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J/MNRAS/405/1711    VRIg'i' photometry of 7 M15 giants       (McDonald+, 2010)

Discovery of long-period variable stars in the very metal-poor globular cluster M15. McDonald I., van Loon J.T., Dupree A.K., Boyer M.L. <Mon. Not. R. Astron. Soc., 405, 1711-1722 (2010)> =2010MNRAS.405.1711M
ADC_Keywords: Clusters, globular ; Stars, giant ; Photometry, VRI ; Photometry, SDSS Keywords: stars: AGB and post-AGB - stars: late-type - stars: Population II - stars: variables: general - stars: winds, outflows - globular clusters: individual: M15 Abstract: We present a search for long-period variable (LPV) stars among giant branch stars in M15 which, at [Fe/H]~-2.3, is one of the most metal-poor Galactic globular clusters. We use multicolour optical photometry from the 0.6-m Keele Thornton and 2-m Liverpool Telescopes. Variability of δV∼0.15mag is detected in K757 and K825 over unusually long time-scales of nearly a year, making them the most metal-poor LPVs found in a Galactic globular cluster. K825 is placed on the long secondary period sequence, identified for metal-rich LPVs, though no primary period is detectable. We discuss this variability in the context of dust production and stellar evolution at low metallicity, using additional spectra from the 6.5-m Magellan (Las Campanas) telescope. A lack of dust production, despite the presence of gaseous mass loss raises questions about the production of dust and the intracluster medium of this cluster. Description: The first data set for this work comes from the 2-m Liverpool Telescope, situated on La Palma. A total of 38 observation blocks were taken, spanning 462d, from 2007 April 23 to 2008 July 27. A gap is present between 2007 December 04 and 2008 April 23 when the cluster was viewed in too close proximity to the Sun. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file stars.dat 80 7 Candidate variable giant stars in M15 from Mosley & White (1975BAAS....7..535M) with tablea1.dat 55 169 Difference photometry of comparison stars with variable stars in data from Keele Thornton Telescope (VRI observations) tablea2.dat 55 71 Difference photometry of comparison stars with variable stars in data from Liverpool Telescope (g'i' observations)
Byte-by-byte Description of file: stars.dat
Bytes Format Units Label Explanations
1- 4 A4 --- Name Name (from Mosley & White 1975BAAS....7..535M) 6- 11 A6 --- Arp Arp designation (1955AJ.....60..317A, Cl* NGC 7078 ARP A-NNN) 13- 15 I3 --- Buo ? Buonanno et al, 1983A&AS...51...83B number (Cl* NGC 7078 BBFP NNN) 17- 18 A2 --- San Sandage, 1970ApJ...162..841S designation (Cl* NGC 7078 SANDA SN) 20- 21 I2 h RAh Right ascension (J2000) 23- 24 I2 min RAm Right ascension (J2000) 26- 30 F5.2 s RAs Right ascension (J2000) 32 A1 --- DE- Declination sign (J2000) 33- 34 I2 deg DEd Declination (J2000) 36- 37 I2 arcmin DEm Declination (J2000) 39- 42 F4.1 arcsec DEs Declination (J2000) 44 A1 --- l_Mm [~] Limit flag on Mm 45- 46 I2 % Mm Membership probability 48- 54 F7.2 km/s HRV ? Heliocentric radial velocities 56- 60 F5.2 mag Vmag V magnitude 62- 65 F4.2 mag B-V B-V colour index 67- 71 A5 --- Var? Variability found ? 73 A1 --- l_Per [~] Limit flag on Per 74- 76 I3 d Per ? Period 78- 79 I2 d e_Per ? rms uncertainty on Per 80 A1 --- u_Per [?] Uncertainty flag on Per
Byte-by-byte Description of file: tablea1.dat tablea2.dat
Bytes Format Units Label Explanations
1- 2 A2 --- Band [VRI g'i'] Observed band 4- 13 F10.2 d JD Julian date 15- 19 F5.3 mag K169mag Apparent magnitude in Band for K169 21- 25 F5.3 mag K825mag Apparent magnitude in Band for K825 27- 31 F5.3 mag K134mag Apparent magnitude in Band for K134 33- 37 F5.3 mag K147mag ?=- Apparent magnitude in Band for K147 39- 43 F5.3 mag K757mag Apparent magnitude in Band for K757 45- 49 F5.3 mag K288mag ?=- Apparent magnitude in Band for K288 51- 55 F5.3 mag K709mag ? Apparent magnitude in Band for K709 (1)
Note (1): No i' g' data for K709.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 10-Dec-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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