2013A&A...553A.111S

Query : 2013A&A...553A.111S

2013A&A...553A.111S - Astronomy and Astrophysics, volume 553A111-111 (2013/5-1)

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. and WILLIAMS A.

Abstract (from CDS):

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 1.54 m 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.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: NGC 6981 - stars: variables: RR Lyrae - instrumentation: high angular resolution - stars: variables: general

VizieR on-line data: <Available at CDS (J/A+A/553/A111): photom.dat>

Nomenclature: Fig. 1, Table 1: Cl* NGC 6981 Saw VNN (Nos V57-V58) added.

Errata: + corrigendum vol. 558, p. C1

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Cl* NGC 6981 SAW V58 V* 20 53 27.12 -12 32 13.9           ~ 3 0
2 Cl* NGC 6981 SAW V57 RR* 20 53 27.3467610741 -12 32 13.213780315   17.02 16.63   16.06 ~ 5 0
3 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
4 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
5 NAME Galactic Bulge reg ~ ~           ~ 4794 0

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