2001A&A...367..148P

Query : 2001A&A...367..148P

2001A&A...367..148P - Astronomy and Astrophysics, volume 367, 148-158 (2001/2-3)

Cluster AgeS Experiment. CCD photometry of SX Phoenicis variables in the globular cluster M 55.

PYCH W., KALUZNY J., KRZEMINSKI W., SCHWARZENBERG-CZERNY A. and THOMPSON I.B.

Abstract (from CDS):

We present CCD photometry of SX Phe variables in the field of the globular cluster M 55. We have discovered 27 variables, three of which are probable members of the Sagittarius dwarf galaxy. All of the SX Phe stars in M 55 lie in the blue straggler region of the cluster color-magnitude diagram. Using period ratio information we have identified the radial pulsation modes for one of the observed variables. Inspection of the period-luminosity distribution permits the probable identifications of the pulsation modes for most of the rest of the stars in the sample. We have determined the slope of the period-luminosity relation for SX Phe stars in M 55 pulsating in the fundamental mode. Using this relation and the HIPPARCOS data for SX Phe itself, we have estimated the apparent distance modulus to M 55 to be (m-M)V=13.86±0.25mag.

Abstract Copyright: ∼

Journal keyword(s): globular clusters: individual: M 55 - (stars): blue stragglers: stars: variables: δ Sct - stars: oscillations - stars: population II

Nomenclature: Tables 1, 3: Cl* NGC 6809 Saw VNN (Nos V16-V42) added.

Simbad objects: 29

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Number of rows : 29
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 Cl* NGC 6809 SAW V30 V* 19 39 41.02 -30 50 25.2   20.68 20.35     ~ 3 0
2 Cl* NGC 6809 SAW V29 V* 19 39 42.58 -30 55 58.3   20.92 20.71     ~ 4 0
3 Cl* NGC 6809 MFRBS 57 SX* 19 39 45.49 -30 56 02.7   17.40 17.06     ~ 9 0
4 Cl* NGC 6809 MFRBS 63 SX* 19 39 47.10 -30 57 33.0   16.51 16.11     ~ 8 0
5 Cl* NGC 6809 MFRBS 53 SX* 19 39 48.56 -30 56 45.0   17.05 16.74     ~ 8 0
6 Cl* NGC 6809 MFRBS 55 SX* 19 39 49.87 -30 57 42.5   17.26 16.96     ~ 8 0
7 Cl* NGC 6809 MFRBS 52 SX* 19 39 50.39 -30 55 12.1   16.91 16.57     ~ 9 0
8 Cl* NGC 6809 MFRBS 50 SX* 19 39 51.55 -30 56 21.3   16.21 15.88     ~ 8 0
9 Cl* NGC 6809 MFRBS 62 SX* 19 39 51.76 -30 55 53.6   17.55 17.23     ~ 8 0
10 Cl* NGC 6809 MFRBS 24 SX* 19 39 54.11 -30 58 06.0   17.47 17.13     ~ 9 0
11 Cl* NGC 6809 MFRBS 51 SX* 19 39 54.56 -30 59 57.9   16.73 16.40     ~ 9 0
12 Cl* NGC 6809 MFRBS 23 SX* 19 39 54.95 -30 58 21.2   17.36 17.02     ~ 9 0
13 Cl* NGC 6809 MFRBS S12 SX* 19 39 57.67 -30 57 01.3   17.64 17.33     ~ 9 0
14 Cl* NGC 6809 MFRBS 21 SX* 19 39 58.14 -30 58 32.7   17.27 16.95     ~ 9 0
15 Cl* NGC 6809 MFRBS 26 SX* 19 39 58.27 -30 59 06.1   16.21 15.78     ~ 8 0
16 Cl* NGC 6809 MFRBS 25 SX* 19 39 58.61 -30 57 23.9   17.42 17.18     ~ 8 0
17 Cl* NGC 6809 MFRBS 20 SX* 19 39 58.88 -30 58 15.6   17.11 16.71     ~ 10 0
18 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 854 0
19 Cl* NGC 6809 MFRBS 11 SX* 19 40 00.99 -30 57 56.5   17.63 17.28     ~ 10 0
20 Cl* NGC 6809 MFRBS 61 SX* 19 40 01.02 -31 00 37.9   17.54 17.24     ~ 8 0
21 Cl* NGC 6809 MFRBS 60 SX* 19 40 01.90 -30 55 38.2   17.54 17.22     ~ 9 0
22 Cl* NGC 6809 MFRBS 10 SX* 19 40 02.95 -30 58 28.3   16.83 16.54     ~ 10 0
23 Cl* NGC 6809 MFRBS 22 SX* 19 40 06.87 -30 56 33.7   17.32 17.00     ~ 9 0
24 Cl* NGC 6809 MFRBS 54 SX* 19 40 07.80 -31 00 12.6   17.11 16.81     ~ 8 0
25 Cl* NGC 6809 MFRBS 56 SX* 19 40 09.20 -30 56 42.0   17.33 16.97     ~ 9 0
26 Cl* NGC 6809 MFRBS 58 SX* 19 40 11.33 -30 59 25.1   17.52 17.19     ~ 8 0
27 Cl* NGC 6809 MFRBS 59 SX* 19 40 11.9920245336 -31 02 05.420166684   17.50 17.21     ~ 7 0
28 Cl* NGC 6809 SAW V28 V* 19 40 15.04 -31 05 15.0   20.92 20.61     ~ 3 0
29 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.54 7.31     A3V 341 0

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