IIA Institutional Repository

A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry

Show simple item record

dc.contributor.author Arellano Ferro, A
dc.contributor.author Bramich, D. M
dc.contributor.author Jaimes, R. F
dc.contributor.author Giridhar, S
dc.contributor.author Kains, N
dc.contributor.author Kuppuswamy, K
dc.contributor.author Jorgensen, U. G
dc.contributor.author Alsubai, K. A
dc.contributor.author Andersen, J. M
dc.contributor.author Bozza, V
dc.contributor.author Browne, P
dc.contributor.author Novati, S. C
dc.contributor.author Damerdji, Y
dc.contributor.author Diehl, C
dc.contributor.author Dominik, M
dc.contributor.author Dreizler, S
dc.contributor.author Elyiv, A
dc.contributor.author Giannini, E
dc.contributor.author Harpsoe, K
dc.contributor.author Hessman, F. V
dc.contributor.author Hinse, T. C
dc.contributor.author Hundertmark, M
dc.contributor.author Juncher, D
dc.contributor.author Kerins, E
dc.contributor.author Korhonen, H
dc.contributor.author Liebig, C
dc.contributor.author Mancini, L
dc.contributor.author Mathiasen, M
dc.contributor.author Penny, M. T
dc.contributor.author Rabus, M
dc.contributor.author Rahvar, S
dc.contributor.author Ricci, D
dc.contributor.author Scarpetta, G
dc.contributor.author Skottfelt, J
dc.contributor.author Snodgrass, C
dc.contributor.author Southworth, J
dc.contributor.author Surdej, J
dc.contributor.author Tregloan-Reed, J
dc.contributor.author Vilela, C
dc.contributor.author Wertz, O
dc.date.accessioned 2013-07-30T13:39:34Z
dc.date.available 2013-07-30T13:39:34Z
dc.date.issued 2013-09-11
dc.identifier.citation Monthly Notices of the Royal Astronomical Society, Vol. 434, No. 2, pp. 1220-1238 en
dc.identifier.issn 1365-2966
dc.identifier.uri http://hdl.handle.net/2248/6211
dc.description Restricted Access en
dc.description.abstract We report CCD V and I time series photometry of the globular cluster NGC 6333 (M9). The technique of difference image analysis has been used, which enables photometric precision better than 0.05 mag for stars brighter than V ∼ 19.0 mag, even in the crowded central regions of the cluster. The high photometric precision has resulted in the discovery of two new RRc stars, three eclipsing binaries, seven long-term variables and one field RRab star behind the cluster. A detailed identification chart and equatorial coordinates are given for all the variable stars in the field of our images of the cluster. Our data together with the literature V-data obtained in 1994 and 1995 allowed us to refine considerably the periods for all RR Lyrae stars. The nature of the new variables is discussed. We argue that variable V12 is a cluster member and an Anomalous Cepheid. Secular period variations, double-mode pulsations and/or the Blazhko-like modulations in some RRc variables are addressed. Through the light-curve Fourier decomposition of 12 RR Lyrae stars we have calculated a mean metallicity of [Fe/H]ZW = −1.70 ± 0.01(statistical) ± 0.14(systematic) or [Fe/H]UVES=−1.67 ± 0.01 (statistical) ± 0.19 (systematic). Absolute magnitudes, radii and masses are also estimated for the RR Lyrae stars. A detailed search for SX Phe stars in the Blue Straggler region was conducted but none were discovered. If SX Phe exist in the cluster then their amplitudes must be smaller than the detection limit of our photometry. The colour–magnitude diagram has been corrected for heavy differential reddening using the detailed extinction map of the cluster of Alonso-García et al. This has allowed us to set the mean cluster distance from two independent estimates; from the RRab and RRc absolute magnitudes, we find 8.04 ± 0.19 and 7.88 ± 0.30 kpc, respectively. en
dc.language.iso en en
dc.publisher Oxford University Press on behalf of the Royal Astronomical Society en
dc.relation.uri http://dx.doi.org/10.1093/mnras/stt1080 en
dc.relation.uri http://arxiv.org/abs/1306.3206
dc.rights © Royal Astronomical Society en
dc.subject Stars: fundamental parameters en
dc.subject Globular clusters: individual: NGC 6333 en
dc.subject Stars: variables: general en
dc.subject Stars: variables: RR Lyrae en
dc.title A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry en
dc.type Article en

Files in this item

This item appears in the following Collection(s)

Show simple item record

Search DSpace


My Account