2003AJ....125.3165J

Query : 2003AJ....125.3165J

2003AJ....125.3165J - Astron. J., 125, 3165-3174 (2003/June-0)

New SX Phoenicis stars in the globular cluster M53.

JEON Y.-B., LEE M.G., KIM S.-L. and LEE H.

Abstract (from CDS):

Through time-series CCD photometry of the metal-poor globular cluster M53 we have discovered eight new SX Phoenicis-type stars (labeled ``SXP1'' to ``SXP8''). All the new SX Phoenicis stars are located in the blue straggler star region of the color-magnitude diagram of M53. One of these stars (SXP2) is found to have very closely separated pulsation frequencies: f1/f2=0.9595, where f1and f2are the primary and secondary frequencies, respectively. This may be due to excitation of nonradial modes. Six of these SX Phoenicis stars are considered to be pulsating in the fundamental mode. They show a tight linear correlation between the period and luminosity. We derive a period-luminosity relation for the fundamental mode for the period range of -1.36<logP(days)←1.15: <V>=-3.010(±0.262)logP+15.310(±0.048) with an rms scatter of 0.038, corresponding to <MV>=-3.010logP-1.070 for an adopted distance modulus of (m-M)V=16.38.

Abstract Copyright: ∼

Journal keyword(s): Stars: Blue Stragglers - Galaxy: Globular Clusters: Individual: Messier Number: M53 - Stars: Oscillations - Stars: Variables: Other

Nomenclature: Table 2: Cl* NGC 5024 SXP N (Nos 1-8).

Simbad objects: 20

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Number of rows : 20
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 Cl* NGC 104 DPF 1758 SX* 00 24 06.606 -72 04 49.47 16.13 16.25 15.93   15.55 ~ 12 0
3 GD 428 SX* 03 47 19.8773016336 +63 22 42.150015336   13.10   13.26   ~ 104 0
4 Cl* NGC 5024 SXP 2 SX* 13 12 49.71 +18 07 26.0   19.23 18.92 19.054   ~ 6 0
5 Cl* NGC 5024 SAW V90 SX* 13 12 52.77 +18 04 58.4   19.22 18.96     ~ 5 0
6 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
7 Cl* NGC 5024 SXP 3 SX* 13 13 01.92 +18 10 13.2   19.51 19.25 19.356   ~ 5 0
8 Cl* NGC 5024 SXP 1 SX* 13 13 03.38 +18 09 25.3   19.09 18.81 18.927   ~ 6 0
9 Cl* NGC 5024 SXP 7 SX* 13 13 05.01 +18 08 36.1   19.74 19.52 19.434   ~ 6 0
10 Cl* NGC 5024 SXP 5 SX* 13 13 08.15 +18 07 38.4   19.69 19.44 19.435   ~ 6 0
11 Cl* NGC 5024 SXP 6 SX* 13 13 09.44 +18 09 40.1   19.67 19.37 19.455   ~ 6 0
12 Cl* NGC 5024 SAW V88 SX* 13 13 19.09 +18 06 40.7   19.51 19.17     ~ 3 0
13 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
14 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
15 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
16 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
17 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
18 Cl* NGC 7078 SXP 1 SX* 21 29 39.39 +12 11 43.2   18.68 18.45     ~ 8 0
19 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
20 V* SX Phe SX* 23 46 32.8928138474 -41 34 54.769886474   7.54 7.31     A3V 348 0

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