2001A&A...369..862K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST14:10:04

2001A&A...369..862K - Astronomy and Astrophysics, volume 369, 862-870 (2001/4-3)

Variable stars in the globular cluster M 92.

KOPACKI G.

Abstract (from CDS):

Result. of a search for variable stars in the central region of the Oosterhoff II type globular cluster M 92 are presented. Out of the 28 variable and suspected variable stars listed in the Catalogue of Variable Stars in Globular Clusters (Clement, 1997, Cat. V/97) only two were not observed. Surprisingly, almost half of the observed suspected variables did not show any evidence of variability. Only one out of the 11 candidate RR Lyrae variables of Kadla et al. (1983PZ.....21..827K) appeared to be variable. Moreover, variable v7, until now classified as an RR Lyrae star with a period of about 0.515d, turned out to be of the BL Herculis type, with the period approximately twice that long. In addition, six new variables were found in the very core of the cluster: four of the RR Lyrae and the remaining two of the SX Phoenicis type. RRc variable v11 shows changes in the light curve shape. Due to the aliasing problems, however, we can state only that this star is biperiodic. There is a possibility that v11 belongs to the new group of recently discovered double-period RRc variables pulsating in non-radial mode. Altogether, light curves were obtained for 20 variable stars. The total number of known RR Lyrae stars in M 92 equals now 17, 11 of type RRab and the remaining 6, RRc. The mean period of RRab variables amounts to 0.63±0.05d, while the average period for RRc variables is equal to 0.36±0.05d. Mean V magnitudes, mean V-IC colours, and ranges of variations were derived for 12 RR Lyrae stars and the BL Herculis variable. Period-shift analysis for M 92 and M 2 resulted in finding that despite significant difference in metal abundance between these two clusters ([Fe/H]=-2.24 for M 92 and -1.62 for M 2), there is no firm evidence for a shift in period.

Abstract Copyright:

Journal keyword(s): stars: population II - stars: variables: RR Lyr - stars: variables: Cepheids - globular clusters: individual: M 92

VizieR on-line data: <Available at CDS (J/A+A/369/862): dao-i.dat dao-v.dat ism-i.dat ism-v.dat table1.dat>

Nomenclature: Table 1: Cl* NGC 6341 SAW VNN (Nos V29-V34) added.

CDS comments: Cl* NGC 6341 SAW VNN (Nos V16-V28) are added in the 4th edition of the CVSGC.

Simbad objects: 25

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Number of rows : 25

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 M 53 GlC 13 12 55.25 +18 10 05.4   8.95 7.79     ~ 713 0
2 Cl* NGC 6341 SAW V4 RR* 17 17 00.3686115847 +43 09 08.914859628       15.03   ~ 16 0
3 Cl* NGC 6341 SAW V33 SX* 17 17 03.85 +43 08 13.7     17.29   17.12 ~ 2 0
4 Cl* NGC 6341 SAW V32 RR* 17 17 04.6092078861 +43 08 42.037249532           ~ 1 0
5 Cl* NGC 6341 SAW V31 RR* 17 17 06.77 +43 08 27.3           ~ 2 0
6 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 1904 0
7 Cl* NGC 6341 SAW V30 RR* 17 17 07.53 +43 08 06.0           ~ 2 0
8 Cl* NGC 6341 SAW V7 cC* 17 17 07.6124625090 +43 07 21.382434459       14.49   ~ 11 0
9 Cl* NGC 6341 SAW V29 RR* 17 17 07.94 +43 08 02.8           ~ 2 0
10 Cl* NGC 6341 HAC 9 RR* 17 17 09.09 +43 07 24.2           ~ 6 0
11 Cl* NGC 6341 SAW V25 RR* 17 17 09.7290266526 +43 08 03.294848071           ~ 1 0
12 Cl* NGC 6341 SAW V34 SX* 17 17 09.95 +43 07 42.7     17.13   16.84 ~ 2 0
13 Cl* NGC 6341 HAC 12 RR* 17 17 10.2438371999 +43 06 34.590925655   15.28 14.06     ~ 7 0
14 Cl* NGC 6341 HAC 6 RR* 17 17 10.8870530272 +43 08 55.707312449     15.45     ~ 10 0
15 Cl* NGC 6341 HAC 3 RR* 17 17 11.9965859039 +43 12 25.248397923   15.528 14.80     ~ 33 0
16 Cl* NGC 6341 HAC 11 RR* 17 17 13.9825455397 +43 07 05.740275815   15.39 14.99     ~ 9 0
17 Cl* NGC 6341 SAW V5 RR* 17 17 14.9004787530 +43 07 19.334764600       15.02   ~ 17 0
18 Cl* NGC 6341 HAC 10 RR* 17 17 14.9305211155 +43 08 49.380545359   15.465 15.132     ~ 13 0
19 Cl* NGC 6341 HAC 2 RR* 17 17 15.6392303305 +43 09 22.265369794   15.552 14.67     ~ 17 0
20 Cl* NGC 6341 HAC 1 RR* 17 17 18.9874146318 +43 08 54.888465165   15.489 14.40     ~ 34 0
21 Cl* NGC 6341 HAC 13 RR* 17 17 21.4716360602 +43 07 13.824446582   15.33 15.12     ~ 7 0
22 Cl* NGC 6341 HAC 8 RR* 17 17 26.2415585818 +43 11 42.555932656   15.504 15.137     ~ 15 0
23 NGC 6362 GlC 17 31 54.99 -67 02 54.0   9.72 8.86     ~ 487 0
24 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 758 0
25 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 899 1

    Equat.    Gal    SGal    Ecl

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2020.07.02-14:10:04

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