18 600 Light curves of NGC 637 WEBDA 7 v013.dat 18 404 Light curves of NGC 637 WEBDA 13 v033.dat 18 404 Light curves of NGC 637 WEBDA 33 v068.dat 18 601 Light curves of NGC 637 WEBDA 68 v138.dat 18 601 Light curves of NGC 637 WEBDA 138
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Star Star number 5- 6 I2 h RAh Right ascension (J2000) 8- 9 I2 min RAm Right ascension (J2000) 11- 15 F5.2 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 28 F5.2 arcsec DEs Declination (J2000) 30- 37 A8 --- FileName Name of the file with the light curve 39- 56 A18 --- SName Simbad name 61- 67 F7.5 d-1 f1 ? Main (dominant) frequency 70- 76 F7.5 d-1 f2 ? Secondary frequency
Byte-by-byte Description of file: v*.dat
Bytes Format Units Label Explanations
2- 10 F9.6 d Date Heliocentric Julian Date of mid exposure, HJD-2455560 12- 18 F7.4 mag Vmag Relative V magnitude
Acknowledgements: Gerald Handler, gerald(at)
(End) Patricia Vannier [CDS] 01-Aug-2011
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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