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J/AJ/135/1459       Period of M15 variable stars             (Corwin+, 2008)

The globular cluster M15. I. Identification, discovery, and period determination of variable stars. Corwin T.M., Borissova J., Stetson P.B., Catelan M., Smith H.A., Kurtev R., Stephens A.W. <Astron. J., 135, 1459-1473 (2008)> =2008AJ....135.1459C
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, UBVRI Keywords: globular clusters: individual (M15) - stars: evolution - stars: variables: other Abstract: We present new BVI CCD photometry for variables in the globular cluster M15. Our photometry was obtained using both the image subtraction package ISIS and DAOPHOT/ALLFRAME. The data were acquired in 2001 on two observing runs on 11 observing nights using the 2m telescope of the Bulgarian National Astronomical Observatory "Rozhen" with a Photometrics CCD camera. For 39 previously known variables, we present a period for the first time, and improved periods were obtained for many previously known variables. Fourteen new variables are reported. We present updated Bailey diagrams for the cluster, and discuss its Oosterhoff classification. Although many of M15's RRab pulsators fall at an intermediate locus between Oosterhoff types I and II (OoII) in the Bailey diagram, we argue that M15 is indeed a bona fide OoII globular cluster. Description: Time-series photometry was obtained during the interval 2001 July 13 to 2001 July 19 with the 2m Ritchey-Chretien telescope of the Bulgarian National Astronomical Observatory "Rozhen" with a Photometrics CCD camera. This represents almost all of our data. During the interval 2001 September 18 to 2001 September 25, using the same telescope and instrument, a few additional images were obtained. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 65 148 M15 variables, new periods table2.dat 45 98 M15 variables, positions relative to cluster center table3.dat 67 111 M15 variables, VBI photometry
See also: J/AJ/110/704 : RR Lyrae Variables in M15 (Silbermann+ 1995) J/AJ/124/3255 : UBV photometry in M15 (van der Marel+, 2002) J/other/RMxAA/42.75 : M15 RR Lyrae CCD RV light curve (Arellano Ferro+, 2006) J/ApJ/670/379 : UV photometry of M15 (Dieball+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Variable name (G1) 7- 8 I2 h RAh Right ascension (J2000) 10- 11 I2 min RAm Right ascension (J2000) 13- 17 F5.2 s RAs Right ascension (J2000) 19 A1 --- DE- Declination sign (J2000) 20- 21 I2 deg DEd Declination (J2000) 23- 24 I2 arcmin DEm Declination (J2000) 26- 29 F4.1 arcsec DEs Declination (J2000) 31- 40 F10.7 d Per.p ? Previous period 42- 50 F9.7 d Per ? Our period 51 A1 --- u_Per [?] Uncertainty flag on Per 53- 58 A6 --- Type Variable type 61 A1 --- --- [=] 62- 65 A4 --- OName Other name (VNNN)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Variable name (G1) 7- 12 F6.2 arcsec Xpos.p Previous X position 14- 20 F7.2 arcsec Ypos.p Previous Y position 22- 27 F6.2 arcsec Xpos Our X position 29- 35 F7.2 arcsec Ypos Our Y position 37- 40 A4 --- OName Other name (VNNN, ZKNN, Phe) 42- 45 F4.2 arcsec Diff Difference
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Name Variable name (G1) 6 A1 --- --- [=] 7- 10 A4 --- OName Other name (ZKNN) 12- 17 F6.3 mag <Vmag> ? Mean V magnitude 19- 24 F6.3 mag <Vint> ? Intensity-averaged V magnitude 26- 29 F4.2 mag Vamp ? Amplitude in V band 31- 36 F6.3 mag <Bmag> ? Mean B magnitude 38- 43 F6.3 mag <Bint> ? Intensity-averaged B magnitude 45- 48 F4.2 mag Bamp ? Amplitude in B band 50- 55 F6.3 mag <Imag> ? Mean I magnitude 57- 62 F6.3 mag <Iint> ? Intensity-averaged I magnitude 64- 67 F4.2 mag Iamp ? Amplitude in I band
Global notes: Note (G1): Variable identified in Simbad as : <Cl* NGC 7078 SAW VNNN> for VNNN, <Cl* NGC 7078 ZK NN> for ZK NN, <Cl* NGC 7078 CBS NN> for NVNN.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2010
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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