Access to Astronomical Catalogues

← Click to display the menu
J/A+A/553/A111      Light curves of two NGC6981 variables     (Skottfelt+, 2013)

EMCCD photometry reveals two new variable stars in the crowded central region of the globular cluster NGC 6981. Skottfelt J., Bramich D.M., Figuera Jaimes R., Jorgensen U.G., Kains N., Harpsoe K.B.W., Liebig C., Penny M.T., Alsubai K.A., Andersen J.M., Bozza V., Browne P., Calchi Novati S., Damerdji Y., Diehl C., Dominik M., Elyiv A., Giannini E., Hessman F., Hinse T.C., Hundertmark M., Juncher D., Kerins E., Korhonen H., Mancini L., Martin R., Rabus M., Rahvar S., Scarpetta G., Southworth J., Snodgrass C., Street R.A., Surdej J., Tregloan-Reed J., Vilela C., Williams A. <Astron. Astrophys., 553, A111 (2013)> =2013A&A...553A.111S
ADC_Keywords: Clusters, globular ; Stars, variable ; Photometry, CCD Keywords: globular clusters: individual: NGC 6981 - stars: variables: RR Lyrae - instrumentation: high angular resolution - stars: variables: general Abstract: Two previously unknown variable stars in the crowded central region of the globular cluster NGC 6981 are presented. The observations were made using the electron multiplying CCD (EMCCD) camera at the Danish 1.54m Telescope at La Silla, Chile. The two variables were not previously detected by conventional CCD imaging because of their proximity to a bright star. This discovery demonstrates that EMCCDs are a powerful tool for performing high-precision time-series photometry in crowded fields and near bright stars, especially when combined with difference image analysis. Description: EMCCD time-series i+z photometry for the new variables V57 and V58 in NGC 6981. Objects: ----------------------------------------------------------------- RA (2000) DE Designation(s) (Per) ----------------------------------------------------------------- 20 53 27.38 -12 32 13.3 V57 = Cl* NGC 6981 SAW V57 (P=0.334) 20 53 27.12 -12 32 13.9 V58 = Cl* NGC 6981 SAW V58 (P=0.285) ----------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file photom.dat 39 250 EMCCD time-series i+z photometry for the new variables V57 and V58 in NGC 6981
See also: J/MNRAS/413/1275 : VrI light curves of NGC6981 variables (Bramich+, 2011) Byte-by-byte Description of file: photom.dat
Bytes Format Units Label Explanations
1- 3 A3 --- VName [V57 V58] Variable star ID 5- 7 A3 --- Filter [i+z] Observation filter (1) 9- 21 F13.5 d HJD Heliocentric Julian date at mid-exposure 23- 31 F9.3 s-1 DFlux Difference flux (in ADU/s unit) 33- 39 F7.3 s-1 e_DFlux Difference flux uncertainty (in ADU/s unit)
Note (1): The filter i+z represents the EMCCD imager passband which roughly corresponds to the combination of the SDSS i and z filters.
Acknowledgements: Jesper Skottfelt, skottfelt(at)astro.ku.dk Daniel Bramich, dan.bramich(at)hotmail.co.uk
(End) Daniel Bramich [ESO, Germany], Patricia Vannier [CDS] 10-Oct-2013
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

© UDS/CNRS

Contact